从 UIViewController 返回 NSString

发布于 2024-12-14 02:50:39 字数 289 浏览 0 评论 0原文

我想从一个名为 InputUIViewController 的 UIViewController 返回一个 NSString * 到之前启动了 InputUIViewController 的 UIViewController （名为 CallerUIViewController）。我想在 InputUIViewController 调用之前或调用时执行此操作：

[selfmissModelViewControllerAnimated:YES];

有标准方法可以执行此操作吗？

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挽袖吟 2024-12-21 02:50:39

执行此操作的标准方法是使用委托。

在您的 InputViewController 中添加一个新的委托协议以及您的委托的属性。

然后在您的 CallerUIViewController 中实现委托。然后，在您关闭模态视图控制器之前，您可以回调您的委托。

所以你的InputViewController可能看起来像这样：

@protocol InputViewControllerDelegate;

@interface InputViewControllerDelegate : UIViewController {
}

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

@end


@protocol InputViewControllerDelegate
- (void)didFinishWithInputView:(NSString *)stringValue;
@end

关闭模式视图的方法看起来像这样：

-(void)dismissSelf
{
   [self.delegate didFinishWithInputView:@"MY STRING VALUE"];
   [self dismissModalViewControllerAnimated:YES];
}

然后在你的CallerUIViewController中你将实现InputViewControllerDelegate和didFinishWithInputView方法。

CallerUIViewController 标头看起来像：

@interface CallerUIViewController : UIViewController <InputViewControllerDelegate> {
}

并且您的 didFinishWithInputView 方法将实现类似：

- (void)didFinishWithInputView:(NSString *)stringValue
{
    // This method will be called by the InputViewController just before it is dismissed
}

在呈现 InputViewController 之前，您会将委托设置为 self。

-(void)showInputViewController
{
   InputViewController *inputVC = [[InputViewController alloc] init];
   inputVC.delegate = self;

   [self presentModalViewController:inputVC animated:YES];

   [inputVC release];
}

The standard way to do this would be to use a delegate.

In your InputViewController add a new delegate protocal, and a property for your delegate.

Then in your CallerUIViewController implement the delegate. Then just before your dismiss the modal view controller you can call back to your delegate.

So your InputViewController might look like this:

@protocol InputViewControllerDelegate;

@interface InputViewControllerDelegate : UIViewController {
}

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

@end


@protocol InputViewControllerDelegate
- (void)didFinishWithInputView:(NSString *)stringValue;
@end

The method that dismisses the modal view would look something like this:

-(void)dismissSelf
{
   [self.delegate didFinishWithInputView:@"MY STRING VALUE"];
   [self dismissModalViewControllerAnimated:YES];
}

Then in your CallerUIViewController you would implement the InputViewControllerDelegate and the didFinishWithInputView method.

The CallerUIViewController header would look something like:

@interface CallerUIViewController : UIViewController <InputViewControllerDelegate> {
}

and your didFinishWithInputView method would be implemented something like:

- (void)didFinishWithInputView:(NSString *)stringValue
{
    // This method will be called by the InputViewController just before it is dismissed
}

Just before your present the InputViewController you would set the delegate to self.

-(void)showInputViewController
{
   InputViewController *inputVC = [[InputViewController alloc] init];
   inputVC.delegate = self;

   [self presentModalViewController:inputVC animated:YES];

   [inputVC release];
}

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