Ios don'；t在UIScrollView中显示图像

我创建了2个类（

RecipeViewController

&

DetailViewController

）

RecipeView

是向我显示4个单元格（书名）的

TableViewController

，

DetailView

是向我显示任何书籍的许多图像的

UIViewController

我的问题是，当我点击任何单元格并转到下一页时，

UIScroller

不向我显示图像

这是我的代码：

RecipeViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    int x = (indexPath.row)+1;
    NSLog(@"x : %d",x);
    DetailViewController *obj = [[DetailViewController alloc]init];
    obj.yourValue = [NSString stringWithFormat:@"%d",(indexPath.row)+1];
    [self presentModalViewController:obj animated:YES];
    NSLog(@"yourValue1 : %@",obj.yourValue);
}  

#import "DetailViewController.h"
#import "RecipeViewController.h"


@implementation DetailViewController
@synthesize scroller,yourValue;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

   //m1 variable tell me in tableview which choice book 
    int m1 = [self.yourValue integerValue];

    NSLog(@"m1 : %d",m1);

    //this code give me number of images (pages of book)
    NSString *numberbook = [[NSString alloc]initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.102/mamal/book.php?info=0&b=%d",m1]]];

    NSInteger numbook = [numberbook integerValue];

    NSLog(@"%d",numbook);

    for (int i = 1; i <= numbook; i++)
    {
        //this code for recive images from specific book
        NSData *dat = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.102/mamal/book.php?p=%d&b=%d",i,m1]]];
        NSLog(@"%@",dat);

        UIImageView *imagen = [[UIImageView alloc] initWithImage:[UIImage imageWithData:dat]];

        imagen.frame = CGRectMake((i-1)*320, 0, 320, 460);

        [scroller addSubview:imagen];
    }
    scroller.delegate = self;
    scroller.contentSize = CGSizeMake(320*numbook, 460);
    scroller.pagingEnabled = YES;

}

@end

DetailViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    int x = (indexPath.row)+1;
    NSLog(@"x : %d",x);
    DetailViewController *obj = [[DetailViewController alloc]init];
    obj.yourValue = [NSString stringWithFormat:@"%d",(indexPath.row)+1];
    [self presentModalViewController:obj animated:YES];
    NSLog(@"yourValue1 : %@",obj.yourValue);
}  

#import "DetailViewController.h"
#import "RecipeViewController.h"


@implementation DetailViewController
@synthesize scroller,yourValue;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

   //m1 variable tell me in tableview which choice book 
    int m1 = [self.yourValue integerValue];

    NSLog(@"m1 : %d",m1);

    //this code give me number of images (pages of book)
    NSString *numberbook = [[NSString alloc]initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.102/mamal/book.php?info=0&b=%d",m1]]];

    NSInteger numbook = [numberbook integerValue];

    NSLog(@"%d",numbook);

    for (int i = 1; i <= numbook; i++)
    {
        //this code for recive images from specific book
        NSData *dat = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.102/mamal/book.php?p=%d&b=%d",i,m1]]];
        NSLog(@"%@",dat);

        UIImageView *imagen = [[UIImageView alloc] initWithImage:[UIImage imageWithData:dat]];

        imagen.frame = CGRectMake((i-1)*320, 0, 320, 460);

        [scroller addSubview:imagen];
    }
    scroller.delegate = self;
    scroller.contentSize = CGSizeMake(320*numbook, 460);
    scroller.pagingEnabled = YES;

}

@end

#导入“DetailViewController.h”
#导入“RecipeViewController.h”
@实现细节视图控制器
@综合滚动条，你的价值；
-（id）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil
{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
//自定义初始化
}
回归自我；
}
-（无效）viewDidLoad
{
[超级视图下载]；
//m1变量在tableview中告诉我选择哪本书
int m1=[self.yourValue integerValue]；
NSLog（@“m1:%d”，m1）；
//此代码为我提供了图像数（书的页数）
NSString*numberbook=[[NSString alloc]initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@]http://192.168.1.102/mamal/book.php?info=0&b=%d“，m1]]]；
NSInteger numbook=[numberbook integerValue]；
NSLog（@“%d”，numbook）；
对于（int i=1；i嘿，您正在主线程中执行所有操作，可能会出现延迟或其他一些问题，通常不建议这样做，您是否可以使用NickLockWoods实现异步加载图像


这是一个非常好的UIImageView类别，您只需导入AsyncImageView即可使用该函数

[imageView setImageURL:@"ur url"];

它异步加载所有图像，并且有很多自定义项

就你而言：

for (int i = 1; i <= numbook; i++)
{
UIImageView *imagen = [[UIImageView alloc] initWithFrame: CGRectMake((i-1)*320, 0, 320, 460)];
[imagen setImageURL: [NSString stringWithFormat:@"192.168.1.102/mamal/book.php?p=%d&b=%d",i,m1]]]; 
[scroller addSubview:imagen]; 
}

for（int i=1；i如果您确实想使用[NSData DATA WITH CONTENTS OFURL:]，请将其添加到循环、chnage url和图像视图框架中

for (int i = 1; i <= numbook; i++)
{
    UIImageView *yourImage=[[UIImageView alloc]init];
    yourImage.frame = CGRectMake((i-1)*320, 0, 320, 460);
    [scroller addSubview:imagen];

    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);

    dispatch_async(queue, ^{


        NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.102/mamal/book.php?p=%d&b=%d",i,m1]];

        NSData *imgData = [NSData dataWithContentsOfURL:url];

        dispatch_sync(dispatch_get_main_queue(), ^{

            UIImage *downloadedImage = [UIImage imageWithData:imgData];

            yourImage.image = downloadedImage;  
            if(yourImage.image==nil)
            {
                [yourImage setImage:@"placeholder.png"];

            }
        });
    });

}

for（int i=1；i这是什么NSInteger numbook=[numberbook integerValue]；？仔细检查
[UIImage imageWithData:dat]
是否为零？numbook的值是什么？numbook是整数变量，此方法：（NSInteger numbook=[numberbook integerValue]；）将值从NSString保存到integermy friend我有很多url，我的问题是不要显示UIScroller查看很多图像我的朋友我有一个问题：我想更改url并在UIScroller图像中显示，以便我用于循环。上面的代码可以放在循环中吗？我的朋友我使用故事板，在其中放置两页UITableView和UIView，UIView在自己的完整页面中有UISCrollerView。是否有权使用UISCroll？？？