Question

我正在尝试学习this book，但所有示例都没有storyBoard，当我尝试构建应用程序时，我发现了这个错误：

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Application windows are expected to have a root view controller at the end of application launch'

我试着用它解决这个问题：

ViewController *myView = [[ViewController alloc] init];
[self.window addSubview:myView];
self.window.rootViewController = myView;

然后我收到了另一个错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[HypnoView _preferredInterfaceOrientationGivenCurrentOrientation:]: unrecognized selector sent to instance 0x78f68730'

有人可以向我解释为什么会发生这种情况吗？

Answer 1

首先你不能添加

UIViewController

作为子视图

方法

addSubview:(UIView *)

需要UIview并且您正在添加UIViewController。

其次，在iOS 4及更早版本中使用了添加子视图，现在，您将视图控制器添加为rootviewcontroller。

所以简单地添加，

self.window.rootViewController = myView

如果您想使用addSubview，则需要执行此操作

[self.window addSubView:myView.view]

Answer 2

转到AppDelegate.m

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
    self.window.rootViewController = self.viewController;
    return YES;
}

Answer 3

这样做了。转到AppDelegate.m并转到 - （BOOL）应用程序：（UIApplication *）application didFinishLaunchingWithOptions：（NSDictionary *）launchOptions

ViewController *myView = [[ViewController alloc] init];
self.window.rootViewController = myView;
[self.window makeKeyAndVisible];

如果要添加UIView作为子视图。然后执行以下操作：

UIView *view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.window makeKeyAndVisible];
[self.window addSubview:view];

Answer 4

<强>目标c

@interface AppDelegate () 
    @property (nonatomic, strong) ViewController *viewController;
@end


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

    [self setViewController:[[ViewController alloc] init]];

    [self setWindow:[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]];
    [[self window] setBackgroundColor:[UIColor redColor];
    [[self window] setRootViewController:[self viewController]];
    [[self window] makeKeyAndVisible];

    return YES;
}

<强>夫特

var window: UIWindow?
let viewController = ViewController();

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
    self.window!.backgroundColor = UIColor.redColor()
    self.window!.rootViewController = playerController
    self.window!.makeKeyAndVisible()

    return true
}

Answer 5

试试此代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
_window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

ViewController *controller = [[ViewController alloc]initWithNibName:@"View" bundle:nil];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:controller];
[self.window setRootViewController:nav];
[self.window makeKeyAndVisible];
return YES;
}

Answer 6

您需要设置： -

在AppDelegate.m文件中：null

_applicationDidFinishLaunchingWithOptions_

如何设置rootViewController？

6 个答案: