从不同的视图更改标签 [英] Change label from a different view

问题描述

这主要是一个代表团的问题，因为我还在学习，没有得到它。我不知道如何创建我需要的代理人。

This is mainly a delegation question because I'm still learning and don't get it. I don't know how to go about creating the delegate I need.

我知道类似的问题已经被问到，但解决方案不能帮助我。如何在View 1中使用UITextField的内容切换标签的文本？

I know similar questions have been asked but the solutions don't help me out. How can I switch the text of a label on View 1 with the contents of a UITextField from View 2?

谢谢！

推荐答案

在此代码片段中，ChildViewController是您的View2，ParentViewController是您的View1。

In this code snippet, ChildViewController is your View2 and ParentViewController is your View1.

在您的ChildViewController.h文件中：

In your ChildViewController.h file:

@protocol ChildViewControllerDelegate <NSObject>
- (void)parentMethodThatChildCanCall:(NSString *)string;  //pass back the string value from your textfield
@end

@interface ChildViewController : UIViewController 
{
    @property (weak, nonatomic) IBOutlet UITextField *myTextField;
}
@property (assign) id <ChildViewControllerDelegate> delegate;

在您的ChildViewController.m文件中：

In your ChildViewController.m file:

@implementation ChildViewController
@synthesize delegate;

// Some where in your ChildViewController.m file
// to call parent method:
//  [self.delegate parentMethodThatChildCanCall:myTextField.text];

在ParentViewController.h文件中：

In ParentViewController.h file:

@interface parentViewController <ChildViewControllerDelegate>
{
    @property (strong, nonatomic) IBOutlet UILabel *myLabel;
}

在ParentViewController.m文件中：

In ParentViewController.m file:

//after create instant of your ChildViewController

childViewController.delegate = self;

- (void) parentMethodThatChildCanCall:(NSString *)string
{
  // assign your passed back textfield value to your label here
    myLabel.text = string;
}

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