有没有办法用Xamarin.Forms识别屏幕上的短按或长按？

Question

我有一个应用程序响应屏幕上的短按.我通过添加手势识别器来做到这一点.

有没有办法可以让它对短期或长期的新闻做出回应并让这些方法调用不同的方法？

Answer 1

您将为此实现渲染器.在iOS的情况下,您可以使用UILongPressGestureRecognizer检测长按动作,而在Android的情况下,您可以使用GestureDetector它来做同样的事情.

表格控制

public class CustomView : ContentView
{
    public event EventHandler<EventArgs> LongPressEvent;

    public void RaiseLongPressEvent()
    {
        if (IsEnabled)
            LongPressEvent?.Invoke(this, EventArgs.Empty);
    }
}

iOS渲染器

[assembly: ExportRenderer(typeof(CustomView), typeof(CustomViewRenderer))]
namespace AppNamespace.iOS
{
    public class CustomViewRenderer : ViewRenderer<CustomView, UIView>
    {
        UILongPressGestureRecognizer longPressGestureRecognizer;
        protected override void OnElementChanged(ElementChangedEventArgs<CustomView> e)
        {
            longPressGestureRecognizer = longPressGestureRecognizer ??
                new UILongPressGestureRecognizer(() =>
                {
                    Element.RaiseLongPressEvent();
                });

            if (longPressGestureRecognizer != null)
            {
                if (e.NewElement == null)
                {
                    this.RemoveGestureRecognizer(longPressGestureRecognizer);
                }
                else if (e.OldElement == null)
                {
                    this.AddGestureRecognizer(longPressGestureRecognizer);
                }
            }
        }
    }
}

Android渲染器

[assembly: ExportRenderer(typeof(CustomView), typeof(CustomViewRenderer))]
namespace AppNamespace.Droid
{
    public class CustomViewRenderer : ViewRenderer<CustomView, Android.Views.View>
    {
        private CustomViewListener _listener;
        private GestureDetector _detector;

        public CustomViewListener Listener
        {
            get
            {
                return _listener;
            }
        }

        public GestureDetector Detector
        {
            get
            {
                return _detector;
            }
        }

        protected override void OnElementChanged(ElementChangedEventArgs<CustomView> e)
        {
            base.OnElementChanged(e);

            if (e.OldElement == null)
            {
                GenericMotion += HandleGenericMotion;
                Touch += HandleTouch;

                _listener = new CustomViewListener(Element);
                _detector = new GestureDetector(_listener);
            }
        }

        protected override void Dispose(bool disposing)
        {
            GenericMotion -= HandleGenericMotion;
            Touch -= HandleTouch;

            _listener = null;
            _detector?.Dispose();
            _detector = null;

            base.Dispose(disposing);
        }

        void HandleTouch(object sender, TouchEventArgs e)
        {
            _detector.OnTouchEvent(e.Event);
        }

        void HandleGenericMotion(object sender, GenericMotionEventArgs e)
        {
            _detector.OnTouchEvent(e.Event);
        }
    }

    public class CustomViewListener : GestureDetector.SimpleOnGestureListener
    {
        readonly CustomView _target;

        public CustomViewListener(CustomView s)
        {
            _target = s;
        }

        public override void OnLongPress(MotionEvent e)
        {
            _target.RaiseLongPressEvent();

            base.OnLongPress(e);
        }
    }
}

样本用法

<local:CustomView LongPressEvent="Handle_LongPress" />

代码隐藏

void Handle_LongPressEvent(object sender, System.EventArgs e)
{
    //handle long press event here
}

您还可以在上面自定义添加命令,使其更适合MVVM.

您可以参考此链接以获取有关手势识别器的更多详细信息.