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iphone - 从第二个 ViewController 到第一个 ViewController

转载 作者:塔克拉玛干 更新时间:2023-11-02 20:20:37 24 4
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我有 2 个 ViewController,第一个是 TableView,第二个是带有标签的按钮。当我单击第二个 ViewController 中的按钮时,我需要返回 TableView 并在

中设置
cell.detailTextLabel.text

按钮上标签的文本。

要返回到第一个 View ,我使用:

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];

但是我如何将第二个 View 中的标签设置为:

cell.detailTextLabel.text

第一眼?????

最佳答案

我会在第二个 View Controller 中定义一个协议(protocol)和委托(delegate)

@protocol SecondViewController;

@interface SecondViewController : UIViewController

@property (nonatomic, assign) id<SecondViewController> delegate;

@end


@protocol SecondViewController <NSObject>
- (void)secondViewController:(SecondViewController *)controller didTappedOnButton:(UIButton *)button;
@end

然后当点击按钮时调用委托(delegate):

- (IBAction)buttonTapped:(UIButton *)sender
{
// do somthing..

// then tell the delegate about the button tapped
[self.delegate secondViewController:self didTappedOnButton:sender];
}

在你的第一个 View Controller 中实现协议(protocol)

@interface FirstViewController : UIViewController <SecondViewControllerDelegate>

当你推送第二个 View Controller 时,将第一个设置为第二个委托(delegate):

- (void)someMethodThatPushTheSecondViewController
{
SecondViewController *svc = [[SecondViewController alloc] init];
[self.navigationController pushViewController:svc animated:YES];
svc.delegate = self;
}

并实现委托(delegate)方法在点击按钮时得到通知

- (void)secondViewController:(SecondViewController *)controller didTappedOnButton:(UIButton *)button
{
// do somthing after button tapped
// you can get the button title from button.titleLabel.text
}

关于iphone - 从第二个 ViewController 到第一个 ViewController,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11900202/

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