Is there a NSNotification for objects that become first resoponder?

Is ther开发者_运维百科e a NSNotification for objects that become first responder. Like NSNotification that give me the UITextfield that cause the keyboard to pop up?

Check UITextFieldTextDidBeginEditingNotification, the textField that started editing is in notification's object property.

There're also UIKeyboardWillShowNotification and UIKeyboardDidShowNotification notifications

Another option is to have your view controller be a delegate to the UITextField. UITextFieldDelegate has a textFieldDidBeginEditing: method.

No, But you could check it manually by using "IsFirstResponder" (BOOL).. Can you explain a little bit more what you want to accomplish? Maybe there is a way to use another notification.