问表视图的最后四行不会从键盘下方移出

EN

#define kOFFSET_FOR_KEYBOARD 42
-(void)viewMoveUp:(BOOL)moveUp{

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5]; 

    CGRect rect = self.view.frame;
    if (moveUp)
    {
        rect.origin.y -= kOFFSET_FOR_KEYBOARD;
        rect.size.height +=  kOFFSET_FOR_KEYBOARD;
    }
    else
    {
        // revert back to the normal state.
        rect.origin.y = 0;
        rect.size.height =  360;
    }
    self.view.frame = rect;

    [UIView commitAnimations]; 


}