typedef NS_ENUM(NSInteger, UIBlurEffectStyle) {        UIBlurEffectStyleExtraLight,        UIBlurEffectStyleLight,        UIBlurEffectStyleDark    } NS_ENUM_AVAILABLE_IOS(8_0);                UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];        UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];        blurEffectView.frame = self.imageView.bounds;        [self.imageView insertSubview:blurEffectView atIndex:0];