调用equals（“”）;(Calling equals(“”); by itself compiles and runs)

 我会假设你在这里瞄准iOS 7（使用XCode 5.1，我认为我是对的）。 
 
 首先，你必须明白，为了打开超过40个景观中的一个视图，你的应用应该允许横向和纵向的界面方向。 默认情况下是这样，但您可以在您的目标设置， General选项卡， Deployment Info部分中查看它（请参阅下面的屏幕截图）。 
 
 
 然后，因为您允许横向和纵向整个应用程序，您将不得不告诉每个只有纵向的UIViewController ，它不应该自动旋转，添加此方法的实现： 
 
- (BOOL)shouldAutorotate {
  return NO;
}
 
 最后，对于您的特定景观专用控制器，并且因为您说您以模态方式呈现它，您可以只实现这些方法： 
 
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
  return UIInterfaceOrientationLandscapeLeft; // or Right of course
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
  return UIInterfaceOrientationMaskLandscape;
}
 
 希望这会有所帮助， 

I am gonna suppose you are targeting iOS 7 here (using XCode 5.1, I think I am right).
 
First, you have to understand that in order to open even just one view out of over 40 in landscape, your app should allow both landscape and portrait interface orientations. It is the case by default, but you can check it in your target's settings, General tab, Deployment Info section (see screenshot below).
 
 
Then, because you allowed both landscape and portrait for the entire app, you will have to tell every portrait-only UIViewController that it should not autorotate, adding this method's implementation:
 
- (BOOL)shouldAutorotate {
  return NO;
}
 
Finally, for your specific landscape-only controller, and because you said you are presenting it modally, you can just implement these methods:
 
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
  return UIInterfaceOrientationLandscapeLeft; // or Right of course
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
  return UIInterfaceOrientationMaskLandscape;
}
 
Hope this will help,