Xamarin Forms Swipe Left/Swipe Right Gestures

Question

I want to preface this by saying I\'m completely new to mobile development, Xamarin, C#, .Net.

I\'m working on creating a mobile app using Xamarain Forms and have ru

Answer 1

No need third party libraries.. No need to pay.. Just add these two classes & Implement your swipe listeners

Step 1: Copy paste these two classes

SwipeListener.cs

using System;
using Xamarin.Forms;

namespace SwipeLib
{
public class SwipeListener : PanGestureRecognizer
{
    private ISwipeCallBack mISwipeCallback;
    private double translatedX = 0, translatedY = 0;

    public SwipeListener(View view, ISwipeCallBack iSwipeCallBack)
    {
        mISwipeCallback = iSwipeCallBack;
        var panGesture = new PanGestureRecognizer();
        panGesture.PanUpdated += OnPanUpdated;
        view.GestureRecognizers.Add(panGesture);
    }

    void OnPanUpdated(object sender, PanUpdatedEventArgs e)
    {

        View Content = (View)sender;

        switch (e.StatusType) {

            case GestureStatus.Running:

                try {
                    translatedX = e.TotalX;
                    translatedY = e.TotalY;
                } catch (Exception err) {
                    System.Diagnostics.Debug.WriteLine("" + err.Message);
                }
                break;

            case GestureStatus.Completed:

                System.Diagnostics.Debug.WriteLine("translatedX : " + translatedX);
                System.Diagnostics.Debug.WriteLine("translatedY : " + translatedY);

                if (translatedX < 0 && Math.Abs(translatedX) > Math.Abs(translatedY)) {
                    mISwipeCallback.onLeftSwipe(Content);
                } else if (translatedX > 0 && translatedX > Math.Abs(translatedY)) {
                    mISwipeCallback.onRightSwipe(Content);
                } else if (translatedY < 0 && Math.Abs(translatedY) > Math.Abs(translatedX)) {
                    mISwipeCallback.onTopSwipe(Content);
                } else if (translatedY > 0 && translatedY > Math.Abs(translatedX)) {
                    mISwipeCallback.onBottomSwipe(Content);
                } else {
                    mISwipeCallback.onNothingSwiped(Content);
                }

                break;

        }
    }

}
}

ISwipeCallBack.cs

using System;
using Xamarin.Forms;
namespace SwipeLib
{  
public interface ISwipeCallBack
{

    void onLeftSwipe(View view);
    void onRightSwipe(View view);
    void onTopSwipe(View view);
    void onBottomSwipe(View view);
    void onNothingSwiped(View view);
}
}

Step 2: From your Xamarin forms pass the view & also interface obj. Then you get result

In my case I pass the label

 SwipeListener swipeListener = new SwipeListener(lbl_swipe, this);

Step 3: Implement the ISwipeCallBack interface

public partial class SwipeLibPage : ContentPage, ISwipeCallBack

Sample project --> https://github.com/rranjithkumar100/Xamarin-Swipe-Library

Answer 2

You can use the NuGet package "XamarinFormsGesture" of Vapolia (doc available here). It's free and easy to use.

Available on iOS and Android but it only works on physical devices (not on simulator).