Swift – 从appDelegate的pushViewController，rootViewController.navigationController是零

遇到一些问题，特别是http://blog.originate.com/blog/2014/04/22/deeplinking-in-ios/

我正在设置urlscheme，它运行良好，从另一个应用程序启动应用程序，但通过主机或url不工作，因为它似乎应该。 我使用所有视图布局的故事板和界面生成器。

该指南在appDelegate中显示了这个openURL：

-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{ if([[url host] isEqualToString:@"page"]){ if([[url path] isEqualToString:@"/page1"]){ [self.mainController pushViewController:[[Page1ViewController alloc] init] animated:YES]; } return YES; } } 

这里是我的版本简化，并迅速从其他几个来源，即获取实例的ViewController从AppDelegate在Swift中我跳过的条件为目前的URL主机，以消除潜在的其他variables的问题。

 func application(application: UIApplication, openURL url: NSURL, sourceApplication: String, annotation: AnyObject?) -> Bool { var rootViewController = self.window!.rootViewController let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) var profileViewController = mainStoryboard.instantiateViewControllerWithIdentifier("profile") as ProfileViewController rootViewController.navigationController.popToViewController(profileViewController, animated: true) return true } 

迅速版本导致崩溃： fatal error: unexpectedly found nil while unwrapping an Optional value

似乎rootViewController没有导航控制器呢？

Answer 1

在一行代码中：

Swift 3：

 self.navigationController!.pushViewController(self.storyboar‌​d!.instantiateViewCo‌​ntroller(withIdentif‌​ier: "view2") as UIViewController, animated: true) 

---

 self.navigationController!.pushViewController(self.storyboard!.instantiateViewControllerWithIdentifier("view2") as UIViewController, animated: true) 

Answer 2

似乎在我的情况下，rootViewController实际上是UINavigationControllertypes，所以在声明上强制转换允许我直接调用pushToViewController。

 func application(application: UIApplication, openURL url: NSURL, sourceApplication: String, annotation: AnyObject?) -> Bool { var rootViewController = self.window!.rootViewController as UINavigationController let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) var profileViewController = mainStoryboard.instantiateViewControllerWithIdentifier("profile") as ProfileViewController rootViewController.pushToViewController(profileViewController, animated: true) return true } 

Answer 3

APPDELEGATE TO PAGE：

  let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let loginPageView = mainStoryboard.instantiateViewControllerWithIdentifier("leadBidderPagerID") as! LeadBidderPage var rootViewController = self.window!.rootViewController as! UINavigationController rootViewController.pushViewController(loginPageView, animated: true) 

页面到页面：

  let loginPageView = self.storyboard?.instantiateViewControllerWithIdentifier("scoutPageID") as! ScoutPage self.navigationController?.pushViewController(loginPageView, animated: true) 

Answer 4

更新为3/4。 由于在“自我”中没有导航控制器，所以投票最多的“一行代码”不起作用，

 let rootViewController = self.window!.rootViewController as! UINavigationController let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "ProfileViewController") as! ProfileViewController rootViewController.pushViewController(profileViewController, animated: true) 

Answer 5

 func pushNewView() { if let wind = UIApplication.sharedApplication().delegate?.window { if let rootViewController = wind?.rootViewController { let viewToPush = YourViewController() let nav1 = UINavigationController(rootViewController: viewToPush) if let alreadySomeOneThere = rootViewController.presentedViewController { alreadySomeOneThere.presentViewController(nav1, animated: true, completion: nil) }else { rootViewController.presentViewController(nav1, animated: true, completion: nil) } } } }