UIActivityViewController White Tint.m

//Put this line in application did finish launching
[[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTintColor:[UIColor whiteColor]];
[[UIBarButtonItem appearance] setTintColor:[UIColor whiteColor]];
//Another option


//Also use this to prevent to Cancel button text on the popup to disappear
[activityController.view setTintColor:[UIColor redColor]];


//What is this
[[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];


//THis works too
UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:applicationActivities];

activityViewController.excludedActivityTypes = @[UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeAddToReadingList, UIActivityTypePostToVimeo, UIActivityTypePostToFlickr, UIActivityTypeAirDrop];

[activityViewController setCompletionHandler:^(NSString *activityType, BOOL completed) {
    // back to normal color
    [[UINavigationBar appearance] setBarTintColor:AAColorInputBorder];
    [[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                         [UIFont fontWithName:@"Avenir-Medium" size:18], NSFontAttributeName,
                                                         [UIColor whiteColor], NSForegroundColorAttributeName,
                                                         nil]];
}];

[self presentViewController:activityViewController animated:YES completion:^{
// change color temporary
[[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];
[[UINavigationBar appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                     [UIFont fontWithName:@"Avenir-Medium" size:18], NSFontAttributeName,
                                                     AAColorInputBorder, NSForegroundColorAttributeName,
                                                     nil]];
    
    
    

    
     [activityController setCompletionWithItemsHandler:^(NSString * __nullable activityType, BOOL completed, NSArray * __nullable returnedItems, NSError * __nullable activityError)
    {
        //Your Code goes here
//        [[UIBarButtonItem appearance] setTintColor:[UIColor blackColor]];
    }];