iOS自动旋转问题

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{   return (toInterfaceOrientation == UIInterfaceOrientationPortrait);    
}

- (BOOL)shouldAutorotate
{    
  return NO;
 }
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{    
 return UIInterfaceOrientationMaskPortrait;//只支持这一个方向(正常的方向)    
}