根据PageviewController调整containerView的高度

Question

我有点难以根据pageViewController的高度调整ContainerView的高度。

因此在此示例中，我有两个页面：“ 黄页”，“ 紫色页”

黄页 = 120px高度

紫色页面 = 250px高度

我要做的就是在滚动到containerView上嵌入的pageViewController时自动调整高度。

希望您能提供帮助，谢谢！

这是图片。 Storyboard Image

这是我的PageViewController代码。

import UIKit    

class PageViewController: UIPageViewController,UIPageViewControllerDataSource, UIPageViewControllerDelegate {


    func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.index(of: viewController)!
        let previousIndex = abs((currentIndex - 1) % pages.count)
        return pages[previousIndex]



    }

    func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
        let currentIndex = pages.index(of: viewController)!
        let nextIndex = abs((currentIndex + 1) % pages.count)
        return pages[nextIndex]
    }

    var pages = [UIViewController]()
    override func viewDidLoad() {
        super.viewDidLoad()    

        self.delegate = self
        self.dataSource = self

        let page1: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "page1");
        let page2: UIViewController! = storyboard?.instantiateViewController(withIdentifier: "page2");
        pages.append(page1)
        pages.append(page2)
        setViewControllers([page1], direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)


    }

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

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

    override func viewDidLayoutSubviews() {


    }    



}

Answer 1

您可以钩住容器的高度并像这样从寻呼机控制它

@IBOutlet weak var conH: NSLayoutConstraint!  

//

func callMe(value:CGFloat) {

    conH.constant = value

    self.view.layoutIfNeeded()
}

//

func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {

    let vc = UIApplication.shared.keyWindow?.rootViewController as! ViewController

    let currentIndex = pages.index(of: previousViewControllers.first!)!

    let nextIndex = abs((currentIndex + 1) % pages.count)

    vc.callMe(value:nextIndex == 0 ? 100 : 200)

}

//