iOS中UIButton的block

最新推荐文章于 2025-08-17 23:14:02 发布

原创最新推荐文章于 2025-08-17 23:14:02 发布 · 600 阅读

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#控件 #uibutton #ios

本文介绍了一种使用Objective-C为UIButton添加自定义Block事件处理的方法。通过扩展UIButton类，可以方便地为按钮的不同事件（如点击）绑定Block，使得事件处理更为灵活。这种方法避免了传统target-action模式的一些限制，并提供了更简洁的代码实现。

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UIButton

+block

#import <objc/runtime.h>
#import <UIKit/UIKit.h>

typedef void (^ActionBlock)();

@interface UIButton (block)

@property (readonly) NSMutableDictionary *event;

- (void) handleControlEvent:(UIControlEvents)controlEvent withBlock:(ActionBlock)action;


@end

#import "UIButton+block.h"

@implementation UIButton (block)

static char overviewKey;

@dynamic event;

- (void)handleControlEvent:(UIControlEvents)event withBlock:(ActionBlock)block {
    objc_setAssociatedObject(self, &overviewKey, block, OBJC_ASSOCIATION_COPY_NONATOMIC);
    [self addTarget:self action:@selector(callActionBlock:) forControlEvents:event];
}


- (void)callActionBlock:(id)sender {
    ActionBlock block = (ActionBlock)objc_getAssociatedObject(self, &overviewKey);
    if (block) {
        block();
    }
}

@end