Fix touch gestures not working on MAUI iOS once packaged

Directory.Build.props

@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <MauiVersion>8.0.82</MauiVersion>
+    <!-- TODO: Move here other global properties like Version, Author -->
+  </PropertyGroup>
+</Project>

LiveCharts.Maui.sln

@@ -13,6 +13,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MauiSample", "samples\MauiS
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ViewModelsSamples", "samples\ViewModelsSamples\ViewModelsSamples.csproj", "{F12F0322-ED2F-48FB-99C2-61B415457443}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LiveChartsCore.Behaviours", "src\LiveChartsCore.Behaviours\LiveChartsCore.Behaviours.csproj", "{CCFF5DA6-2C27-48C9-BBB6-CDDDAA835116}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -41,6 +43,10 @@ Global
 		{F12F0322-ED2F-48FB-99C2-61B415457443}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F12F0322-ED2F-48FB-99C2-61B415457443}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F12F0322-ED2F-48FB-99C2-61B415457443}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CCFF5DA6-2C27-48C9-BBB6-CDDDAA835116}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CCFF5DA6-2C27-48C9-BBB6-CDDDAA835116}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CCFF5DA6-2C27-48C9-BBB6-CDDDAA835116}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CCFF5DA6-2C27-48C9-BBB6-CDDDAA835116}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

build/pack.ps1

@@ -2,6 +2,7 @@ param([string]$configuration = "Debug", [string]$nupkgOutputPath = "./nupkg")
 
 [Project[]]$projects = @(
     [Project]::new("./src/LiveChartsCore/LiveChartsCore.csproj")
+    [Project]::new("./src/LiveChartsCore.Behaviours/LiveChartsCore.Behaviours.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharp/LiveChartsCore.SkiaSharpView.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharp.Avalonia/LiveChartsCore.SkiaSharpView.Avalonia.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharp.WinForms/LiveChartsCore.SkiaSharpView.WinForms.csproj")
@@ -11,7 +12,6 @@ param([string]$configuration = "Debug", [string]$nupkgOutputPath = "./nupkg")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharpView.Eto/LiveChartsCore.SkiaSharpView.Eto.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharpView.Maui/LiveChartsCore.SkiaSharpView.Maui.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharpView.Uno.WinUI/LiveChartsCore.SkiaSharpView.Uno.WinUI.csproj")
-    [Project]::new("./src/LiveChartsCore.Behaviours/LiveChartsCore.Behaviours.csproj")
     [Project]::new("./src/skiasharp/LiveChartsCore.SkiaSharpView.WinUI/LiveChartsCore.SkiaSharpView.WinUI.csproj")
 )
 
@@ -41,6 +41,6 @@ foreach ($p in $projects) {
     if (Test-Path $($folder + "/bin")) {
         Remove-Item $($folder + "/bin") -Force -Recurse
     }
-    
+
     dotnet pack $p.src -o $nupkgOutputPath -c $configuration -p:IncludeSymbols=true -p:SymbolPackageFormat=snupkg
 }

global.json

@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "8.0.401",
+    "rollForward": "latestFeature"
+  }
+}

samples/MauiSample/MauiProgram.cs

@@ -9,6 +9,7 @@ public static MauiApp CreateMauiApp()
         var builder = MauiApp.CreateBuilder();
         _ = builder
             .UseSkiaSharp()
+            .UseLiveCharts()
             .UseMauiApp<App>()
             .ConfigureFonts(fonts =>
             {

samples/MauiSample/MauiSample.csproj

@@ -12,7 +12,7 @@
 		The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;
 		either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->
     <!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->
-    
+
 		<OutputType>Exe</OutputType>
 		<RootNamespace>MauiSample</RootNamespace>
 		<UseMaui>true</UseMaui>

samples/MauiSample/Platforms/Android/AndroidManifest.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="31" />
 	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-</manifest>
+</manifest>

