When using the alert format, print the log and terminate the calkeep process.

Author: cloudwebrtc

ios/Classes/CallKeep.m

@@ -232,8 +232,14 @@ - (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayloa
         "has_video": false,
     }
     */
+
     NSDictionary *dic = payload.dictionaryPayload;
 
+    if (dic[@"aps"] != nil) {
+        NSLog(@"Do not use the 'alert' format for push type %@.", payload.type);
+        return;
+    }
+
     NSString *uuid = dic[@"uuid"];
     NSString *callerId = dic[@"caller_id"];
     NSString *callerName = dic[@"caller_name"];