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// 定义毛玻璃效果
UIBlurEffect * blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView * effe = [[UIVisualEffectView alloc]initWithEffect:blur];
effe.frame = CGRectMake(50, 90, self.view.frame.size.width - 100, 400);
// 把要添加的视图加到毛玻璃上
UIButton * but = [[UIButton alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];
but.backgroundColor = [UIColor redColor];
[effe addSubview:but];
[self.view addSubview:effe];
//他的效果是枚举，有三种
UIBlurEffectStyleExtraLight
UIBlurEffectStyleLight
UIBlurEffectStyleDark```
之后还有你想把你的图片模糊也可以这样添加：
```objc
// 定义需要毛玻璃化的图片
UIImageView * image = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"2.png"]];
image.frame = CGRectMake(100, 100, 100, 100);
// 定义毛玻璃效果
UIBlurEffect * blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView * effe = [[UIVisualEffectView alloc]initWithEffect:blur];
effe.frame = CGRectMake(50, 90, self.view.frame.size.width - 100, 400);
// 添加毛玻璃
[image addSubview:effe];
[self.view addSubview:image];```
