在另视图控制器更改标签的文本
问题说明
我有一个名为 FirstViewController 的视图控制器和一个名为 SecondViewController 的视图控制器.我用
I have one view controller named FirstViewController, and a second named SecondViewController. I present second view controller with
UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"mainController"];
[self presentViewController:controller animated:YES completion:nil];
在 SecondViewController 的 .m 中，我想更改 FirstViewController 中 UILabel 的文本.但是，标签的文本不会更新.我如何才能在 SecondViewController 中按下 UIButton 时更新 FirstViewController 的标签?
In SecondViewController's .m, I want to change the text of a UILabel in FirstViewController. However, the label's text isn't updating. How would I make it so that the FirstViewController's label is updated when a UIButton is pressed in SecondViewController?
正确答案
你可以使用委托模式
首先创建您的委托协议
@class SecondViewController;
@protocol SecondViewControllerDelegate
-(void) updateLabelWithString:(NSString*)string
@end
@property (weak, nonatomic) id<SecondViewControllerDelegate>delegate;
在你的 IBAction 连接到你的 UIButton
In your IBAction connected to your UIButton
[self.delegate updateLabelWithString:yourString];
在 FirstViewController.h 中
in FirstViewController.h
#import "SecondViewController.h"
@interface FirstViewController : UIViewController <SecondViewControllerDelegate>
在 FirstViewController.m 中
in FirstViewController.m
-(void) updateLabelWithString:(NSString*)string {
label.text = string;
}
然后在创建控制器实例时，将 FirstViewController 设置为 mainViewController 的委托
then when you create your controller instance, set FirstViewController as the delegate for your mainViewController
controller.delegate = self;
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