iOS8毛玻璃效果
1 UIBlurEffect*blueEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; 2 UIVisualEffectView* visualView=[[UIVisualEffectView alloc]initWithEffect:blueEffect]; 3 visualView.frame = self.tabBar.frame; 4 [self.tabBar insertSubview:visualView atIndex:0];