Sha*_*hay 0 iphone notifications uitextfield first-responder uikeyboard
对于成为第一响应者的对象是否存在NSNotification.像NSNotification那样给我带来键盘弹出的UITextfield？
检查UITextFieldTextDidBeginEditingNotification,开始编辑的textField是否在通知的object属性中.
还有就是也UIKeyboardWillShowNotification和UIKeyboardDidShowNotification通知