Ignore the second JS dismiss event

The JS dismiss event is being sent to the SDK twice. Make sure we don't dismiss twice or the second IAM in the queue will be dismissed before it is displayed

Author: emawby

iOS_SDK/OneSignalSDK/OneSignalInAppMessages/Controller/OSMessagingController.m

@@ -738,7 +738,7 @@ - (void)messageViewControllerWasDismissed:(OSInAppMessageInternal *)message disp
             [self persistInAppMessageForRedisplay:showingIAM];
         }
         // Reset the IAM viewController to prepare for next IAM if one exists
-        [self cleanUpInAppWindow];
+        self.viewController = nil;
         // Reset time since last IAM
         [self setAndPersistTimeSinceLastMessage];
 

iOS_SDK/OneSignalSDK/OneSignalInAppMessages/UI/OSInAppMessageViewController.m

@@ -95,12 +95,15 @@ @interface OSInAppMessageViewController ()
 
 @implementation OSInAppMessageViewController
 
+OSInAppMessageInternal *_dismissingMessage = nil;
+
 - (instancetype _Nonnull)initWithMessage:(OSInAppMessageInternal *)inAppMessage delegate:(id<OSInAppMessageViewControllerDelegate>)delegate {
     if (self = [super init]) {
         self.message = inAppMessage;
         self.delegate = delegate;
         self.useHeightMargin = YES;
         self.useWidthMargin = YES;
+        _dismissingMessage = nil;
     }
 
     return self;
@@ -490,6 +493,10 @@ - (void)dismissCurrentInAppMessage:(BOOL)up withVelocity:(double)velocity {
         [self.delegate messageViewControllerWasDismissed:self.message displayed:NO];
         return;
     }
+    
+    if (_dismissingMessage == self.message) {
+        return;
+    }
 
     [self.delegate messageViewControllerWillDismiss:self.message];
 
@@ -521,7 +528,7 @@ - (void)dismissCurrentInAppMessage:(BOOL)up withVelocity:(double)velocity {
         animationOption = UIViewAnimationOptionCurveEaseIn;
         dismissAnimationDuration = MIN_DISMISSAL_ANIMATION_DURATION;
     }
-
+    _dismissingMessage = self.message;
     [UIView animateWithDuration:dismissAnimationDuration delay:0.0f options:animationOption animations:^{
         self.view.backgroundColor = [UIColor clearColor];
         self.view.alpha = 0.0f;