How to check if a specific UIViewController's view is currently visible? [duplicate]

Answer 1

Just for completeness, I thought I'd add in how to determine if the view controller is being displayed in a tab based app:

+(BOOL) isSelectedViewController:(UIViewController *)someVC;
{
    myAppDelegate   *appD = [[UIApplication sharedApplication] delegate];
    UIViewController *selectedVC = [appD.TabBarController selectedViewController];

    return selectedVC == someVC;
}