UIVisualEffectView

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在需要模糊的UIView上，添加一个UIVisualEffectView对象即可。

效果如下图：

代码如下：

UIImageView *imageview = [[UIImageView alloc] init];

imageview.frame = CGRectMake(10, 100, 300, 300);

imageview.image = [UIImage imageNamed:@"2"];

imageview.contentMode = UIViewContentModeScaleAspectFit;

imageview.userInteractionEnabled = YES;

[self.view addSubview:imageview];

UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];

UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];

effectview.frame = CGRectMake(0, 0, imageview.size.width/2, 300);

[imageview addSubview:effectview];

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.frame = CGRectMake(10, 50, 100, 40);

[btn setTitle:@"btn" forState:UIControlStateNormal];

[effectview.contentView addSubview:btn];

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