UIViewController multiple UIView

Question

This is just to confirm my solution: I have two UIView that I would like to swap between controlled by the UIViewController

In IB I have created 3 UIViews: TopView A_View B_View

Then in ViewDidLoad I add [

[self addSubView] A_View];

Then in some IBAction method I do this

[A_View removeFromSuperview];
[self.view addSubview:B_View];

This is indeed swapping the two views, with TopView just sitting there. But my first thought was just to call [[self view] removeFromSuperView]]; and then add B_view. This gives me an empty screen?

So is my solution the right way?

Thanks in advance Regards Christian

Answer 1

Looks fine to me. It's a pretty normal swapping style, just remove one and add the other.

You should always watch out with modifying the UIViewController's view itself. Your solution is fine.

Answer 2

That way is fine and perfectly straightforward.

If you're on iOS 4.0 or later, you can also use the transitionFromView:toView:duration:options:completion: method in UIView, which removes and adds for you, plus provides a transition animation.

The reason [[self view] removeFromSuperview] left you with a blank window is because you're removing your controller's base view object (including it's subviews, e.g. Top_View, etc) from it's superview (likely the window object). Your solution works when you remove A_View and add B_View, as both are being added or removed as subviews to your controller's view, i.e. self.view.