//創建ImageViewIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"5"]];  // 創建需要的毛玻璃特效類型  /**   * UIBlurEffectStyleExtraLight,   * UIBlurEffectStyleLight,   * UIBlurEffectStyleDark   */  UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight];  //添加到要有毛玻璃特效的控件中  UIVisualEffectView *visual = [[UIVisualEffectView alloc] initWithEffect:blur];  visual.frame = imageView.bounds;  [self.view addSubview:imageView];