Merge branch '184-platformexceptionunavailable-end-call-failed-the-operation-couldnt-be-completed-comapplecallkiterrorrequesttransaction-error-4-null-null'

Author: cybex-dev

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.1
+
+* Fix: [iOS] Race condition ending call remotely and locally results in a "End Call Failed: The operation couldn’t be completed." error. [Issue #184](https://github.com/cybex-dev/twilio_voice/issues/184)
+
 ## 0.2.0+1
 
 * Fix: [Web] `window.localStorage` deprecated members

ios/Classes/SwiftTwilioVoicePlugin.swift

@@ -6,7 +6,8 @@ import TwilioVoice
 import CallKit
 import UserNotifications
 
-public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHandler, PKPushRegistryDelegate, NotificationDelegate, CallDelegate, AVAudioPlayerDelegate, CXProviderDelegate {
+public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHandler, PKPushRegistryDelegate, NotificationDelegate, CallDelegate, AVAudioPlayerDelegate, CXProviderDelegate, CXCallObserverDelegate {
+    let callObserver = CXCallObserver()
 
     final let defaultCallKitIcon = "callkit_icon"
     var callKitIcon: String?
@@ -44,6 +45,8 @@ public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHand
     var userInitiatedDisconnect: Bool = false
     var callOutgoing: Bool = false
 
+    private var activeCalls: [UUID: CXCall] = [:]
+    
     static var appName: String {
         get {
             return (Bundle.main.infoDictionary!["CFBundleName"] as? String) ?? "Define CFBundleName"
@@ -65,6 +68,7 @@ public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHand
 
         //super.init(coder: aDecoder)
         super.init()
+        callObserver.setDelegate(self, queue: DispatchQueue.main)
 
         callKitProvider.setDelegate(self, queue: nil)
         _ = updateCallKitIcon(icon: defaultIcon)
@@ -537,6 +541,22 @@ public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHand
             completion()
         }
     }
+
+    // MARK: CXCallObserverDelegate
+    public func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) {
+        let uuid = call.uuid
+
+        if call.hasEnded {
+            activeCalls.removeValue(forKey: uuid) // Remove ended calls
+        } else {
+            activeCalls[uuid] = call // Add or update call
+        }
+    }
+    
+    // Check if a call with a given UUID exists
+    func isCallActive(uuid: UUID) -> Bool {
+        return activeCalls[uuid] != nil
+    }
 
     func incomingPushHandled() {
         if let completion = self.incomingPushCompletionCallback {
@@ -890,6 +910,13 @@ public class SwiftTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStreamHand
 
         self.sendPhoneCallEvents(description: "LOG|performEndCallAction method invoked", isError: false)
 
+        // check if call is still active, preventing a race condition ending the call throwing an End Call Failed transaction error 4 error
+        guard isCallActive(uuid: uuid) else {
+            print("Call not found or already ended. Skipping end request.")
+            self.sendPhoneCallEvents(description: "Call Ended", isError: false)
+            return
+        }
+        
         let endCallAction = CXEndCallAction(call: uuid)
         let transaction = CXTransaction(action: endCallAction)