Ios UIPageViewController在UIPageViewControllerTransitionStyle.Scroll时忽略约束

我正在为我的烹饪博客开发一个应用程序，希望在苹果AppStore应用程序上实现一种外观和感觉。在我的仪表板ViewController:UIViewController类中，我添加了一个headerView:UIView和一个scrollView:UIScrollView。headerView由my HeaderPageViewController:UIPageViewController填充，如下所示。设置约束以实现滚动时的视差效果。

要获取视图中的某些内容，my HeaderPageViewController的视图将获取一个imageContentView:UIImageView，该视图在运行时使用当月食谱填充。当然，我向imageContentView添加了常规约束，因此它的大小与HeaderPageViewController.view相同

使用

HeaderPageViewController（transitionStyle:UIPageViewControllerTransitionStyle.PageCurl，navigationOrientation:UIPageViewControllerNavigationOrientation.Horizontal，options:nil）初始化HeaderPageViewController时

一切正常。imageContentView的约束将被应用，图像将随着其在headerView中的ViewController而增长和收缩。而当我使用

HeaderPageViewController（transitionStyle:UIPageViewControllerTransitionStyle.Scroll，navigationOrientation:UIPageViewControllerNavigationOrientation.horizone，options:nil）初始化HeaderPageViewController时，

图像内容视图不会随着headerpiew的大小而改变

在下图的左侧，您可以看到使用带有UIPageViewControllerTransitionStyle.PageCurl的初始化器的效果。滚动时，headerPageViewController的大小将更改。在右侧，您可以看到设置UIPageViewControllerTransitionStyle时的结果。在初始化器中滚动。我更改了HeaderPageViewController的BackgroundColor属性，因此您可以更好地看到效果

---

我想我可以把它归结为UIPageViewController的分页。显示分页时，黑色区域立即可见，如下图所示显示分页。当向上滚动包含分页的视图时，会使用我的约束进行缩放，但显然这与我应用约束的视图不同

这是DashboardViewController的重要部分，包括myUIPageViewControllerDataSource函数声明

class DashboardViewController: UIViewController, NSFetchedResultsControllerDelegate, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
    [...]

    func populateHeaderView() {
        let headerPageViewController:HeaderPageViewController = HeaderPageViewController(transitionStyle: UIPageViewControllerTransitionStyle.Scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.Horizontal, options: nil)
        //transitionStyle: UIPageViewControllerTransitionStyle.Scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.Horizontal, options: nil
        headerPageViewController.view.backgroundColor = UIColor.blackColor()
        headerPageViewController.dataSource = self
        headerPageViewController.delegate = self
        let currentViewController:[UIViewController] = [self.viewControllerAtIndex(0)!]
        headerPageViewController.setViewControllers(currentViewController, direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)

        self.addChildViewController(headerPageViewController)
        let headerPageView:UIView = headerPageViewController.view
        headerPageView.translatesAutoresizingMaskIntoConstraints = false
        headerPageView.contentMode = UIViewContentMode.ScaleAspectFill
        headerView.addSubview(headerPageView)
        headerPageViewController.didMoveToParentViewController(self)

        var headerPageViewContraints = [NSLayoutConstraint]()
        headerPageViewContraints.append(NSLayoutConstraint(item: headerPageView,
            attribute: NSLayoutAttribute.Top,
            relatedBy: NSLayoutRelation.Equal,
            toItem: headerView,
            attribute:NSLayoutAttribute.Top,
            multiplier: 1.0,
            constant: 0.0))
        headerPageViewContraints.append(NSLayoutConstraint(item: headerPageView,
            attribute: NSLayoutAttribute.Bottom,
            relatedBy: NSLayoutRelation.Equal,
            toItem: headerView,
            attribute:NSLayoutAttribute.Bottom,
            multiplier: 1.0,
            constant: 0.0))
        headerPageViewContraints.append(NSLayoutConstraint(item: headerPageView,
            attribute: NSLayoutAttribute.Leading,
            relatedBy: NSLayoutRelation.Equal,
            toItem: headerView,
            attribute:NSLayoutAttribute.Leading,
            multiplier: 1.0,
            constant: 0.0))
        headerPageViewContraints.append(NSLayoutConstraint(item: headerPageView,
            attribute: NSLayoutAttribute.Trailing,
            relatedBy: NSLayoutRelation.Equal,
            toItem: headerView,
            attribute:NSLayoutAttribute.Trailing,
            multiplier: 1.0,
            constant: 0.0))
        self.view.addConstraints(headerPageViewContraints)
    }

