iOS5中当键盘输入法切换到中文时，键盘高度由216增加到252像素。这一变化将遮住输入框。如何才能解决这一问题呢？

      在iOS5中，新增有notification（UIKeyboardWillChangeFrameNotification）可以用来监测键盘frame的变化。在iOS4中，可以通过UIKeyboardWillShowNotification以及UIKeyboardWillHideNotification来监测键盘的显示与隐藏事件。综合处理下，可以用以下方法解决：

#ifndef IOS_VERSION  #define IOS_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]  #endif

在viewdidload中注册监测事件：

if (IOS_VERSION < 5.0) {      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillShowNotification object:nil];      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillHideNotification object:nil];  }else{      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];  }

在dealloc中移除监测事件：

if (IOS_VERSION < 5.0) {      [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];      [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];  }else{      [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillChangeFrameNotification object:nil];  }

事件处理函数：

- (void)keyboardWillChangeFrame:(NSNotification *)notification{      if(!isDisplayFaceBox){  #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2          if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {  #endif  #if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_3_2              NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];  #else              NSValue *keyboardBoundsValue = [[notification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey];  #endif              CGRect keyboardBounds;              [keyboardBoundsValue getValue:&keyboardBounds];              //UIEdgeInsets e = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0);              //[keyboardScrollView setScrollIndicatorInsets:e];              //[keyboardScrollView setContentInset:e];                            NSInteger offset = 480-keyboardBounds.origin.y;              CGRect listFrame = CGRectMake(0, offset, 320, 377-offset);                            [UIView beginAnimations:@"anim" context:NULL];              [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];              [UIView setAnimationBeginsFromCurrentState:YES];              [UIView setAnimationDuration:0.3];              //处理移动事件，将各视图设置最终要达到的状态              [tableviewbo setFrame:listFrame];                            faceButton.hidden = NO;              keyboardButton.hidden = YES;                                [keyboardScrollView setContentOffset:CGPointMake(0, offset) animated:NO];                            [self scrollToBottomAnimated:NO];                            [UIView commitAnimations];                #if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_3_2          }  #endif      }  }

原文地址：http://blog.csdn.net/zengconggen/article/details/7071086