In IOS 4.x or lower, viewDidAppear method is not getting called while adding subview to a view, why?

Question

In iOS 4.x or lower, viewDidAppear and viewWillAppear, viewDidDisappear and viewWillDisappear, such ViewController\'s delegate methods are not getting called. The same metho

Answer 1

For IOS4.x i use the UINavigationController delegate methods like this:

-(void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (SYSTEM_VERSION_LESS_THAN(@"5.0")) {
        [activeView viewDidAppear:YES];
    }
}
-(void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (SYSTEM_VERSION_LESS_THAN(@"5.0")) {
        [activeView viewWillAppear:YES];
    }
}

I hope this helps!

Answer 2

If your view controller is a child of another view controller, (i.e. it's a UINavigationController inside a UIViewController, or vice versa, etc.), the child's viewDidAppear, viewWillAppear, etc. methods will not get called. The solution is to have the parent call into them like:

-(void)viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:animated];
    [child viewWillAppear:animated];
}

I know this happens through iOS 4.3. In iOS 5 there is a new set of methods specifically for handling these cases: Implementing a Container View Controller