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：

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1. #ifndefIOS_VERSION
2. #defineIOS_VERSION[[[UIDevicecurrentDevice]systemVersion]floatValue]
3. #endif

在viewdidload中注册监测事件：

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1. if(IOS_VERSION<5.0){
2. [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillShowNotificationobject:nil];
3. [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillHideNotificationobject:nil];
4. }else{
5. [[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillChangeFrame:)name:UIKeyboardWillChangeFrameNotificationobject:nil];
6. }

在dealloc中移除监测事件：

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1. if(IOS_VERSION<5.0){
2. [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillShowNotificationobject:nil];
3. [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillHideNotificationobject:nil];
4. }else{
5. [[NSNotificationCenterdefaultCenter]removeObserver:selfname:UIKeyboardWillChangeFrameNotificationobject:nil];
6. }

事件处理函数：

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1. -(void)keyboardWillChangeFrame:(NSNotification*)notification{
2. if(!isDisplayFaceBox){
3. #if__IPHONE_OS_VERSION_MAX_ALLOWED>=__IPHONE_3_2
4. if(UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPhone){
5. #endif
6. #if__IPHONE_OS_VERSION_MIN_REQUIRED>=__IPHONE_3_2
7. NSValue*keyboardBoundsValue=[[notificationuserInfo]objectForKey:UIKeyboardFrameEndUserInfoKey];
8. #else
9. NSValue*keyboardBoundsValue=[[notificationuserInfo]objectForKey:UIKeyboardBoundsUserInfoKey];
10. #endif
11. CGRectkeyboardBounds;
12. [keyboardBoundsValuegetValue:&keyboardBounds];
13. //UIEdgeInsetse=UIEdgeInsetsMake(0,0,keyboardBounds.size.height,0);
14. //[keyboardScrollViewsetScrollIndicatorInsets:e];
15. //[keyboardScrollViewsetContentInset:e];
17. NSIntegeroffset=480-keyboardBounds.origin.y;
18. CGRectlistFrame=CGRectMake(0,offset,320,377-offset);
20. [UIViewbeginAnimations:@"anim"context:NULL];
21. [UIViewsetAnimationCurve:UIViewAnimationCurveEaseInOut];
22. [UIViewsetAnimationBeginsFromCurrentState:YES];
23. [UIViewsetAnimationDuration:0.3];
24. //处理移动事件，将各视图设置最终要达到的状态
25. [tableviewbosetFrame:listFrame];
27. faceButton.hidden=NO;
28. keyboardButton.hidden=YES;
30. [keyboardScrollViewsetContentOffset:CGPointMake(0,offset)animated:NO];
32. [selfscrollToBottomAnimated:NO];
34. [UIViewcommitAnimations];
36. #if__IPHONE_OS_VERSION_MAX_ALLOWED>=__IPHONE_3_2
37. }
38. #endif
39. }
40. }