UIBlurEffect 毛玻璃特效实现

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