Xamarin.Forms Button长按事件

在平时的开发中，我们经常遇到需要Button能够拥有长按事件，但是在Xamarin.Forms中Button并没有该事件，

此时我们如何来实现呢？

我们知道在Xamarin.Forms中可以通过CustomRenderer来根据不同平台各自处理。

这里我们即便用这个方法来实现长按事件：

Android的长按事件：

[assembly: Xamarin.Forms.ExportRenderer (typeof (MyButton), typeof (MyButtonRenderer))]
namespace MyApp.Android
{   public class MyButtonRenderer : ButtonRenderer{protected override void OnElementChanged (ElementChangedEventArgs<global::Xamarin.Forms.Button> e){base.OnElementChanged (e);if (e.OldElement == null) {var nativeButton = Control;nativeButton.LongClick += delegate {//Do something
                        };}}}
}

iOS长按事件处理：

[assembly:ExportRenderer (typeof(ButtonWithLongPressGesture), typeof(LongPressGestureRecognizerButtonRenderer))]
namespace SampleApp.iOS
{public class LongPressGestureRecognizerButtonRenderer : ButtonRenderer{ButtonWithLongPressGesture view;public ButtonPressGestureRecognizerImageRenderer (){this.AddGestureRecognizer (new UILongPressGestureRecognizer ((longPress) => {if (longPress.State == UIGestureRecognizerState.Began) {view.HandleLongPress(view, new EventArgs());}}));}protected override void OnElementChanged (ElementChangedEventArgs<Button> e){base.OnElementChanged (e);if (e.NewElement != null)view = e.NewElement as ButtonWithLongPressGesture;}}
}