如何在UISplitViewController中分配MasterViewController子菜單的代理

我有一個DetailViewController，它是在應用程序啓動開始時尚未推送的子菜單的代理。在這裏，我想知道哪裏是將委託屬性分配給ViewController的最佳位置。如何在UISplitViewController中分配MasterViewController子菜單的代理

這是我所做的AppDelegates.swift

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

     dataController = DataController() 

     let splitViewController = self.window!.rootViewController as! UISplitViewController 
     splitViewController.delegate = self 

     let detailNavigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController 
     detailNavigationController.topViewController!.navigationItem.leftBarButtonItem = splitViewController.displayModeButtonItem() 
     let mainVC = detailNavigationController.topViewController as! MainViewController 
     mainVC.dataController = dataController 

     let masterNavigationController = splitViewController.viewControllers[0] as! UINavigationController 
     let mainMenuVC = masterNavigationController.topViewController as! MainMenuViewController 
     mainMenuVC.dataController = dataController 

     self.storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()) 
     let nationsMenuVC = storyboard.instantiateViewControllerWithIdentifier("NationsMenuViewController") as! NationsMenuViewController 
     nationsMenuVC.delegate = mainVC 

     return true 
    }

和子菜單（NationsMenuVC）具有這樣的：

protocol NationsMenuViewControllerDelegate: class { 
    func nationSelected(nation: City?) 
} 

class NationsMenuViewController: UITableViewController { 

    var nations:[City] = [] 
    var moc: NSManagedObjectContext! 
    weak var delegate: NationsMenuViewControllerDelegate? 

    override func viewDidLoad() { 
. 
. 
. 

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 
    let selectedCity = self.nations[indexPath.row] 
    self.delegate?.nationSelected(selectedCity) 
    print("clicked at \(selectedCity.name)") 
} 

}

而且我也實現我的詳細視圖 - 控制委託協議（MainVC ），但功能沒有觸發。我想知道是否因爲委託屬性在應用啓動時被分配爲弱，並且因爲它還沒有從主菜單中進行任何引用（因爲用戶還沒有實際在主視圖控制器級別單擊它），委託鏈接可能已經被解除了記憶？

在這種情況下，哪裏可以宣佈尚未加載的viewcontroller委託的最佳位置？

extension MainViewController: NationsMenuViewControllerDelegate { 
    func nationSelected(nation: City?) { 
     if let selectedCity = nation { 
      let coor:CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: selectedCity.latitude!.doubleValue, longitude: selectedCity.longitude!.doubleValue) 
      let span:MKCoordinateSpan = MKCoordinateSpan(latitudeDelta: 8.0, longitudeDelta: 8.0) 
      let region:MKCoordinateRegion = MKCoordinateRegion(center: coor, span: span) 
      self.mapView.setRegion(region, animated: true) 
      print("selected \(selectedCity.name)") 
     } 

    } 
}

來源

2016-02-05 Kann

，您在應用程序創建的nationsMenuVC很明顯：從未使用過，因此被立即去分配中：didFinishLaunchingWithOptions。您可以在NationsMenuViewController的viewDidLoad中設置委託。您可能想知道如何訪問NationsMenuViewController的viewDidLoad中的mainVC。您可以創建在AppDelegate中的功能鬻這一點

func mainVC() -> MainViewController{ 

    let splitViewController = self.window!.rootViewController as! UISplitViewController 


      let detailNavigationController = splitViewController.viewControllers[splitViewController.viewControllers.count-1] as! UINavigationController 

     let mainVC = detailNavigationController.topViewController as! MainViewController 
     return mainVC 

    }

現在你可以調用這個NationsMenuViewController的viewDidLoad中內並設置委託：

self.delegate = UIApplication.sharedApplication().delegate. mainVC()

HTH

來源

2016-02-05 05:29:56 Shripada

感謝Shripada，但可你只需調用self.window！出於藍色得到像這樣的UISplitViewController？讓splitViewController = self.window！.rootViewController as！ UISplitViewController – Kann

沒關係，我只是這樣做了： self.window = UIApplication.sharedApplication（）。keyWindow – Kann

如何在UISplitViewController中分配MasterViewController子菜單的代理

回答

相關問題