Unable to set frame correctly before viewDidAppear

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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 the controller’s view is loaded into memory

At this point the view isn’t within the view hierarchy.

viewWillAppear – Notifies the view controller that its view is about to be added to a view hierarchy.

Again, the view is yet to be added to the view hierarchy.

viewDidAppear – Notifies the view controller that its view was added to a view hierarchy.

Only then is the view added to the view hierarchy.

Update

The viewDidLayoutSubviews is the most appropriate place to modify the UI before it actually appears on the screen.

viewDidLayoutSubviews – Notifies the view controller that its view just laid out its subviews.

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