Iphone 从其他控件继承的值
我是编程新手。我对继承有一个基本的怀疑。我在Iphone 从其他控件继承的值,iphone,ios,uitableview,inheritance,uipickerview,Iphone,Ios,Uitableview,Inheritance,Uipickerview,我是编程新手。我对继承有一个基本的怀疑。我在ViewController中有一个UITableView，当我选择Tableview的第一行时，我会进入Picker页面，在该页面中，我只需从UIPickerView中选择值。现在我必须选择NSLOG按钮中的视图控制器中的选择器的值。这是我面临的一个小问题 VIewController.m - (void)viewDidLoad { [super viewDidLoad]; tableview =[[UITableView alloc]init
ViewControllerUITableViewTableviewPickerUIPickerViewNSLOG按钮中的视图控制器中的选择器的值。这是我面临的一个小问题
VIewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
tableview =[[UITableView alloc]initWithFrame:CGRectMake(0,0,([UIScreen mainScreen].bounds.size.width),([UIScreen mainScreen].bounds.size.height/2)) style:UITableViewStyleGrouped];
tableview.delegate=self;
tableview.dataSource=self;
[self.view addSubview:tableview];
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(pressed) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"START " forState:UIControlStateNormal];
button.frame = CGRectMake(62, 250, 196, 37);
[self.view addSubview:button];
thearray= [[NSArray alloc]initWithObjects:@"A",@"B ",@"C",@"D",@"E" ,nil];
[super viewDidUnload];
}
-(void)pressed{
// nslog value..i need here the picker value
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 5;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
if(indexPath.row==0){
Picker1 *pick= [[Picker1 alloc] init];
[self navigationController] pushViewController:pick animated:YES]
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NS IndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
cell.textLabel.text=[thearray objectAtIndex:indexPath.row];
return cell;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return [list count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [list objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
// update label text to show selected option
string=[NSString stringWithFormat:@"%@",[list objectAtIndex:row]];
label.text=string;
[self dismissModalViewControllerAnimated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
list =[[NSMutableArray alloc]init];
[list addObject:@"A"];
[list addObject:@"B"];
[list addObject:@"C"];
}
Picker.m
- (void)viewDidLoad
{
[super viewDidLoad];
tableview =[[UITableView alloc]initWithFrame:CGRectMake(0,0,([UIScreen mainScreen].bounds.size.width),([UIScreen mainScreen].bounds.size.height/2)) style:UITableViewStyleGrouped];
tableview.delegate=self;
tableview.dataSource=self;
[self.view addSubview:tableview];
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(pressed) forControlEvents:UIControlEventTouchDown];
[button setTitle:@"START " forState:UIControlStateNormal];
button.frame = CGRectMake(62, 250, 196, 37);
[self.view addSubview:button];
thearray= [[NSArray alloc]initWithObjects:@"A",@"B ",@"C",@"D",@"E" ,nil];
[super viewDidUnload];
}
-(void)pressed{
// nslog value..i need here the picker value
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return 5;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
if(indexPath.row==0){
Picker1 *pick= [[Picker1 alloc] init];
[self navigationController] pushViewController:pick animated:YES]
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NS IndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
cell.textLabel.text=[thearray objectAtIndex:indexPath.row];
return cell;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return [list count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [list objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
// update label text to show selected option
string=[NSString stringWithFormat:@"%@",[list objectAtIndex:row]];
label.text=string;
[self dismissModalViewControllerAnimated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
list =[[NSMutableArray alloc]init];
[list addObject:@"A"];
[list addObject:@"B"];
[list addObject:@"C"];
}
您可以使用代理
在picker.m中，在@interface节上方执行此操作
@protocol pickerDelegate <NSObject>
将此协议的属性设置为
@property(nonatomic,weak)id<pickerDelegate>delegate
现在在viewcontroller.h中，在方法中
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
Picker1 *pick= [[Picker1 alloc] init];
[pick setDelegate : self];
并在viewcontroler.h中实现了dlegate方法
-(void)didFinishPicking:(NSString *)pickedStr
{
[self setStr:pickedStr]
}
其中str是需要在viewcontroller.h中声明的字符串变量，并在按钮单击事件上打印此字符串。听起来您需要一个委托，让选择器将所选值传递回表视图。在Picker.h文件顶部定义委托方法：
@class Picker;
@protocol PickerDelegate <NSObject>
- (void)picker:(Picker *)thePicker didPickValue:(NSString *)theValue;
@end
重要提示：创建选择器时，必须告诉它代理将是谁。您正在表视图中执行此操作，因此调用：
pick.delegate = self;
您可以使用本地通知进行此操作。您能否解释更多…我做了什么…我制作了拾取程序的字符串非原子，保留了
，并且在视图中控制器id做了…@property（非原子，保留）Picker1*delegate1然后nslog（@“value%@”，delegate1.string）在按钮按下操作中…但当我单击按钮时没有显示任何内容…表示值为null@spider1983实际上，我必须选择这些值，然后通过在ViewController中获取这些值，必须执行一些操作..但无法获取值使用此行[yourPickerView selectRow:1不完整项：0动画：否]@Christien，你在那里创建了你的pickerview.还有一件事你必须让你的viewcontroller符合interfaceok中的pickerDelegate如果我需要在按钮中给出条件，比如如果pickers的值从picker==A，打开url…如何做…就像我在按钮{if（piker1.string==@“raj”）{[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@”http://www.google.com“]]；}
if（[picker1.string isEqualToString:@“raj”]）我将其用于[UIApplication sharedApplication]openURL:[NSURL URLWithString:@”http://www.google.com"]]
要检查…但它不是打开URL请尝试在webView中打开它，谢谢..如果我需要在Viewcontroller的按钮中给出条件以检查所选的第一个值并给出类似..if（piker1.string=@“a”）{[[UIApplication sharedApplication]openURL:[NSURL URLWithString:@]http://www.google.com"]];}
您在ViewController.m中实现此委托方法，因此您有-（void）picker:（picker*）picker didPickValue:（NSString*）值{//在此处调用您的代码！}当picker调用委托方法时，它将在ViewController.m中实现。从那里，您可以对值执行任何您想要的操作我在视图控制器中所做的…@property（nonatomic，retain）Picker1*delegate1；…然后按下按钮->nslog（@“value”，delegate1.string）
It's fine./…如果使用picker值给定条件，则给出正确的输出…if（[Picker1.string isEqualToString:@“raj”）{[UIApplication sharedApplication]openURL:[NSURL URLWithString:@”http://www.google.com“]]；}
检查未打开的值
@interface ViewController : UITableViewController <PickerDelegate>
[self.delegate picker:self didPickValue:[NSString stringWithFormat:@"%@",[list objectAtIndex:row]]];
pick.delegate = self;