iOS 8使用UIBlurEffect实现毛玻璃特效
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
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