的iOS AppDelegate中添加supportedInterfaceOrientationsForWindow

Question

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window 
{ 
    NSUInteger orientations = UIInterfaceOrientationMaskPortrait; 
    if (self.fullScreenVideoIsPlaying == YES) 
    { 
     return UIInterfaceOrientationMaskAllButUpsideDown; 
    } 
    else 
    { 
     if(self.window.rootViewController) 
     { 
      UIViewController *presentedViewController = [[(UINavigationController *)self.window.rootViewController viewControllers] lastObject]; 
      orientations = [presentedViewController supportedInterfaceOrientations]; 
     } 
     return orientations; 
    } 
} 

我试图改变屏幕的方向只有一个页面，我当我启动程序添加此功能，程序无法启动，给这个错误初始屏幕 错误：

2015-02-06 00:40:24.264 AppName[5002:1189245] -[SplashScreen viewControllers]: unrecognized selector sent to instance 0x14d510010 
2015-02-06 00:40:24.266 AppName[5002:1189245] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SplashScreen viewControllers]: unrecognized selector sent to instance 0x14d510010' 
*** First throw call stack: 
(0x18269659c 0x192da00e4 0x18269d664 0x18269a418 0x18259eb6c 0x100098614 0x186ebc594 0x186ebc210 0x186ec548c 0x186ec4ee0 0x186ebc154 0x1870d45f0 0x1870d362c 0x1870d1dec 0x18a90d62c 0x18264ea28 0x18264db30 0x18264bd30 0x1825790a4 0x186eb33c8 0x186eae3c0 0x100102560 0x19340ea08) 
libc++abi.dylib: terminating with uncaught exception of type NSException 

任何想法??我该如何解决这个问题？

Answer 1

也许你想改变viewControllers到childViewControllers

编辑1：对不起，我现在才发现，你认为你的rootViewController是UINavigationViewController。

这显然不是你可以从错误信息中看到的。它是类的SplashScreen

编辑2：我建议你做以下，并从那里

if(self.window.rootViewController && [self.window.rootViewController isKindOfClass:[UINavigationViewController class]]) 
{ 
     UIViewController *presentedViewController = [[(UINavigationController *)self.window.rootViewController viewControllers] lastObject]; 
     orientations = [presentedViewController supportedInterfaceOrientations]; 
} 

return orientations;