src/LiveChartsCore.Behaviours/ChartBehaviour.MacCatalyst.cs

@@ -39,132 +39,45 @@ public partial class ChartBehaviour
 #if MACCATALYST
 
     /// <summary>
-    /// Builds a mac catalyst gesture recognizer.
+    /// Gets the hover gesture recognizer.
     /// </summary>
-    /// <param name="view">the view.</param>
-    /// <returns>the recognizer.</returns>
-    protected UIHoverGestureRecognizer GetMacCatalystHover(UIView view)
-    {
-        return new UIHoverGestureRecognizer((UIHoverGestureRecognizer e) =>
-        {
-            switch (e.State)
-            {
-                case UIGestureRecognizerState.Changed:
-                    var p = e.LocationInView(view);
-                    Moved?.Invoke(view, new(new(p.X, p.Y), e));
-                    break;
-                case UIGestureRecognizerState.Cancelled:
-                case UIGestureRecognizerState.Failed:
-                case UIGestureRecognizerState.Ended:
-                    Exited?.Invoke(view, new(e));
-                    break;
-                case UIGestureRecognizerState.Possible:
-                case UIGestureRecognizerState.Began:
-                default:
-                    break;
-            }
-        });
-    }
+    protected UIHoverGestureRecognizer MacCatalystHoverGestureRecognizer { get; }
+
 #endif
 
     /// <summary>
-    /// Builds a mac catalyst gesture recognizer.
+    /// Gets the long press gesture recognizer.
     /// </summary>
-    /// <param name="view">the view.</param>
-    /// <returns>the recognizer.</returns>
-    protected UILongPressGestureRecognizer GetMacCatalystLongPress(UIView view)
-    {
-        return new UILongPressGestureRecognizer((UILongPressGestureRecognizer e) =>
-        {
-            var location = e.LocationInView(view);
-            var p = new LvcPoint((float)location.X, (float)location.Y);
-            var isRightClick = (DateTime.Now - _previousPress).TotalMilliseconds < 500;
-            var isPinch = e.NumberOfTouches > 1;
-
-            switch (e.State)
-            {
-                case UIGestureRecognizerState.Began:
-                    Pressed?.Invoke(view, new(p, isRightClick, e));
-                    _previousPress = DateTime.Now;
-                    break;
-                case UIGestureRecognizerState.Changed:
-                    Moved?.Invoke(view, new(p, e));
-                    break;
-                case UIGestureRecognizerState.Cancelled:
-                case UIGestureRecognizerState.Ended:
-                    Released?.Invoke(view, new(p, isRightClick, e));
-                    break;
-                case UIGestureRecognizerState.Possible:
-                case UIGestureRecognizerState.Failed:
-                default:
-                    break;
-            }
-        })
-        {
-            MinimumPressDuration = 0,
-            ShouldRecognizeSimultaneously = (g1, g2) => true
-        };
-    }
-
-    private float _previousScale = 1;
+    protected UILongPressGestureRecognizer MacCatalystLongPressGestureRecognizer { get; }
 
     /// <summary>
-    /// Builds a mac catalyst gesture recognizer.
+    /// Gets the pinch gesture recognizer.
     /// </summary>
-    /// <param name="view">the view.</param>
-    /// <returns>the recognizer.</returns>
-    protected UIPinchGestureRecognizer GetMacCatalystPinch(UIView view)
-    {
-        return new UIPinchGestureRecognizer((UIPinchGestureRecognizer e) =>
-        {
-            var p = e.LocationInView(view);
-
-            switch (e.State)
-            {
-                case UIGestureRecognizerState.Began:
-                    _previousScale = 1;
-                    break;
-                case UIGestureRecognizerState.Changed:
-                    var s = (float)e.Scale;
-                    var delta = _previousScale - s;
-                    Pinched?.Invoke(view, new(1 - delta, new(p.X, p.Y), e));
-                    _previousScale = s;
-                    break;
-                case UIGestureRecognizerState.Ended:
-                case UIGestureRecognizerState.Cancelled:
-                    break;
-                case UIGestureRecognizerState.Possible:
-                case UIGestureRecognizerState.Failed:
-                default:
-                    break;
-            }
-        })
-        {
-            ShouldRecognizeSimultaneously = (g1, g2) => true
-        };
-    }
+    protected UIPinchGestureRecognizer MacCatalystPinchGestureRecognizer { get; }
 
