將UIButton的addTarget: action: forControlEvents:改造成block
建立UIButton+Block，將其引用到.pch中，#import "UIButton+Block.h"

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

將button的點(diǎn)擊事件改為block

1、自定義一個(gè)繼承于UIButton的按鈕

2、聲明block：

返回值類型 函數(shù)名 參數(shù)列表
typedef void (^ButtonBlock)(UIButton *);
@interface MyButton : UIButton

@property(nonatomic,copy)ButtonBlock block;
- (void)addTapBlock:(ButtonBlock)block;
@end

3、重寫button的點(diǎn)擊事件的方法
- (void)addTapBlock:(ButtonBlock)block
{
_block = block;
[self addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
}
- (void)buttonAction:(UIButton *)button
{
_block(button);
}

4、在視圖控制器中調(diào)用button的block方法
[button addTapBlock:^(UIButton *button){

NSLog(@"按鈕被點(diǎn)擊了");

}];