在须要模糊的UIView上。加入一个UIVisualEffectView对象就可以。

效果例如以下图：

代码例如以下：

UIImageView *imageview = [[UIImageViewalloc]
init];

imageview.,,
, );

imageview.image = [UIImageimageNamed:@"2"];

imageview.contentMode =UIViewContentModeScaleAspectFit;

imageview.userInteractionEnabled =YES;

[self.viewaddSubview:imageview];

UIBlurEffect *blur = [UIBlurEffecteffectWithStyle:UIBlurEffectStyleLight];

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

effectview.,,
imageview.,);

[imageviewaddSubview:effectview];

UIButton *btn = [UIButtonbuttonWithType:UIButtonTypeSystem];

btn.,,
, );

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

[effectview.contentViewaddSubview:btn];

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