[iOS] Add support for answering incoming call

Author: dtsolis

index.js

@@ -87,9 +87,7 @@ class RNCallKeep {
   };
 
   answerIncomingCall = (uuid) => {
-    if (!isIOS) {
-      RNCallKeepModule.answerIncomingCall(uuid);
-    }
+    RNCallKeepModule.answerIncomingCall(uuid);
   };
 
   startCall = (uuid, handle, contactIdentifier, handleType = 'number', hasVideo = false ) => {

ios/RNCallKeep/RNCallKeep.m

@@ -205,6 +205,19 @@ + (void)initCallKitProvider {
     [self requestTransaction:transaction];
 }
 
+RCT_EXPORT_METHOD(answerIncomingCall:(NSString *)uuidString)
+{
+#ifdef DEBUG
+    NSLog(@"[RNCallKeep][answerCall] uuidString = %@", uuidString);
+#endif
+    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:uuidString];
+    CXAnswerCallAction *answerCallAction = [[CXAnswerCallAction alloc] initWithCallUUID:uuid];
+    CXTransaction *transaction = [[CXTransaction alloc] init];
+    [transaction addAction:answerCallAction];
+
+    [self requestTransaction:transaction];
+}
+
 RCT_EXPORT_METHOD(endCall:(NSString *)uuidString)
 {
 #ifdef DEBUG