完美解决ios4与ios5输入框随键盘移动问题

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：

#ifndefIOS_VERSION
#defineIOS_VERSION[[[UIDevicecurrentDevice]systemVersion]floatValue]
#endif

在viewdidload中注册监测事件：

if(IOS_VERSION<5.0){
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillShowNotificationobject:nil];
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillHideNotificationobject:nil];
}else{
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillChangeFrameNotificationobject:nil];
}

在dealloc中移除监测事件：

if(IOS_VERSION<5.0){
[[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];
[[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];
}else{
[[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillChangeFrameNotificationobject: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=[[notificationuserInfo]objectForKey:UIKeyboardFrameEndUserInfoKey];
#else
NSValue*keyboardBoundsValue=[[notificationuserInfo]objectForKey:UIKeyboardBoundsUserInfoKey];
#endif
CGRectkeyboardBounds;
[keyboardBoundsValuegetValue:&keyboardBounds];
//UIEdgeInsetse=UIEdgeInsetsMake(0,0,keyboardBounds.size.height,0);
//[keyboardScrollViewsetScrollIndicatorInsets:e];
//[keyboardScrollViewsetContentInset:e];

NSIntegeroffset=480-keyboardBounds.origin.y;
CGRectlistFrame=CGRectMake(0,offset,320,377-offset);

[UIViewbeginAnimations:@"anim"context:NULL];
[UIViewsetAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIViewsetAnimationBeginsFromCurrentState:YES];
[UIViewsetAnimationDuration:0.3];
//处理移动事件，将各视图设置最终要达到的状态
[tableviewbosetFrame:listFrame];

faceButton.hidden=NO;
keyboardButton.hidden=YES;

[keyboardScrollViewsetContentOffset:CGPointMake(0,offset)animated:NO];

[selfscrollToBottomAnimated:NO];

[UIViewcommitAnimations];

#if__IPHONE_OS_VERSION_MAX_ALLOWED>=__IPHONE_3_2
}
#endif
}
}