iOS 毛玻璃效果

iOS 7.0 使用UIToolbar类实现毛玻璃效果

     UIImageView *bgImgView = [[UIImageView alloc] initWithFrame:self.view.bounds];
    bgImgView.image = [UIImage imageNamed:@"huoying.jpg"] ;
   
    bgImgView.contentMode = UIViewContentModeScaleAspectFill;

    bgImgView.userInteractionEnabled = YES;
    [self.view addSubview:bgImgView];
    
    
    UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:self.view.bounds];
    toolbar.barStyle = UIBarStyleBlackTranslucent;
    [bgImgView addSubview:toolbar];
    toolbar.alpha = 0.9;

  iOS 8.0后有自带的类专门处理毛玻璃效果:

  /*
     毛玻璃的样式(枚举)
     UIBlurEffectStyleExtraLight,
     UIBlurEffectStyleLight,
     UIBlurEffectStyleDark
     */
    UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
    //毛玻璃视图
    UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
    effectView.frame = CGRectMake(0, 0, bgImgView.frame.size.width, bgImgView.frame.size.height);
    [bgImgView addSubview:effectView];
    effectView.alpha = 0.9f;

 相比 两者效果一样,毛玻璃效果还有其他实现方法(CoreImage、vImage、GPUImage) 
 可参考:http://www.cnblogs.com/xiaofeixiang  http://www.jianshu.com/p/6dd0eab888a6

UIVisualEffectView：

UIToolbar :