毛玻璃效果

//**毛玻璃

        UIImageView *imageview=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1221_01.jpeg"]];

        imageview.frame=CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

        [self.view addSubview:imageview];

        [imageview release];

//先创建一个毛玻璃的效果

        UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];

//创建一个毛玻璃视图,指定效果 iOS之后出现的效果

        UIVisualEffectView *effectView=[[UIVisualEffectView alloc] initWithEffect:effect];

         effectView.frame=imageview.frame;

        effectView.alpha=0.5;

        [imageview addSubview:effectView];