Add warnings to docs for threading, properly dispatch internally

Classes/BITAuthenticator.h

@@ -313,7 +313,7 @@ typedef NS_ENUM(NSUInteger, BITAuthenticatorAppRestrictionEnforcementFrequency)
  * @see authenticateInstallation
  * @see validateWithCompletion:
  *
- * @param completion Block being executed once identification completed
+ * @param completion Block being executed once identification completed. Be sure to properly dispatch code to the main queue if necessary.
  */
 - (void) identifyWithCompletion:(void(^)(BOOL identified, NSError *error)) completion;
 
@@ -342,7 +342,7 @@ typedef NS_ENUM(NSUInteger, BITAuthenticatorAppRestrictionEnforcementFrequency)
  * @see authenticateInstallation
  * @see identifyWithCompletion:
  *
- * @param completion Block being executed once validation completed
+ * @param completion Block being executed once validation completed. Be sure to properly dispatch code to the main queue if necessary.
  */
 - (void) validateWithCompletion:(void(^)(BOOL validated, NSError *error)) completion;
 

Classes/BITAuthenticator.m

@@ -246,7 +246,9 @@ static unsigned char kBITPNGEndChunk[4] = {0x49, 0x45, 0x4e, 0x44};
   viewController.email = [self stringValueFromKeychainForKey:kBITAuthenticatorUserEmailKey];
   _authenticationController = viewController;
   _identificationCompletion = completion;
+  dispatch_async(dispatch_get_main_queue(), ^{
     [self showView:viewController];
+  });
 }
 
 #pragma mark - Validation

Classes/BITFeedbackManager.h

@@ -287,6 +287,8 @@ typedef NS_ENUM(NSInteger, BITFeedbackObservationMode) {
 
 /**
  Present the modal feedback list user interface.
+ 
+ @warning This methods needs to be called on the main thread!
  */
 - (void)showFeedbackListView;
 
@@ -303,6 +305,8 @@ typedef NS_ENUM(NSInteger, BITFeedbackObservationMode) {
 
 /**
  Present the modal feedback compose message user interface.
+ 
+ @warning This methods needs to be called on the main thread!
  */
 - (void)showFeedbackComposeView;
 
@@ -314,6 +318,7 @@ typedef NS_ENUM(NSInteger, BITFeedbackObservationMode) {
  
  @param items an NSArray with objects that should be attached
  @see `[BITFeedbackComposeViewController prepareWithItems:]`
+ @warning This methods needs to be called on the main thread!
  */
 - (void)showFeedbackComposeViewWithPreparedItems:(NSArray *)items;
 
@@ -325,6 +330,7 @@ typedef NS_ENUM(NSInteger, BITFeedbackObservationMode) {
      [[BITHockeyManager sharedHockeyManager].feedbackManager showFeedbackComposeViewWithGeneratedScreenshot];
  
  @see feedbackObservationMode
+ @warning This methods needs to be called on the main thread!
  */
 - (void)showFeedbackComposeViewWithGeneratedScreenshot;
 

Classes/BITFeedbackManager.m

@@ -220,8 +220,9 @@ NSString *const kBITFeedbackUpdateAttachmentThumbnail = @"BITFeedbackUpdateAttac
     BITHockeyLog(@"INFO: update view already visible, aborting");
     return;
   }
-  
+  dispatch_async(dispatch_get_main_queue(), ^{
     [self showView:[self feedbackListViewController:YES]];
+  });
 }
 
 
@@ -246,9 +247,9 @@ NSString *const kBITFeedbackUpdateAttachmentThumbnail = @"BITFeedbackUpdateAttac
   }
   BITFeedbackComposeViewController *composeView = [self feedbackComposeViewController];
   [composeView prepareWithItems:items];
-  
+  dispatch_async(dispatch_get_main_queue(), ^{
     [self showView:composeView];
-  
+  });
 }
 
 - (void)showFeedbackComposeViewWithGeneratedScreenshot {

Classes/BITHockeyBaseManager.m

@@ -258,7 +258,6 @@
   // if we compile Crash only, then BITHockeyBaseViewController is not included
   // in the headers and will cause a warning with the modulemap file
 #if HOCKEYSDK_FEATURE_AUTHENTICATOR || HOCKEYSDK_FEATURE_UPDATES || HOCKEYSDK_FEATURE_FEEDBACK
-  dispatch_async(dispatch_get_main_queue(), ^{
     UIViewController *parentViewController = [self visibleWindowRootViewController];
     
     // as per documentation this only works if called from within viewWillAppear: or viewDidAppear:
@@ -295,7 +294,6 @@
         [(BITHockeyBaseViewController *)viewController setModalAnimated:NO];
       [visibleWindow addSubview:_navController.view];
     }
-  });
 #endif /* HOCKEYSDK_FEATURE_AUTHENTICATOR || HOCKEYSDK_FEATURE_UPDATES || HOCKEYSDK_FEATURE_FEEDBACK */
 }
 #endif // HOCKEYSDK_CONFIGURATION_ReleaseCrashOnlyExtensions && HOCKEYSDK_CONFIGURATION_RelaseCrashOnlyWatchOS

Classes/BITUpdateManager.h

@@ -220,6 +220,8 @@ typedef NS_ENUM (NSUInteger, BITUpdateSetting) {
 
 /**
  Present the modal update user interface.
+ 
+ @warning Make sure to call this method from the main thread!
  */
 - (void)showUpdateView;
 

Classes/BITUpdateManager.m

@@ -545,7 +545,9 @@ typedef NS_ENUM(NSInteger, BITUpdateAlertViewTag) {
   if ([self hasNewerMandatoryVersion] || [self expiryDateReached]) {
     [updateViewController setMandatoryUpdate: YES];
   }
+  dispatch_async(dispatch_get_main_queue(), ^{
     [self showView:updateViewController];
+  });
 }