Question

我试图搜索这个，但找不到任何完美的解决方案。我的应用程序有自定义动画视图和两个侧抽屉。我也有自定义navigationController，它有滑动顶部栏。从appDelegate我将第一个控制器设置为rootViewController，然后推送ViewController（即带有动画的mainViewController）。然后试图推动第二个控制器。从第二个控制器我可以到按钮Click上的第三个控制器或rootViewController。当我在使用popToViewController从secondController返回后尝试转到第二个viewController时，应用程序崩溃。

我在appdelegate将rootViewController设置为：

let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "LoadingDataView") as! LoadingDataView
self.navigationController = SDNavigationController(rootViewController: profileViewController);
self.navigationController.navigationBar.isHidden=true;
self.window!.rootViewController =  self.navigationController
self.window!.makeKeyAndVisible()

将ViewController（mainController）推送为：

if( app.navigationController.viewControllers.count < 2){
    let profileViewController=mainStoryboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
    app.navigationController?.pushViewController(profileViewController, animated: true);
}else{
    let profileViewController=mainStoryboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
    app.navigationController?.pushViewController(profileViewController, animated: false);
    let emptyView = UIViewController();
    app.navigationController?.pushViewController(emptyView, animated: false);
    app.navigationController.popViewController(animated: true);
}

然后将第二个viewController推送为：

let tutorialView=myStory.instantiateViewController(withIdentifier: "BookmarksDetails") as! BookmarksDetails;
self.navigationController!.pushViewController(tutorialView, animated: true);

从第二个viewController返回：

let testController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ViewController") as! ViewController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
testController.isOpenLeftDrawer = true
appDelegate.window?.rootViewController = testController
self.navigationController?.popToRootViewController(animated: true)

当我尝试从viewController（mainController）转到secondViewController时，

应用程序崩溃。

Answer 1

你为什么这样做 -

app.navigationController.popViewController(animated: true);

只需按这里即可使用pop ViewController代码。

popToViewController之后应用程序在pushViewController上崩溃

1 个答案: