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我为 iphone/ipod 用户创建了我的项目。现在我想让它也适用于 ipad 用户。我有 2 个故事板；3.5 英寸和 4 英寸。

这是我的步骤：

1）我创建了一个新的故事板。文件 - 新文件 - 用户界面 - iPad 故事板。

2）我将目标设备从 iphone 更改为通用。

3）我在 iPad 部署信息部分设置了主故事板。

4）最后，我复制了 4 英寸 iPhone 故事板上的所有内容，并将其粘贴到 ipad 的新故事板上。（我没有改变任何东西，包括屏幕尺寸）

我试图在新的故事板上只放一个视图控制器，但结果是一样的。

然后我在 iPad 模拟器上运行并构建了我的应用程序。我在下面得到一个错误：

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

这是在 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;

}
}

谁能解释什么是错的？

4

1 回答 1

1

拆分视图控制器中的最后一个对象不是 UINavigationController。检查你的故事板。

UINavigationController *navigationController = [splitViewController.viewControllers lastObject];
splitViewController.delegate = (id)navigationController.topViewController;
于 2013-07-28T16:43:40.633 回答