block回調UIButton

//  BlockBtn.h

#import <UIKit/UIKit.h>

@interface BlockBtn : UIButton

@property (nonatomic,copy) void(^block)(void);

- (id)initWithFrame:(CGRect)frame;

- (void)clickAction;

@end

//  BlockBtn.m

#import "BlockBtn.h"

@implementation BlockBtn

- (id)initWithFrame:(CGRect)frame{

    self = [super initWithFrame:frame];

    if (self) {

        [self addTarget:self action:@selector(clickAction) forControlEvents:UIControlEventTouchUpInside];

    }

    return self;

}

- (void)clickAction{

    _block();

}

@end

//  ViewController.m

#import "ViewController.h"

#import "BlockBtn.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    BlockBtn * bbtn = [[BlockBtn alloc] initWithFrame:CGRectMake((375-60)/2, 120, 60, 40)];

    bbtn.backgroundColor = [UIColor greenColor];

    bbtn.block = ^(void){

        NSLog(@"button event");

    };

    [self.view addSubview:bbtn];

    [bbtn release];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end