Question

Specifically, what am I supposed to do with the view that is now hidden after pushing on a new view controller?
In my situation I have a view with animations going on, that continue to execute after the view is off screen.

Is there some accepted convention? Do I remove the View Controller and View from memory?
Does Cocoa Touch have a convenient method to ‘Pause’ a view (and controller) and remove it from memory, and bring it back into existence when needed (after a pop)? Do I have to archive it myself and then un-archive it?

Are there any examples you can point me to?

Thanks

Answer 1

Under low memory conditions, your controller’s ‘view’ property will automatically be set to nil, if it’s not on screen. Then the view will automatically load again when it is needed – and viewDidLoad should get called at that time.

If your view controller is retaining any subviews of the top-level view, then you may want to override the view controller’s setView: method, check if the view is being set to nil, and if so, release subviews that you were retaining. Otherwise, the top-level view may never get deallocated.

- (void)setView:(UIView *)view {     [super setView:view];     if (view == nil)     {         // Release other views         // self.someView = nil;     } }