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Ios 按下UIButton时更改JSON数据链接

ios json uitableview

Ios 按下UIButton时更改JSON数据链接,ios,json,uitableview,Ios,Json,Uitableview,我有一个iPhone应用程序，将JSON解析为表视图，并在自定义单元格中显示数据。 我有三个不同的JSON文件，它们包含相同的结构，但数据不同。我还有三个不同的UIButton显示为同一页面上的选项卡栏，如下所示： #import "DEMOSecondViewController.h" #import "DEMONavigationController.h" #import "PostsObject.h" #import "AFNetworking.h" @interface DEMOSec

我有一个iPhone应用程序，将JSON解析为表视图，并在自定义单元格中显示数据。 我有三个不同的JSON文件，它们包含相同的结构，但数据不同。我还有三个不同的UIButton显示为同一页面上的选项卡栏，如下所示：

#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end

@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end

[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];

我有两个不同的按钮图像-一个是选中的，另一个是未选中的

我解析JSON文件的代码如下所示：

#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end

@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end

[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];
因此，当我点击Twitter按钮时，我想要
NSURL*url=[[NSURL alloc]initWithString:@”http://my-site.com/jsonfile.php?name=Name"];
将链接更改为其他链接。它类似于UISegmentControl，但却有UIButtons

这怎么可能


谢谢。
您只需为NSURL创建一个属性，就可以从所有类方法访问它。按如下方式修改代码：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


然后在viewDidLoad中：


url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];


然后为按钮创建操作：


// Facebook button example. Do the same for the other 2 buttons
- (IBAction)facebookButton:(id)sender {
    url = [NSURL URLWithString:@"yourNewUrl"];
    // Here you need to call again your AFNewtorking code (maybe put it in a sperate method instead of the viewDidLoad)
}



我希望我能很好地解释答案：）
您只需为NSURL创建一个属性，就可以从所有类方法访问它。按如下方式修改代码：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


然后在viewDidLoad中：


url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];


然后为按钮创建操作：


// Facebook button example. Do the same for the other 2 buttons
- (IBAction)facebookButton:(id)sender {
    url = [NSURL URLWithString:@"yourNewUrl"];
    // Here you need to call again your AFNewtorking code (maybe put it in a sperate method instead of the viewDidLoad)
}



我希望我能很好地解释答案：）
您只需为NSURL创建一个属性，就可以从所有类方法访问它。按如下方式修改代码：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


然后在viewDidLoad中：


url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];


然后为按钮创建操作：


// Facebook button example. Do the same for the other 2 buttons
- (IBAction)facebookButton:(id)sender {
    url = [NSURL URLWithString:@"yourNewUrl"];
    // Here you need to call again your AFNewtorking code (maybe put it in a sperate method instead of the viewDidLoad)
}



我希望我能很好地解释答案：）
您只需为NSURL创建一个属性，就可以从所有类方法访问它。按如下方式修改代码：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


然后在viewDidLoad中：


url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];


然后为按钮创建操作：


// Facebook button example. Do the same for the other 2 buttons
- (IBAction)facebookButton:(id)sender {
    url = [NSURL URLWithString:@"yourNewUrl"];
    // Here you need to call again your AFNewtorking code (maybe put it in a sperate method instead of the viewDidLoad)
}



我希望我能很好地解释答案：）
首先连接到属性选项卡上的3个UIButton，我称它们为示例：


btnFaceBook 
btnTwitter
btnTwitter2


在-viewDidLoad中为3个UIButtons设置该选项卡的URL，如下所示：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


为3个UI按钮设置未按下和按下的图像，
您可以通过nib文件或类似的编程方式执行此操作：


[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2UnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2PressedSelected.png"] forState:UIControlStateSelected];


然后将所有3个UIButton的TouchUpInside操作连接到此方法：


- (IBAction)btnFromTabBarClicked:(UIButton *)sender
{
    //Unselect all 3 buttons
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO;

    //Select the button that was clicked        
    sender.selected = YES;

    //Set the string of an NSMutableString property called strURLToLoad with the URL
    //The URL is pre stored in the text of the UIButton in the Disabled text.
    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]];

