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

It is iOS5 behavior:
viewWillAppear, viewDidAppear, ... are executed automatically after addSubView: for iOS5.
So for iOS5 no need to execute manually those methods as need for iOS<5.0.

The fix may be:

if ([[UIDevice currentDevice].systemVersion doubleValue] < 5.0) {
...execute viewWillAppear or other
}