Keyboard issue with iOS 4.2

My app works as supposed on an iPhone running iOS 4.1 but not on iOS 4.2. I have an UIInputField set to first res开发者_运维问答ponder but the keyboard does not show up. The becomeFirstResponder is called in the viewDidLoad method. Is it a bug or has Apple made drastic changes? I'm using Xcode 3.2.5.

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Does the input field have User Interaction Enabled? This is now required in iOS 4.2.

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-viewDidLoad is called when your view is first initialized, not necessarily when it's displayed. Try calling -becomeFirstResponder inside -viewDidAppear: instead:

 - (void)viewDidAppear:(BOOL)animated {
     [super viewDidAppear:animated];

     [myField becomeFirstResponder];
 }

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Found a thread at the Apple Developer Forums (https://devforums.apple.com/message/325348#325348) where a solution was described. Set the UITextField property userInteractionEnabled to YES before a call to becomeFirstResponder is made, preferably in the viewDidLoad method.