    //Load the URL
    [self loadJSONFromCurrentURL];
}



首先连接到一个属性选项卡上的3个UIButton，我称它们为示例：


btnFaceBook 
btnTwitter
btnTwitter2


在-viewDidLoad中为3个UIButtons设置该选项卡的URL，如下所示：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


为3个UI按钮设置未按下和按下的图像，
您可以通过nib文件或类似的编程方式执行此操作：


[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2UnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2PressedSelected.png"] forState:UIControlStateSelected];


然后将所有3个UIButton的TouchUpInside操作连接到此方法：


- (IBAction)btnFromTabBarClicked:(UIButton *)sender
{
    //Unselect all 3 buttons
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO;

    //Select the button that was clicked        
    sender.selected = YES;

    //Set the string of an NSMutableString property called strURLToLoad with the URL
    //The URL is pre stored in the text of the UIButton in the Disabled text.
    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]];

    //Load the URL
    [self loadJSONFromCurrentURL];
}



首先连接到一个属性选项卡上的3个UIButton，我称它们为示例：


btnFaceBook 
btnTwitter
btnTwitter2


在-viewDidLoad中为3个UIButtons设置该选项卡的URL，如下所示：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


为3个UI按钮设置未按下和按下的图像，
您可以通过nib文件或类似的编程方式执行此操作：


[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2UnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2PressedSelected.png"] forState:UIControlStateSelected];


然后将所有3个UIButton的TouchUpInside操作连接到此方法：


- (IBAction)btnFromTabBarClicked:(UIButton *)sender
{
    //Unselect all 3 buttons
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO;

    //Select the button that was clicked        
    sender.selected = YES;

    //Set the string of an NSMutableString property called strURLToLoad with the URL
    //The URL is pre stored in the text of the UIButton in the Disabled text.
    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]];

    //Load the URL
    [self loadJSONFromCurrentURL];
}



首先连接到一个属性选项卡上的3个UIButton，我称它们为示例：


btnFaceBook 
btnTwitter
btnTwitter2


在-viewDidLoad中为3个UIButtons设置该选项卡的URL，如下所示：


#import "DEMOSecondViewController.h"
#import "DEMONavigationController.h"
#import "PostsObject.h"
#import "AFNetworking.h"

@interface DEMOSecondViewController ()

@end

@implementation DEMOSecondViewController
@synthesize tableView = _tableView, activityIndicatorView = _activityIndicatorView, movies = _movies;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"iCelebri.com";
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Menu"
                                                                             style:UIBarButtonItemStylePlain
                                                                            target:(DEMONavigationController *)self.navigationController
                                                                            action:@selector(showMenu)];

    self.tableView.separatorColor = [UIColor clearColor];

    // Setting Up Activity Indicator View
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    self.activityIndicatorView.hidesWhenStopped = YES;
    self.activityIndicatorView.center = self.view.center;
    [self.view addSubview:self.activityIndicatorView];
    [self.activityIndicatorView startAnimating];
    self.tableView.separatorColor = [UIColor clearColor];

    // Initializing Data Source
    self.movies = [[NSArray alloc] init];

    NSURL *url = [[NSURL alloc] initWithString:@"http://my-site.com/jsonfile.php?name=Name"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        self.movies = JSON;
        [self.activityIndicatorView stopAnimating];
        [self.tableView reloadData];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
    }];

    [operation start];
}

// Table View Data Source Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (self.movies && self.movies.count) {
        return self.movies.count;
    } else {
        return 0;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 124;
}

- (void)tableView:(UITableView *)tableView
  willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [cell setBackgroundColor:[UIColor clearColor]];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *simpleTableIdentifier = @"PostsObject";

    PostsObject *cell = (PostsObject *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PostsObject" owner:self options:nil];
        cell = [nib objectAtIndex:0];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"background.png"]];

        self.tableView.backgroundView = imageView;
    }

    NSDictionary *movie = [self.movies objectAtIndex:indexPath.row];
    cell.title.text = [movie objectForKey:@"message"];
    cell.published.text = [movie objectForKey:@"published"];

    return cell;
}


@end



@interface DEMOSecondViewController ()
@property (strong) NSURL *url;
@end



[btnFaceBook setTitle:@"http://URLFacebook.com" forState:UIControlStateDisabled];
[btnTwitter setTitle:@"http://URLTwitter.com" forState:UIControlStateDisabled];
[btnTwitter2 setTitle:@"http://URLTwitter2.com" forState:UIControlStateDisabled];


