UIButton set touch handler in code-优快云博客

本文介绍了一种通过设置代理协议来安全地响应按钮点击事件的方法，避免了直接使用addTarget导致的目标对象被释放后发送消息的风险。

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One option is to set the button up using

[myButton addTarget:yourOtherClass action:@selector(mySelector:) forControlEvents:UIControlEventTouchUpInside];

but this is a bit dangerous because target is not retained so you could send the message to a deallocated object.

You could instead set up a protocol

PopupViewController.h

#import <UIKit/UIKit.h>

@class PopupViewController;

@protocol PopupViewControllerDelegate
- (void)viewController:(PopupViewController *)controller viewTapped:(UIView *)view;
@end

@interface PopupViewController : UIViewController

@property (nonatomic, assign) NSObject<PopupViewControllerDelegate> *delegate;

- (IBAction)viewTapped:(UIView *)view;

@end

Then in your implementation

PopupViewController.m

- (IBAction)viewTapped:(UIView *)view {
    if (!self.delegate) return;
    if ([self.delegate respondsToSelector:@selector(viewController:viewTapped:)]) {
        [self.delegate viewController:self viewTapped:view];
    }
}

As the method defined in the protocol was not optional I could have instead done a check for (self.delegate) to make sure it is set instead of respondsToSelector.