毛玻璃效果

UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight

];

       

UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect

:blur];

        effectview.

frame = CGRectMake(0, 0, screenW, screenH);

        [self addSubview:effectview];