將iPad故事板添加到現有的iphone項目

Question

我爲iphone/ipod用戶創建了我的項目。現在我想讓它也適用於ipad用戶。我有2個故事板; 3.5英寸和4英寸。

這是我的步驟：

1）我創建了一個新的故事板。文件 - 新建文件 - 用戶界面 - Storyboard for iPad。

2）我將目標設備從iphone更改爲通用設備。

3）我在iPad部署信息部分設置了主要故事板。

4）最後，我複製了4英寸iphone的故事板上的所有內容，並將其粘貼到新的故事板上用於iPad。 （我沒有改變任何東西，包括屏幕尺寸）

我試圖在新的故事板上放一個視圖控制器，但結果是一樣的。

然後我運行並在iPad模擬器上構建了我的應用程序。我得到以下錯誤：

2013-07-28 19:02:42.151 Test[40038:12203] *** Terminating app due to uncaught 
exception 'NSInvalidArgumentException', reason: '-[ViewController topViewController]: 
unrecognized selector sent to instance 0x7888940' 
*** First throw call stack: 
(0x1b02012 0x1573e7e 0x1b8d4bd 0x1af1bbc 0x1af194e 0x252b 0x2626 0x4b5157 0x4b5747 
0x4b694b 0x4c7cb5 0x4c8beb 0x4ba698 0x194cdf9 0x194cad0 0x1a77bf5 0x1a77962 0x1aa8bb6 
0x1aa7f44 0x1aa7e1b 0x4b617a 0x4b7ffc 0x1d5d 0x1c85) 
libc++abi.dylib: terminate called throwing an exception 

這是AppDelegate.m

-(void)initializeStoryBoardBasedOnScreenSize { 

if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone) 
{ // The iOS device = iPhone or iPod Touch 


    CGSize iOSDeviceScreenSize = [[UIScreen mainScreen] bounds].size; 

    if (iOSDeviceScreenSize.height == 480) 
    { // iPhone 3GS, 4, and 4S and iPod Touch 3rd and 4th generation: 3.5 inch screen (diagonally measured) 

     // Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone35 
     UIStoryboard *iPhone35Storyboard = [UIStoryboard storyboardWithName:@"Storyboard_iphone35" bundle:nil]; 

     // Instantiate the initial view controller object from the storyboard 
     UIViewController *initialViewController = [iPhone35Storyboard instantiateInitialViewController]; 

     // Instantiate a UIWindow object and initialize it with the screen size of the iOS device 
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 

     // Set the initial view controller to be the root view controller of the window object 
     self.window.rootViewController = initialViewController; 

     // Set the window object to be the key window and show it 
     [self.window makeKeyAndVisible]; 
    } 

    if (iOSDeviceScreenSize.height == 568) 
    { // iPhone 5 and iPod Touch 5th generation: 4 inch screen (diagonally measured) 

     // Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone4 
     UIStoryboard *iPhone4Storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; 

     // Instantiate the initial view controller object from the storyboard 
     UIViewController *initialViewController = [iPhone4Storyboard instantiateInitialViewController]; 

     // Instantiate a UIWindow object and initialize it with the screen size of the iOS device 
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 

     // Set the initial view controller to be the root view controller of the window object 
     self.window.rootViewController = initialViewController; 

     // Set the window object to be the key window and show it 
     [self.window makeKeyAndVisible]; 
    } 

} else if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) 

{ // The iOS device = iPad 

    UISplitViewController *splitViewController = (UISplitViewController *)self.window.rootViewController; 
    UINavigationController *navigationController = [splitViewController.viewControllers lastObject]; 
    splitViewController.delegate = (id)navigationController.topViewController; 

} 
} 

會有人能夠解釋什麼是錯？

Answer 1

分割視圖控制器中的最後一個對象不是UINavigationController。檢查你的故事板。

UINavigationController *navigationController = [splitViewController.viewControllers lastObject]; 
splitViewController.delegate = (id)navigationController.topViewController;