    // MARK: UIPageViewController DataSource

    func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
        if var index:UInt = (viewController as! HeaderPageViewController).index {
            if (index == 0) {
                return nil
            }
            index--

            return self.viewControllerAtIndex(index)
        }
        return nil
    }

        func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
        if var index:UInt = (viewController as! HeaderPageViewController).index {
            index++
            if (Int(index) == headerRecipes.count) {
                return nil
            }
            return self.viewControllerAtIndex(index)
        }
        return nil
    }

    /*
    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
        return headerRecipes.count
    }

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

    // MARK: UIPageViewController Helper

    func getReasonableRecipesForHeaderPageViewController() {
        if(headerRecipes.count == 0) {
            headerRecipes = fetchedResultsController.fetchedObjects as! [Posts]
            if (headerRecipes.count > 3) {
                headerRecipes = Array(headerRecipes[0..<3])
            }
        }
    }

    func viewControllerAtIndex(index:UInt) -> UIViewController? {
        if (headerRecipes.count == 0 || Int(index) >= headerRecipes.count) {
            return nil
        }

        let headerPageViewController:HeaderPageViewController = HeaderPageViewController()
        let recipe:Posts = headerRecipes[Int(index)] as Posts
        headerPageViewController.manageImageContentView(UIImageView(image: UIImage(data:recipe.featured_image!)))
        headerPageViewController.index = index
        return headerPageViewController
    }
}

---

如果有人提示我必须应用约束的视图或我犯了愚蠢错误的地方，请告诉我。

我的一位朋友提到了，它假设UINavigationController中的UIPageViewController不会更新底部布局的自动布局约束。听起来很可能，这个bug也会影响我的布局，即使它在

UIPageViewControllerTransitionStyle.PageCurl

上运行良好。这个bug现在在Apple中报告。我的一个朋友提到了，它假设UINavigationController中的UIPageViewController不会更新底部布局的自动布局约束。听起来有可能，这个bug也会影响我的布局，即使它在

UIPageViewControllerTransitionStyle.PageCurl中运行良好。这个bug现在在Apple中报告。
import Foundation
import UIKit
class HeaderPageViewController: UIPageViewController {
    var imageView:UIImageView = UIImageView()
    var index:UInt?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func manageImageContentView(imageContentView:UIImageView) {
        imageView = imageContentView
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.contentMode = UIViewContentMode.ScaleAspectFill
        imageView.clipsToBounds = true

        self.view.addSubview(imageView)

        var headerViewContraints = [NSLayoutConstraint]()
        headerViewContraints.append(NSLayoutConstraint(item: imageView,
            attribute: NSLayoutAttribute.Top,
            relatedBy: NSLayoutRelation.Equal,
            toItem: self.topLayoutGuide,
            attribute:NSLayoutAttribute.Bottom,
            multiplier: 1.0,
            constant: 0.0))
        headerViewContraints.append(NSLayoutConstraint(item: imageView,
            attribute: NSLayoutAttribute.Bottom,
            relatedBy: NSLayoutRelation.Equal,
            toItem: self.view,
            attribute:NSLayoutAttribute.Bottom,
            multiplier: 1.0,
            constant: 0.0))
        headerViewContraints.append(NSLayoutConstraint(item: imageView,
            attribute: NSLayoutAttribute.Leading,
            relatedBy: NSLayoutRelation.Equal,
            toItem: self.view,
            attribute:NSLayoutAttribute.Leading,
            multiplier: 1.0,
            constant: 0.0))
        headerViewContraints.append(NSLayoutConstraint(item: imageView,
            attribute: NSLayoutAttribute.Trailing,
            relatedBy: NSLayoutRelation.Equal,
            toItem: self.view,
            attribute:NSLayoutAttribute.Trailing,
            multiplier: 1.0,
            constant: 0.0))
        self.view.addConstraints(headerViewContraints)
    }

    override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {

    }
}