所有IBOutlets是零

Question

餵我的viewController初始化使用此代碼：

var aboutUsViewController = self.storyboard?.instantiateViewControllerWithIdentifier("AboutUsViewController") as AboutUsViewController 

這個我搬到aboutViewController後。然而，我所有aboutViewController上的IBOutlets都是nil！爲什麼？ 我正在使用MMDrawer庫以獲得側欄菜單。

var aboutUsViewController = self.storyboard?.instantiateViewControllerWithIdentifier("AboutUsViewController") as AboutUsViewController 


     var aboutUsNavController = UINavigationController(rootViewController: aboutUsViewController) 

     var appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate 

     appDelegate.centerContainer!.centerViewController = aboutUsNavController 
     appDelegate.centerContainer!.toggleDrawerSide(MMDrawerSide.Left, animated: true, completion: nil) 

在側欄我選擇關於我們的菜單項和我創造AboutViewController並將其移動到左側後...問題是，當我初始化我的控制器，出口是零

我使用pageViewController時也有這樣的問題：

class ViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate { 


let pageTitles = ["Title 1", "Title 2", "Title 3", "Title 4"] 
var images = ["long3","long4","long1","long2"] 
var count = 0 


var pageViewController : UIPageViewController! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    reset() 
    // Do any additional setup after loading the view, typically from a nib. 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 

func reset() { 
    /* Getting the page View controller */ 
    pageViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageViewController") as UIPageViewController 
    self.pageViewController.dataSource = self 

    let pageContentViewController = self.viewControllerAtIndex(0) 
    self.pageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil) 

    /* We are substracting 30 because we have a start again button whose height is 30*/ 
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height - 30) 
    self.addChildViewController(pageViewController) 
    self.view.addSubview(pageViewController.view) 
    self.pageViewController.didMoveToParentViewController(self) 
} 



func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? { 

    var index = (viewController as PageContentViewController).pageIndex! 
    index++ 
    if (index >= self.images.count){ 
     return nil 
    } 

    return self.viewControllerAtIndex(index) 
} 


func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? { 
    var index = (viewController as PageContentViewController).pageIndex! 

    if index<=0 { 
     return nil 
    } 
    index-- 
    return self.viewControllerAtIndex(index) 
} 

func viewControllerAtIndex(index : Int) -> UIViewController? { 
    if((self.pageTitles.count == 0) || (index >= self.pageTitles.count)) { 
     return nil 
    } 
    let pageContentViewController = self.storyboard?.instantiateViewControllerWithIdentifier("PageContentViewController") as PageContentViewController 

    pageContentViewController.imageName = self.images[index] 
    pageContentViewController.titleText = self.pageTitles[index] 
    pageContentViewController.pageIndex = index 
    return pageContentViewController 
} 

func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int { 
    return pageTitles.count 
} 

func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int { 
    return 0 
    } 

} 



class PageContentViewController: UIPageViewController { 


@IBOutlet var imageViewMain: UIImageView! 

@IBOutlet var labelMain: UILabel! 

var pageIndex: Int! 
var titleText: String! 
var imageName: String! 


override func viewDidLoad() { 
    super.viewDidLoad() 

    self.imageViewMain.image = UIImage(named:imageName) 
    self.labelMain.text = self.titleText 
    self.labelMain.alpha = 0.1 
    UIView.animateWithDuration(1.0, animations:{()-> Void in 
     self.labelMain.alpha = 1.0 
    }) 
    // Do any additional setup after loading the view. 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 


/* 
// MARK: - Navigation 



    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 

} 

我有問題，標籤和圖像出口零！我使用MMDrawer庫的問題也一樣。同樣的情況。我不使用segues！我認爲，因爲該網點是零

Answer 1

我假設你在實例化場景後立即查看網點（如果使用網格並嘗試使用prepareForSegue中的網點，也會看到此行爲）。但是直到演示/推送到該場景之後，插口才被連接，視圖被加載，並調用viewDidLoad。

底線，不要試圖在調用viewDidLoad之前使用插座（即在實例化場景後不要立即使用插座）。相反，將所需數據傳遞到目標場景（例如String屬性），然後目的地的viewDidLoad應填充出口。

例如，你可能有一個屬性AboutUsViewController：

var message: String! 

當你實例AboutUsViewController，你會設置該屬性：

let aboutUsViewController = self.storyboard?.instantiateViewControllerWithIdentifier("AboutUsViewController") as AboutUsViewController // use `as!` in Swift 1.2 

aboutUsViewController.message = "some message" 

presentViewController(aboutUsViewController, animated: true, completion: nil) 

然後的AboutUsViewController的viewDidLoad將使用物業相應地填充出口：

override func viewDidLoad() { 
    super.viewDidLoad() 

    label1.text = message 
} 

但是，您絕不會讓原始視圖控制器嘗試設置/調整目標場景的出口。這是AboutUsViewController的責任。

---

只是爲了確認，您的店鋪是否正確連接？下面顯示了兩種確認他們正確連接的方法。

當您在界面生成器中選擇視圖控制器，然後查看連接檢查器時，您是否看到您的插座連接在那裏？在下面的快照，label1掛起來，但label2是不是：

或者，當你在你的代碼，並期待在商店，你看到在左邊距實點（指出口被連接起來）還是空的點（意思是出口沒有連接起來）？

Answer 2

我找到了答案。而不是創建UIViewController，我創建了UIPageViewController！