Question

我正试图以这种方式从app delegate .m加载UIStoryboard：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{    
    UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:[NSBundle mainBundle]];
    UIViewController *vc =[storybord instantiateInitialViewController];
    [self.window addSubview:vc.view];

    return YES;
}

这段代码有什么问题？任何的想法？

Answer 1

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:[NSBundle mainBundle]];
   UIViewController *vc =[storyboard instantiateInitialViewController];

   // Set root view controller and make windows visible
   self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   self.window.rootViewController = vc;
   [self.window makeKeyAndVisible];

   return YES;
}

试试这个。我认为缺少设置根视图控制器并使窗口可见。

Answer 2

从您的代码中我看到UIWindow对象未初始化。如果您没有在App-Info.plist中提及任何故事板名称，则必须对其进行初始化。此外，使窗口键和可见。请更改您的代码，如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window=[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIStoryboard *storybord = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:[NSBundle mainBundle]];
UIViewController *vc =[storybord instantiateInitialViewController];
[self.window addSubview:vc.view];
[self.window makeKeyAndVisible];
return YES;
}

Answer 3

对于Swift 4.2及更高版本。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let storyboard = UIStoryboard(name: "YourStoryboardName", bundle: Bundle.main)
    let viewController = storyboard.instantiateInitialViewController()
    window?.rootViewController = viewController
    window?.makeKeyAndVisible()
    return true
}

Answer 4

现在这种方式不起作用。

在构建设置plist中，为Main Storyboard添加一个条目（或类似的东西）。 applicationDidFinishLoading中您需要的只是返回YES;

如果你开始一个带有故事板的新项目，你可以看到确切的条目。

当它在那里时你不需要加载初始视图，因为它从故事板文件（是初始视图标志）中获取它。

HTH

来自app delegate的UIStoryboard加载

4 个答案: