Fixed stability with alerts when enable visual logging level.

* Ensuring that debug alerts are run from the main thread when enabled.
   - This fixes errors with NSInternalInconsistencyException.

Author: jkasten2

iOS_SDK/OneSignal/OneSignal.m

@@ -283,12 +283,14 @@ void onesignal_Log(ONE_S_LOG_LEVEL logLevel, NSString* message) {
         NSLog(@"%@", [levelString stringByAppendingString:message]);
 
     if (logLevel <= _visualLogLevel) {
-        UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:levelString
-                                                            message:message
-                                                           delegate:nil
-                                                  cancelButtonTitle:@"Close"
-                                                  otherButtonTitles:nil, nil];
-        [alertView show];
+        [OneSignalHelper runOnMainThread:^{
+            UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:levelString
+                                                                message:message
+                                                               delegate:nil
+                                                      cancelButtonTitle:@"Close"
+                                                      otherButtonTitles:nil, nil];
+            [alertView show];
+        }];
     }
 }
 

iOS_SDK/OneSignal/OneSignalHelper.h

@@ -68,5 +68,8 @@
 + (void)enqueueRequest:(NSURLRequest*)request onSuccess:(OSResultSuccessBlock)successBlock onFailure:(OSFailureBlock)failureBlock isSynchronous:(BOOL)isSynchronous;
 + (void)handleJSONNSURLResponse:(NSURLResponse*) response data:(NSData*) data error:(NSError*) error onSuccess:(OSResultSuccessBlock)successBlock onFailure:(OSFailureBlock)failureBlock;
 
+// Threading
++ (void) runOnMainThread:(void(^)())block;
+
 #pragma clang diagnostic pop
 @end

iOS_SDK/OneSignal/OneSignalHelper.m

@@ -690,7 +690,7 @@ + (void)addnotificationRequest:(NSDictionary *)data userInfo:(NSDictionary *)use
     if (!NSClassFromString(@"UNUserNotificationCenter"))
         return;
 
-    dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
         [OneSignalHelper beginBackgroundMediaTask];
         id notificationRequest = [OneSignalHelper prepareUNNotificationRequest:data :userInfo];
         [[NSClassFromString(@"UNUserNotificationCenter") currentNotificationCenter] addNotificationRequest:notificationRequest withCompletionHandler:^(NSError * _Nullable error) {}];
@@ -846,6 +846,13 @@ + (void) displayWebView:(NSURL*)url {
 
 }
 
++ (void) runOnMainThread:(void(^)())block {
+    if ([NSThread isMainThread])
+        block();
+    else
+        dispatch_sync(dispatch_get_main_queue(), block);
+}
+
 #pragma clang diagnostic pop
 #pragma clang diagnostic pop
 #pragma clang diagnostic pop