用block响应button的点击事件

1.继承UIButton ；

2.在自己定义的button类中的方法

addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents 实现block的触发

代码示例：

//  ZJBlockButton.h

//  BlockTest

//

//  Created by 何助金 on 15/4/5.

//  Copyright (c) 2015年 何助金. All rights reserved.

//

#import <UIKit/UIKit.h>

@classZJBlockButton;

typedef void (^ButtonBlock)(ZJBlockButton *);//定义一个block

@interface ZJBlockButton : UIButton

@property (nonatomic,copy)ButtonBlock block;

@end

//  ZJBlockButton.m

//  BlockTest

//

//  Created by 何助金 on 15/4/5.

//  Copyright (c) 2015年 何助金. All rights reserved.

//

#import "ZJBlockButton.h"

@implementation ZJBlockButton

-(instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[selfaddTarget:selfaction:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

}

returnself;

}

- (void)buttonClick:(ZJBlockButton *)sender

{

_block(self);

}

3.使用：

, , , )];

zjButton.block = ^(ZJBlockButton *button){

NSLog(@"button click!");

};

[zjButton setTitle:@"touchButton"forState:UIControlStateNormal];

zjButton.backgroundColor = [UIColor  grayColor];

[self.view addSubview:zjButton];

PS:可以用同样的方法实现 alertView的Block

//  ZJAlertView.h

//  BlockTest

//

//  Created by 何助金 on 15/4/5.

//  Copyright (c) 2015年 何助金. All rights reserved.

//

#import <UIKit/UIKit.h>

typedef void (^AlertBlock)(NSInteger);//定义block类型

@interface ZJAlertView : UIAlertView

@property (nonatomic,copy)AlertBlock block;

//需要自定义初始化方法 添加参数 block:(AlertBlock)block;

-(instancetype)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles  block:(AlertBlock)block;

@end

的方法实现 alertView的block响应 直接上代码

//  ZJAlertView.m

//  BlockTest

//

//  Created by 何助金 on 15/4/5.

//  Copyright (c) 2015年 何助金. All rights reserved.

//

#import "ZJAlertView.h"

@implementation ZJAlertView

-(instancetype)initWithTitle:(NSString *)title message:(NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString *)otherButtonTitles block:(AlertBlock)block

{

self = [super initWithTitle:title message:message delegate:self cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitles,nil];

if (self) {

self.block = block ;//block 绑定

}

returnself;

}

//#pragma mark -AlertViewDelegate

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{

//这里调用函数指针_block(要传进来的参数);

_block(buttonIndex);

}

应用：

- (void)creatBlockAlertView

{

ZJAlertView *alertView = [[ZJAlertViewalloc]initWithTitle:@"test"message:@"alert Block "delegate:nilcancelButtonTitle:@"cancel"otherButtonTitles:@"Ok"block:^(NSInteger index) {

NSLog(@"click at index %ld",index);

}];

[alertView show];

}