⭐️ Impl: Add CAAnimation+Block

ios/src_library/Extensions/CAAnimation+Block.swift

@@ -0,0 +1,61 @@
+//
+//  CAAnimation+Block.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 5/1/23.
+//
+
+import Foundation
+
+
+public class CAAnimationBlockDelegate: NSObject, CAAnimationDelegate {
+
+  public typealias StartBlock = (CAAnimation) -> ();
+  public typealias EndBlock = (CAAnimation, Bool) -> ();
+
+  var onStartBlock: StartBlock?
+  var onEndBlock: EndBlock?
+
+  public func animationDidStart(_ anim: CAAnimation) {
+    self.onStartBlock?(anim);
+  };
+
+  public func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
+    self.onEndBlock?(anim, flag);
+  };
+};
+
+public extension CAAnimation {
+
+  private var multicastDelegate: CAAnimationMulticastDelegate {
+    guard let delegate = self.delegate else {
+      return CAAnimationMulticastDelegate();
+    };
+
+    guard let multicastDelegate = delegate as? CAAnimationMulticastDelegate else {
+      let multicastDelegate = CAAnimationMulticastDelegate();
+      multicastDelegate.emitter.add(delegate);
+
+      self.speed = 0;
+
+      self.delegate = multicastDelegate;
+      return multicastDelegate;
+    };
+
+    return multicastDelegate;
+  };
+
+  func startBlock(_ callback: @escaping CAAnimationBlockDelegate.StartBlock) {
+    let blockDelegate = CAAnimationBlockDelegate();
+    self.multicastDelegate.emitter.add(blockDelegate);
+
+    blockDelegate.onStartBlock = callback;
+  };
+
+  func endBlock(_ callback: @escaping CAAnimationBlockDelegate.EndBlock) {
+    let blockDelegate = CAAnimationBlockDelegate();
+    self.multicastDelegate.emitter.add(blockDelegate);
+
+    blockDelegate.onEndBlock = callback;
+  };
+};