iOS 毛玻璃效果参考

- (void)viewDidLoad {
    [super viewDidLoad];

    

    self.imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"4"]];
    self.imageView.frame = self.view.bounds;

   

    /*UIBlurEffectStyleExtraLight, 白色效果

     UIBlurEffectStyleLight,       中
     UIBlurEffectStyleDark         黑色效果*/
    UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];
    self.blurView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
    self.blurView.frame = self.view.bounds;
   
    //透明度  0透明 1不透明
    self.blurView.alpha = 0.3f;
   
    //将毛玻璃效果添加到控件上
    [self.imageView addSubview:self.blurView];
   
    //控件添加到视图上

    [self.view addSubview:self.imageView];

}