iOS: different addSubview behavior between iOS 4.3 and 5.0

Question

while coding in iOS 4.3 before, I found while add a view controller\'s view to another view with [superview addSubView:controller.view], the controller instance wil

Answer 1

This may not be an answer what you want, but I had same kind of problem.

In my case, when I added a view controller's view to another view controller's view as a subview, the subview was received viewWillAppear only in iOS 5.0 not iOS 4.X.

So I added a nasty condition.

[self.view addSubview:self.viewController.view];
if ([[[UIDevice currentDevice] systemVersion] compare:@"5.0"] == NSOrderedAscending) {
    [self.viewController viewWillAppear:animated];
}

From iOS 5.0, Apple provides a way to implement custom container view controllers like UINavigationController or UITabController. I think this change affects when viewWillAppear is called.

This problem may be solvable if we use -[UIViewController addChildViewController:].