iOS 屏幕旋转控制

/** 屏幕旋转控制 allowRotateType ==(0_{强制竖屏，1}横竖屏，2~强制横屏 )*/

• (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
  {
  if (allowRotateType == 1) {
  return UIInterfaceOrientationMaskLandscape;
  }
  return UIInterfaceOrientationMaskPortrait;
  }