1

我正在尝试为文档创建详细视图。详细视图的顶部是一个 90 像素高的卡片式布局，下面是在两个控制器之间切换的视图分页器：InfoViewController（显示一些元信息）和 DocumentViewController（显示 pdf）。

我在一个带有两个 UIView 的 xib 文件中布置了顶级控制器 (DetailViewController)：viewForCard 和 viewForPager。但是，InfoViewController 和 DocumentViewController 中定义的 outlet 在调用 viewDidLoad 方法时尚未初始化。有人知道为什么吗？

DetailViewController 中的主要代码（容器视图 viewForCard 和 viewForPager 的约束已在 xib 文件中设置：

@IBOutlet weak var viewForCard: UIView!
@IBOutlet weak var viewForPager: UIView!

var pageViewController:UIPageViewController = UIPageViewController()
var infoVC:InfoViewController = InfoViewController()
var documentVC:DocumentViewController = DocumentViewController()

override func viewDidLoad() {
    super.viewDidLoad()

    pageViewController.delegate = self
    pageViewController.dataSource = self
    addChildViewController(pageViewController)
    pageViewController.setViewControllers([infoVC], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
    initLayout()
}

func initLayout(){
    var cardView:UIView = Card(document: document).contentView
    cardView.setTranslatesAutoresizingMaskIntoConstraints(false)

    var pagerView = pageViewController.view
    pagerView.setTranslatesAutoresizingMaskIntoConstraints(false)

    viewForCard.addSubview(cardView)
    viewForPager.addSubview(pagerView)

    let bindings = ["card": cardView, "pager": pagerView]
    viewForCard.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-0.0-[card]-0.0-|", options: nil, metrics: nil, views: bindings))
    viewForCard.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-0.0-[card]-0.0-|", options: nil, metrics: nil, views: bindings))

    viewForPager.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-0.0-[pager]-0.0-|", options: nil, metrics: nil, views: bindings))
    viewForPager.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-0.0-[pager]-0.0-|", options: nil, metrics: nil, views: bindings))
}

func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController?{
    if viewController == documentVC{
        return infoVC
    }else{
        return nil
    }
}

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController?{
    if viewController == infoVC{
        return documentVC
    }else{
        return nil
    }
}
4

3 回答 3

1

你应该改变：

var infoVC:InfoViewController = InfoViewController()
var documentVC:DocumentViewController = DocumentViewController()

至：

var infoVC:InfoViewController = InfoViewController(nibName: "InfoViewController", bundle: nil)
var documentVC:DocumentViewController = DocumentViewController(nibName: "DocumentViewController", bundle: nil)
于 2015-10-26T04:06:59.820 回答
0

显然，视图控制器是用 nibname nil 初始化的，这就是未设置插座的原因。

于 2015-05-04T11:05:57.413 回答
0

在斯威夫特 5

像这样初始化 viewController。

let firstVC:FirstVC = storyboard?.instantiateViewController(withIdentifier: "FirstVC") as! FirstVC

pageController.setViewControllers([firstVC], direction: .forward, animated: true, completion: nil)
于 2019-12-17T10:45:44.833 回答