为3个UI按钮设置未按下和按下的图像，
您可以通过nib文件或类似的编程方式执行此操作：


[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnFaceBook setBackgroundImage:[UIImage imageNamed:@"imageFacebookPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterUnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter setBackgroundImage:[UIImage imageNamed:@"imageTwitterPressedSelected.png"] forState:UIControlStateSelected];

[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2UnpressedUnSelected.png"] forState:UIControlStateNormal];
[btnTwitter2 setBackgroundImage:[UIImage imageNamed:@"imageTwitter2PressedSelected.png"] forState:UIControlStateSelected];


然后将所有3个UIButton的TouchUpInside操作连接到此方法：


- (IBAction)btnFromTabBarClicked:(UIButton *)sender
{
    //Unselect all 3 buttons
    btnFaceBook.selected = btnTwitter.selected = btnTwitter2.selected = NO;

    //Select the button that was clicked        
    sender.selected = YES;

    //Set the string of an NSMutableString property called strURLToLoad with the URL
    //The URL is pre stored in the text of the UIButton in the Disabled text.
    [strURLToLoad setString:[sender titleForState:UIControlStateDisabled]];

    //Load the URL
    [self loadJSONFromCurrentURL];
}



这个视图是由按钮推动的吗？“这是一个新的视图控制器吗？”这个视图是由按钮推动的吗？“这是一个新的视图控制器吗？”这个视图是由按钮推动的吗？“这是一个新的视图控制器吗？好的，我已经做了。但是当我点击按钮时什么也没发生。。我刚刚意识到，对于第一个JSON文件，title参数是“Message”，而对于第二个JSON文件，title参数是“Tweet”。如果我使用您的方法，那么它将无法识别第二个JSON文件的参数。怎么可能解决这个问题@BalestraPatrick只需复制该方法即可。首先，用一个单独的方法移动你的网络代码，并将其作为参数传递给新的NSURL。这并不是问题的全部答案。好的，我已经这样做了。但是当我点击按钮时什么也没发生。。我刚刚意识到，对于第一个JSON文件，title参数是“Message”，而对于第二个JSON文件，title参数是“Tweet”。如果我使用您的方法，那么它将无法识别第二个JSON文件的参数。怎么可能解决这个问题@BalestraPatrick只需复制该方法即可。首先，用一个单独的方法移动你的网络代码，并将其作为参数传递给新的NSURL。这并不是问题的全部答案。好的，我已经这样做了。但是当我点击按钮时什么也没发生。。我刚刚意识到，对于第一个JSON文件，title参数是“Message”，而对于第二个JSON文件，title参数是“Tweet”。如果我使用您的方法，那么它将无法识别第二个JSON文件的参数。怎么可能解决这个问题@BalestraPatrick只需复制该方法即可。首先，用一个单独的方法移动你的网络代码，并将其作为参数传递给新的NSURL。这并不是问题的全部答案。好的，我已经这样做了。但是当我点击按钮时什么也没发生。。我刚刚意识到，对于第一个JSON文件，title参数是“Message”，而对于第二个JSON文件，title参数是“Tweet”。如果我使用您的方法，那么它将无法识别第二个JSON文件的参数。怎么可能解决这个问题@BalestraPatrick只需复制该方法即可。首先，用一个单独的方法移动你的网络代码，并将其作为参数传递给新的NSURL。这并没有问题的全部答案。太棒了，它可以工作了！非常感谢你，帮了我很大的忙。你真的很好！：）太棒了，真管用！非常感谢你，帮了我很大的忙。你真的很好！：）太棒了，真管用！非常感谢你，帮了我很大的忙。你真的很好！：）太棒了，真管用！非常感谢你，帮了我很大的忙。你真的很好！：）