-    private CGPoint? _last;
+    /// <summary>
+    /// Gets the pan gesture recognizer.
+    /// </summary>
+    protected UIPanGestureRecognizer MacCatalystPanGestureRecognizer { get; }
 
     /// <summary>
-    /// Builds a mac catalyst gesture recognizer.
+    /// Initializes a new instance of the <see cref="ChartBehaviour"/> class.
     /// </summary>
-    /// <param name="view">The view.</param>
-    /// <returns>The recognizer.</returns>
-    protected UIPanGestureRecognizer GetMacCatalystOnPan(UIView view)
+    public ChartBehaviour()
     {
-        return new UIPanGestureRecognizer((UIPanGestureRecognizer e) =>
+#if MACCATALYST
+        MacCatalystHoverGestureRecognizer = new UIHoverGestureRecognizer(OnHover);
+#endif
+        MacCatalystLongPressGestureRecognizer = new UILongPressGestureRecognizer(OnLongPress)
         {
-            var l = e.LocationInView(view);
-            _last ??= l;
-            var delta = _last.Value.Y - l.Y;
-            var isZoom = e.NumberOfTouches == 0;
-            var tolerance = 5; // just a factor to avoid multiple calls.
-
-            if (e.State == UIGestureRecognizerState.Ended || !isZoom || Math.Abs(delta) < tolerance) return;
-            Scrolled?.Invoke(view, new(new(l.X, l.Y), delta, e));
-            _last = l;
-        })
+            MinimumPressDuration = 0,
+            ShouldRecognizeSimultaneously = (g1, g2) => true
+        };
+        MacCatalystPinchGestureRecognizer = new UIPinchGestureRecognizer(OnPinch)
+        {
+            ShouldRecognizeSimultaneously = (g1, g2) => true
+        };
+        MacCatalystPanGestureRecognizer = new UIPanGestureRecognizer(OnPan)
         {
 #if MACCATALYST
             AllowedScrollTypesMask = UIScrollTypeMask.Discrete | UIScrollTypeMask.Continuous,
@@ -173,6 +86,102 @@ protected UIPanGestureRecognizer GetMacCatalystOnPan(UIView view)
             ShouldRecognizeSimultaneously = (g1, g2) => true
         };
     }
+
+#if MACCATALYST
+
+    private void OnHover(UIHoverGestureRecognizer e)
+    {
+        var view = e.View;
+        switch (e.State)
+        {
+            case UIGestureRecognizerState.Changed:
+                var p = e.LocationInView(view);
+                Moved?.Invoke(view, new(new(p.X, p.Y), e));
+                break;
+            case UIGestureRecognizerState.Cancelled:
+            case UIGestureRecognizerState.Failed:
+            case UIGestureRecognizerState.Ended:
+                Exited?.Invoke(view, new(e));
+                break;
+            case UIGestureRecognizerState.Possible:
+            case UIGestureRecognizerState.Began:
+            default:
+                break;
+        }
+    }
+
+#endif
+
+    private void OnLongPress(UILongPressGestureRecognizer e)
+    {
+        var view = e.View;
+        var location = e.LocationInView(view);
+        var p = new LvcPoint((float)location.X, (float)location.Y);
+        var isRightClick = (DateTime.Now - _previousPress).TotalMilliseconds < 500;
+        var isPinch = e.NumberOfTouches > 1;
+
+        switch (e.State)
+        {
+            case UIGestureRecognizerState.Began:
+                Pressed?.Invoke(view, new(p, isRightClick, e));
+                _previousPress = DateTime.Now;
+                break;
+            case UIGestureRecognizerState.Changed:
+                Moved?.Invoke(view, new(p, e));
+                break;
+            case UIGestureRecognizerState.Cancelled:
+            case UIGestureRecognizerState.Ended:
+                Released?.Invoke(view, new(p, isRightClick, e));
+                break;
+            case UIGestureRecognizerState.Possible:
+            case UIGestureRecognizerState.Failed:
+            default:
+                break;
+        }
+    }
+
+    private float _previousScale = 1;
+
+    private void OnPinch(UIPinchGestureRecognizer e)
+    {
+        var view = e.View;
+        var p = e.LocationInView(view);
+
+        switch (e.State)
+        {
+            case UIGestureRecognizerState.Began:
+                _previousScale = 1;
+                break;
+            case UIGestureRecognizerState.Changed:
+                var s = (float)e.Scale;
+                var delta = _previousScale - s;
+                Pinched?.Invoke(view, new(1 - delta, new(p.X, p.Y), e));
+                _previousScale = s;
+                break;
+            case UIGestureRecognizerState.Ended:
+            case UIGestureRecognizerState.Cancelled:
+                break;
+            case UIGestureRecognizerState.Possible:
+            case UIGestureRecognizerState.Failed:
+            default:
+                break;
+        }
+    }
+
+    private CGPoint? _last;
+    private void OnPan(UIPanGestureRecognizer e)
+    {
+        var view = e.View;
+        var l = e.LocationInView(view);
+        _last ??= l;
+        var delta = _last.Value.Y - l.Y;
+        var isZoom = e.NumberOfTouches == 0;
+        var tolerance = 5; // just a factor to avoid multiple calls.
+
+        if (e.State == UIGestureRecognizerState.Ended || !isZoom || Math.Abs(delta) < tolerance) return;
+        Scrolled?.Invoke(view, new(new(l.X, l.Y), delta, e));
+        _last = l;
+    }
 }
 
