显示或隐藏键盘改变tableView高度

- (void)registerKeybordNotification

 {

     NSNotificationCenter *notification = [NSNotificationCenter defaultCenter];

     [notification removeObserver:self];

     

     [notification addObserver:self

                      selector:@selector(showKeyboard:)

                          name:UIKeyboardWillShowNotification

                        object:nil];

     

     [notification addObserver:self

                      selector:@selector(hideKeyboard:)

                          name:UIKeyboardWillHideNotification

                        object:nil];

     

 #ifdef __IPHONE_5_0

     // 5.0以上系统中文键盘高度与4.0系统不一样

     float version = [[[UIDevice currentDevice] systemVersion] floatValue];

     if (version >= 5.0) {

         [notification addObserver:self

                          selector:@selector(showKeyboard:)

                              name:UIKeyboardWillChangeFrameNotification

                            object:nil];

     }

 #endif

 }


 - (void)showKeyboard:(NSNotification *)notification

 {

     NSDictionary *userInfo = [notification userInfo];

     NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

     CGFloat keyboardHeight = CGRectGetHeight([aValue CGRectValue]);

     CGFloat height = CGRectGetHeight(self.view.frame) - self.barHeight - keyboardHeight;

     

     /* 使用动画效果，过度更加平滑 */

     [UIView beginAnimations:nil context:nil];

     [UIView setAnimationDuration:0.1];

     {

         CGRect rect = _tableView.frame;

         rect.size.height = height;

         _tableView.frame = rect;

     }

     [UIView commitAnimations];

 }


 - (void)hideKeyboard:(NSNotification *)notification

 {

     [UIView beginAnimations:nil context:nil];

     [UIView setAnimationDuration:0.1];

     {

         CGRect rect = _tableView.frame;

         rect.size.height = CGRectGetHeight(self.view.frame) - self.barHeight;

         _tableView.frame = rect;

     }

     [UIView commitAnimations];

 }