viewdidappear

Unable to set frame correctly before viewDidAppear

viewDidLoad is called when the class is loaded however no ui elements have been initialised and therefore any attempt to reference them will be overwritten or unavaliable during the initialisation process which happens between the viewDidLoad and viewDidAppear calls. Once all ui element have been initalised and drawn viewDidAppear is called. viewDidLoad – Called after … Read more

How to do some stuff in viewDidAppear only once?

There is a standard, built-in method you can use for this. Objective-C: – (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; if ([self isBeingPresented] || [self isMovingToParentViewController]) { // Perform an action that will only be done once } } Swift 3: override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) if self.isBeingPresented || self.isMovingToParentViewController { // Perform an action that … Read more