從AppDelegate傳遞數據到TableViewController沒有NavigationBar

Question

我正在測試一個由蘋果公司的Swift示例項目，它叫做Table Search with UISearchController。我試過了。它運行。所以我在Swift 3中從頭開始做一個例子。無論如何，下面是我的。

class AppDelegate: UIResponder, UIApplicationDelegate { 
    var window: UIWindow? 

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
     // Product is a data model class. 
     let products = [ 
      Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPhone.rawValue, yearIntroduced: 2007, introPrice: 599.00), 
      Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPod.rawValue, yearIntroduced: 2001, introPrice: 399.00), ... 
     ] 

     let navController = window!.rootViewController as! UINavigationController 
     let tableViewController = navController.viewControllers.first as! MainTableViewController 
     tableViewController.products = products 
     return true 
    } 
} 

// MainTableViewController, BaseTableViewController are subclasses of UITableViewController 
class MainTableViewController: BaseTableViewController { 
    var products = [Product]() 

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return products.count 
    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier(BaseTableViewController.tableViewCellIdentifier, forIndexPath: indexPath) 
     let product = products[indexPath.row] 
     configureCell(cell, forProduct: product) 
     return cell 
    } 
} 

由於AppDelegate意味着，這個表視圖控制器有一個導航欄。 AppDelegate將成功地將數據傳遞給表視圖控制器。如果沒有？所以我有以下幾點。

class AppDelegate: UIResponder, UIApplicationDelegate { 

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

     let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
     let tableViewController = storyboard.instantiateViewController(withIdentifier: "tableController") as! MainTableViewController 
     tableViewController.data = dataSet 
     return true 
    } 
} 

而且tableViewController從不AppDelegate及時獲取數據。我知道如何改變它，以便表視圖控制器本身將從AppDelegate獲取數據。但是我怎樣才能使AppDelegate將數據推送到表視圖控制器？我必須使用該過程的協議嗎？

謝謝。

Answer 1

如果您的rootViewController是MainTableViewController而不是UINavigationController，則將其轉換爲該特定的ViewController並將其傳遞給它。

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
    // Product is a data model class. 
    let products = [ 
     Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPhone.rawValue, yearIntroduced: 2007, introPrice: 599.00), 
     Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPod.rawValue, yearIntroduced: 2001, introPrice: 399.00), ... 
    ] 

    if let tableViewController = window!.rootViewController as? MainTableViewController { 
     tableViewController.products = products 
    } 
    return true 
} 

如果MainTableViewController不是rootViewController那麼您可以在MainTableViewController中使用其共享的實例，但對於您需要創建實例屬性中AppDelegate與你在你的情況下，希望它是[Product]類型。

的AppDelegate

變種產品=產品

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
// Product is a data model class. 
    self.products = [ 
     Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPhone.rawValue, yearIntroduced: 2007, introPrice: 599.00), 
     Product(hardwareType: Product.deviceTypeTitle, title: Product.Hardware.iPod.rawValue, yearIntroduced: 2001, introPrice: 399.00), ... 
    ] 

現在MainTableViewController訪問該數組像這樣。

if let delegate = UIApplication.sharedApplication().delegate as? AppDelegate { 
    self.data = delegate.products 
}