OC_iOS8.0+毛玻璃效果

系统毛玻璃效果

UIImageView * imageview = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"testImg"]];  
imageview.userInteractionEnabled = YES;  
imageview.contentMode = UIViewContentModeScaleAspectFit;  
imageview.frame = CGRectMake(0, 80, 200, 200);  
[self.view addSubview:imageview];  
  
UIBlurEffect * blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];  
UIVisualEffectView * effectview = [[UIVisualEffectView alloc] initWithEffect:blur];  
effectview.frame = CGRectMake(0, 0, imageview.frame.size.width, imageview.frame.size.height);  
[imageview addSubview:effectview];  
  
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];  
button.frame = CGRectMake(10, 50, 60, 60);  
[button setTitle:@"btn" forState:UIControlStateNormal];  
[effectview.contentView addSubview:button];