UIVisualEffectView(高斯模糊效果)
/// 高斯模糊。<br> UIView *tempView= [[UIView alloc] initWithFrame: CGRectMake(100, 100, 100, 100)];
tempView.backgroundColor = [UIColor yellowColor];
[self.view addSubview: tempView];
/// UIBlurEffectStyleExtraLight 聚光灯效果
/// UIBlurEffectStyleLight 效果轻
/// UIBlurEffectStyleDark 效果重
UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle: UIBlurEffectStyleLight];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
effectView.frame = CGRectMake(100, 100, 100, 100);
// 作用对tempView做高斯模糊效果。
[self.view addSubview: effectView];
