在目标c中点击文本字段时的键盘移动

Question

我使用以下代码在点击文本字段时返回键盘。 当我用UIKeyboardBoundsUserInfoKey替换UIKeyboardFrameBeginUserInfoKey时，因为旧版本显示警告它已在xcode4中弃用。

它是否适用于iOS 3设备，因为它是iOS sdk 4的新API？

 -(void)keyboardWasShown:(NSNotification *)aNotification {
if ( keyboardShown )
    return;

if ( (activeField==tfNet)||(activeField==tfSync)||(activeField==tfFqone)||(activeField==tfFqtwo)||(activeField==tfFqthree)||(activeField==tfFqfour)||(activeField==tfFqfive)||(activeField==tfLqone)||(activeField==tfLqtwo)||(activeField==tfLqthree)||(activeField==tfLqfour)||(activeField==tfLqfive))
{


#if __IPHONE_OS_VERSION_MIN_REQUIRED <= __IPHONE_3_2
    CGRect _keyboardEndFrame;
    [[aNotification.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue:&_keyboardEndFrame];
    CGFloat keyboardSize;
    if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) 
    {
        keyboardSize = _keyboardEndFrame.size.height;
    }
    else {
        keyboardSize = _keyboardEndFrame.size.width;
    }

    NSTimeInterval animationDuration = 0.300000011920929;
    CGRect frame = self.view.frame;
    frame.origin.y -= keyboardSize-8;
    frame.size.height += keyboardSize-8;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame = frame;
    [UIView commitAnimations];
#else
    NSDictionary *info = [aNotification userInfo];
    //NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
    NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
    CGSize keyboardSize = [aValue CGRectValue].size;

    NSTimeInterval animationDuration = 0.300000011920929;
    CGRect frame = self.view.frame;
    frame.origin.y -= keyboardSize.height-8;
    frame.size.height += keyboardSize.height-8;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame = frame;
    [UIView commitAnimations];

#endif

    viewMoved = YES;
}

keyboardShown = YES;
}

- (void)keyboardWasHidden:(NSNotification *)aNotification {

if ( viewMoved ) {

#if __IPHONE_OS_VERSION_MIN_REQUIRED <= __IPHONE_3_2
    CGRect _keyboardEndFrame;
    [[aNotification.userInfo valueForKey:UIKeyboardFrameEndUserInfoKey] getValue:&_keyboardEndFrame];
    CGFloat keyboardSize;
    if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) {
        keyboardSize = _keyboardEndFrame.size.height;
    }
    else {
        keyboardSize = _keyboardEndFrame.size.width;
    }

    NSTimeInterval animationDuration = 0.300000011920929;
    CGRect frame = self.view.frame;
    frame.origin.y += keyboardSize-8;
    frame.size.height -= keyboardSize-8;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame = frame;
    [UIView commitAnimations];
#else
    NSDictionary *info = [aNotification userInfo];
    NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];
    CGSize keyboardSize = [aValue CGRectValue].size;

    NSTimeInterval animationDuration = 0.300000011920929;
    CGRect frame = self.view.frame;
    frame.origin.y += keyboardSize.height-8;
    frame.size.height -= keyboardSize.height-8;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame = frame;
    [UIView commitAnimations];
#endif

    viewMoved = NO;
}

keyboardShown = NO;
}