完美处理弹出键盘，界面上移功能

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     1.   定义  

int          m_curKeyboardHeight;

     在init函数中  设置为 m_curKeyboardHeight =0;

   2. 在init中  注册两个通知

    

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

      在dealloc中，注销这两个通知：

      

        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];

        [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

     3. 通知响应函数 的定义以及实现。

      假设  输入框为  

UITextField     *  m_inputField;

- (void)keyboardWillShow:(NSNotification *)aNotification;

- (void)keyboardWillHide:(NSNotification *)aNotification;

    

- (void)keyboardWillShow:(NSNotification *)aNotification

{

    if ([m_inputField isFirstResponder] == NO)

    {

        return;

    }

    

    

    CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];

    

    NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    CGRect bottomframe = m_bottomImage.frame;

    bottomframe.origin.y -= keyboardRect.size.width - m_curKeyboardHeight;

    

    CGRect fieldframe = m_inputField.frame;

    fieldframe.origin.y -= keyboardRect.size.width - m_curKeyboardHeight;

    

   

    

    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];

    [UIView setAnimationDuration:animationDuration];

    m_bottomImage.frame = bottomframe;

    m_inputField.frame = fieldframe;

    [UIView commitAnimations];

    

    

    

    m_curKeyboardHeight = keyboardRect.size.width;

}

- (void)keyboardWillHide:(NSNotification *)aNotification

{

    if ([m_inputField isFirstResponder] == NO)

    {

        return;

    }

    

    NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    

    CGRect bottomframe = m_bottomImage.frame;

    bottomframe.origin.y += m_curKeyboardHeight;

    

    CGRect fieldframe = m_inputField.frame;

    fieldframe.origin.y+= m_curKeyboardHeight;

    

    

    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];

    [UIView setAnimationDuration:animationDuration];

    m_bottomImage.frame = bottomframe;

    m_inputField.frame = fieldframe;

    [UIView commitAnimations];

    

    m_curKeyboardHeight = 0;

}

  

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