重写AlertView（用block）

@interface AlertView : UIView

@property (nonatomic,copy) void(^block)(UIColor *color);

- (id)initWithAlertView;

- (void)showTwo;

@end

自定义View的.m文件

- (id)initWithAlertView

{

self = [super init];//自定义init方法 就是重写了系统的init方法；

if (self)

{

UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeCustom];

btn1.backgroundColor = [UIColor redColor];

btn1.frame = CGRectMake(5, 100, 40, 25);

[btn1 addTarget:self action:@selector(btn1Click:) forControlEvents:UIControlEventTouchUpInside];

[self addSubview:btn1];

UIButton *btn2 = [UIButton buttonWithType:UIButtonTypeCustom];

btn2.backgroundColor = [UIColor greenColor];

btn2.frame = CGRectMake(150, 100, 40, 25);

[btn2 addTarget:self action:@selector(btn2Click:) forControlEvents:UIControlEventTouchUpInside];

[self addSubview:btn2];

}

return self;

}

- (void)btn1Click:(UIButton *)btn

{

self.block(btn.backgroundColor);

[self removeFromSuperview];

}

- (void)btn2Click:(UIButton *)btn

{

self.block(btn.backgroundColor);

[self removeFromSuperview];

}

主界面的.m

- (IBAction)buttonClick:(id)sender

{

AlertView *alertView = [[AlertView alloc] initWithAlertView];

alertView.backgroundColor = [UIColor grayColor];

alertView.frame = CGRectMake(100, 100, 200, 130);

//    [alertView initWithAlertView];

[self.view addSubview:alertView];

__block ViewController *vc = self;

alertView.block = ^(UIColor *color){

vc.view.backgroundColor = color;

};

//    [alertView showTwo];要不要都行 看情况而定

}