Xcode 7更新後類型UIViewController的值沒有成員topViewController

更新到Xcode 7後，出現此錯誤「類型爲UIViewController的值沒有成員topViewController。其他人遇到這個？ topViewController不再是UIViewController的一部分嗎？Xcode 7更新後類型UIViewController的值沒有成員topViewController

override func viewDidLoad() { 
    super.viewDidLoad() 
    self.navigationItem.leftBarButtonItem = self.editButtonItem() 
    let addButton = UIBarButtonItem(barButtonSystemItem: .Search, 
     target: self, action: "addButtonPressed:") 
    self.navigationItem.rightBarButtonItem = addButton 

    if let split = self.splitViewController { 
     let controllers = split.viewControllers 
     self.detailViewController = 
      controllers[controllers.count-1].topViewController as? ### Error heres 
     DetailViewController 
    } 

    model = Model(delegate: self) // create the Model 
    model.synchronize() // tell model to sync its data 
    self.navigationController?.toolbarHidden = false; 
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"Home", style:.Plain, target:nil, action:nil) 
}

來源

2015-09-28 Michael Sebastian

你必須讓它明確，以便它知道你正試圖從UINavigationController得到topViewController斯威夫特2：

self.detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController

來源

2015-09-28 05:38:49 Unheilig

燁，我最終計算出來。我把這個：如果讓split = self.splitViewController讓controllers = split.viewControllers self.detailViewController = （controllers [controllers.count-1] as！UINavigationController）.topViewController as？ DetailViewController } –

'as？ DetailViewController'的鑄造非常重要。謝謝。 – tymac

感謝tymac指出這一點;） – Marin

Xcode 7更新後類型UIViewController的值沒有成員topViewController

回答

相關問題