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
- }
- }