毛玻璃磨砂特效

iOS 8之后新添加了UIBlurEffect 类和 UIVisualEffectView 类来实现毛玻璃磨砂特效。

UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];
effectview.frame = self.view.bounds;
[self.view addSubview:effectview];

毛玻璃特效类型：

UIBlurEffectStyleExtraLight

UIBlurEffectStyleLight

UIBlurEffectStyleDark