popToViewController 后 pushViewController 上的应用程序崩溃

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，两侧 drawers.I 也有自定义导航控制器，它有滑动顶部 bar.From appDelegate 我将第一个控制器设置为 rootViewController 然后推送 ViewController(即 mainViewController 和动画）。然后试图推动第二个控制器。我可以从第二个控制器转到第三个控制器或单击按钮时的 rootViewController。当我使用 popToViewController.

从 secondController 返回后尝试转到第二个 viewController 时，应用程序崩溃了

我在 appdelegate 中将 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 推为：

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

从第二个 viewController 回来：

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) 转到第二个 ViewController 时，应用程序崩溃了。

Answer 1

你为什么要这样做 -

app.navigationController.popViewController(animated: true);

这里只push，不使用popViewController代码

popToViewController 后 pushViewController 上的应用程序崩溃

App crash on pushViewController after popToViewController

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