Avoid BlockLiteral based APIs for simplicity

src/iOS/Avalonia.iOS/DispatcherImpl.cs

@@ -34,21 +34,16 @@ internal class DispatcherImpl : IDispatcherImplWithExplicitBackgroundProcessing
             // This is needed to wakeup the loop if we are called from inside of BeforeWait hook
         };
 
-        var observerBlock = new BlockLiteral();
+        var observer = Interop.CFRunLoopObserverCreate(IntPtr.Zero,
-        observerBlock.SetupBlock((Interop.CFRunLoopObserverCallback)ObserverCallback, null);
-        var observer = Interop.CFRunLoopObserverCreateWithHandler(IntPtr.Zero,
             Interop.CFOptionFlags.kCFRunLoopAfterWaiting | Interop.CFOptionFlags.kCFRunLoopBeforeSources |
             Interop.CFOptionFlags.kCFRunLoopBeforeWaiting,
-            true,
+            true, 0, ObserverCallback, IntPtr.Zero);
-            0,
+        Interop.CFRunLoopAddObserver(Interop.CFRunLoopGetMain(), observer, Interop.kCFRunLoopCommonModes);
-            ref observerBlock);
+
-        Interop.CFRunLoopAddObserver(CFRunLoop.Main.Handle, observer, Interop.kCFRunLoopCommonModes);
+        _timer = Interop.CFRunLoopTimerCreate(IntPtr.Zero,
-
-        var timerBlock = new BlockLiteral();
-        timerBlock.SetupBlock((Interop.CFRunLoopTimerCallback)TimerCallback, null);
-        _timer = Interop.CFRunLoopTimerCreateWithHandler(IntPtr.Zero,
             Interop.CFAbsoluteTimeGetCurrent() + DistantFutureInterval,
-            DistantFutureInterval, 0, 0, ref timerBlock);
+            DistantFutureInterval, 0, 0, TimerCallback, IntPtr.Zero);
+        Interop.CFRunLoopAddTimer(Interop.CFRunLoopGetMain(), _timer, Interop.kCFRunLoopCommonModes);
     }
 
     public event Action? Signaled;
@@ -115,7 +110,7 @@ internal class DispatcherImpl : IDispatcherImplWithExplicitBackgroundProcessing
     }
 
     [MonoPInvokeCallback(typeof(Interop.CFRunLoopObserverCallback))]
-    private static void ObserverCallback(IntPtr observer, Interop.CFOptionFlags activity)
+    private static void ObserverCallback(IntPtr observer, Interop.CFOptionFlags activity, IntPtr info)
     {
         if (activity == Interop.CFOptionFlags.kCFRunLoopBeforeWaiting)
         {
@@ -133,7 +128,7 @@ internal class DispatcherImpl : IDispatcherImplWithExplicitBackgroundProcessing
     }
 
     [MonoPInvokeCallback(typeof(Interop.CFRunLoopTimerCallback))]
-    private static void TimerCallback(IntPtr timer)
+    private static void TimerCallback(IntPtr timer, IntPtr info)
     {
         Instance.Timer?.Invoke();
     }

src/iOS/Avalonia.iOS/Interop.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Runtime.InteropServices;
 using CoreFoundation;
 using Foundation;
@@ -13,7 +14,7 @@ internal class Interop
     internal static NativeHandle kCFRunLoopCommonModes = CFString.CreateNative("kCFRunLoopCommonModes");
 
     [Flags]
-    public enum CFOptionFlags : ulong
+    internal enum CFOptionFlags : ulong
     {
         kCFRunLoopBeforeSources = (1UL << 2),
         kCFRunLoopAfterWaiting = (1UL << 6),
@@ -21,27 +22,34 @@ internal class Interop
     }
 
     [UnmanagedFunctionPointer(CallingConvention.StdCall)]
-    public delegate void CFRunLoopObserverCallback(IntPtr observer, CFOptionFlags activity);
+    internal delegate void CFRunLoopObserverCallback(IntPtr observer, CFOptionFlags activity, IntPtr info);
-    
+
     [UnmanagedFunctionPointer(CallingConvention.StdCall)]
-    public delegate void CFRunLoopTimerCallback(IntPtr timer);
+    internal delegate void CFRunLoopTimerCallback(IntPtr timer, IntPtr info);
+    
+    [DllImport(CoreFoundationLibrary)]
+    internal static extern IntPtr CFRunLoopGetMain();
 
     [DllImport(CoreFoundationLibrary)]
-    internal static extern IntPtr CFRunLoopObserverCreateWithHandler(IntPtr allocator, CFOptionFlags activities, bool repeats, int index, ref BlockLiteral block);
+    internal static extern IntPtr CFRunLoopObserverCreate(IntPtr allocator, CFOptionFlags activities,
+        bool repeats, int index, CFRunLoopObserverCallback callout, IntPtr context);
 
     [DllImport(CoreFoundationLibrary)]
     internal static extern IntPtr CFRunLoopAddObserver(IntPtr loop, IntPtr observer, IntPtr mode);
 
     [DllImport(CoreFoundationLibrary)]
-    internal static extern IntPtr CFRunLoopTimerCreateWithHandler(IntPtr allocator, double firstDate, double interval,
+    internal static extern IntPtr CFRunLoopTimerCreate(IntPtr allocator, double firstDate, double interval,
-        CFOptionFlags flags, int order, ref BlockLiteral block);
+        CFOptionFlags flags, int order, CFRunLoopTimerCallback callout, IntPtr context);
 
     [DllImport(CoreFoundationLibrary)]
     internal static extern void CFRunLoopTimerSetTolerance(IntPtr timer, double tolerance);
 
     [DllImport(CoreFoundationLibrary)]
     internal static extern void CFRunLoopTimerSetNextFireDate(IntPtr timer, double fireDate);
-    
+
+    [DllImport(CoreFoundationLibrary)]
+    internal static extern void CFRunLoopAddTimer(IntPtr loop, IntPtr timer, IntPtr mode);
+
     [DllImport(CoreFoundationLibrary)]
     internal static extern double CFAbsoluteTimeGetCurrent();
 }