iOS 8 后使用UIBlurEffect 类和UIVisualEffectView 类添加毛玻璃特效更加便捷，高效。
//创建ImageView IImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"5"]]; // 创建需要的毛玻璃特效类型 /** * UIBlurEffectStyleExtraLight, * UIBlurEffectStyleLight, * UIBlurEffectStyleDark */ UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]; //添加到要有毛玻璃特效的控件中 UIVisualEffectView *visual = [[UIVisualEffectView alloc] initWithEffect:blur]; visual.frame = imageView.bounds; [self.view addSubview:imageView];
效果图：
原图:
(1) UIBlurEffectStyleExtraLight
(2) UIBlurEffectStyleLight
(3) UIBlurEffectStyleDark