 #endif

src/LiveChartsCore.Behaviours/ChartBehaviour._shared.cs

@@ -34,12 +34,12 @@ public abstract partial class ChartBehaviour
     /// Gets or sets the screen size, only used internally by the Android handler, to implement a
     /// workaround for https://github.com/dotnet/maui/issues/18547.
     /// </summary>
-    public LvcSize ScreenSize { get; set; }
+    public virtual LvcSize ScreenSize { get; } = new(320, 480);
 
     /// <summary>
     /// Gets or sets the screen density.
     /// </summary>
-    public double Density { get; set; }
+    public virtual double Density { get; } = 1.0;
 
     /// <summary>
     /// Called when the pointer/tap is pressed.

src/LiveChartsCore.Behaviours/LiveChartsCore.Behaviours.csproj

@@ -41,7 +41,6 @@
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
-    <DebugType>embedded</DebugType>
   </PropertyGroup>
 
   <PropertyGroup>

src/LiveChartsCore/LiveChartsCore.csproj

@@ -36,7 +36,6 @@
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
-    <DebugType>embedded</DebugType>
   </PropertyGroup>
 
   <PropertyGroup>

src/skiasharp/LiveChartsCore.SkiaSharp/LiveChartsCore.SkiaSharpView.csproj

@@ -36,7 +36,6 @@
     <ContinuousIntegrationBuild>true</ContinuousIntegrationBuild>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
-    <DebugType>embedded</DebugType>
   </PropertyGroup>
 
   <PropertyGroup>

src/skiasharp/LiveChartsCore.SkiaSharpView.Maui/CartesianChart.xaml

@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<ContentView x:Class="LiveChartsCore.SkiaSharpView.Maui.CartesianChart"
-             xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
-             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-             xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Maui">
+<lvc:ChartView x:Class="LiveChartsCore.SkiaSharpView.Maui.CartesianChart"
+               xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+               xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+               xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Maui">
     <ContentView.Content>
         <lvc:MotionCanvas x:Name="canvas"/>
     </ContentView.Content>
-</ContentView>
+</lvc:ChartView>