pragma mark ----只支持横屏

-(BOOL)shouldAutorotate{
return NO;
}

-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationLandscapeLeft;
}

• (UIInterfaceOrientationMask)supportedInterfaceOrientations
  {
  return UIInterfaceOrientationMaskLandscape;
  }

p 方法二

• (UIInterfaceOrientationMask)supportedInterfaceOrientations
  {
  return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
  }