ios - 如何在 Swift 的页面 View 中隐藏点的背景？

Question

我目前在删除背景(屏幕底部的栏)方面遇到问题，就像他们在这个 post 中遇到的问题一样

然而，发布的解决方案都是在 Objective-c 中。我试图将它翻译成 Swift，但没有成功。

我也试过把“UIPageControl.appearance()”改成cleancolor，还是不行。

有人可以提供一些提示吗？

谢谢!

我的代码在这里:

import UIKit

class TutorialViewController: UIViewController, UIPageViewControllerDataSource{

var pageViewController: UIPageViewController?
let contentImages = ["Tutorial1.png", "Tutorial2.png","Tutorial3.png"]


override func viewDidLoad() {
    super.viewDidLoad()
    createPageViewController()
    setupPageControl()

    // Do any additional setup after loading the view.
}

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

    //supporting functions
private func createPageViewController() {

    let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as! UIPageViewController
    pageController.dataSource = self

    if contentImages.count > 0 {
        let firstController = getItemController(0)!
        let startingViewControllers: NSArray = [firstController]
        pageController.setViewControllers(startingViewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
    }

    pageViewController = pageController
    addChildViewController(pageViewController!)
    self.view.addSubview(pageViewController!.view)
    pageViewController!.didMoveToParentViewController(self)
}

private func setupPageControl() {
    let appearance = UIPageControl.appearance()
    appearance.pageIndicatorTintColor = UIColor.grayColor()
    appearance.currentPageIndicatorTintColor = UIColor.whiteColor()
    appearance.backgroundColor = UIColor.clearColor()
}

// MARK: - UIPageViewControllerDataSource

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

    let itemController = viewController as! PageItemViewController

    if itemController.itemIndex > 0 {
        return getItemController(itemController.itemIndex-1)
    }

    return nil
}

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

    let itemController = viewController as! PageItemViewController

    if itemController.itemIndex+1 < contentImages.count {
        return getItemController(itemController.itemIndex+1)
    }

    return nil
}

private func getItemController(itemIndex: Int) -> PageItemViewController? {

    if itemIndex < contentImages.count {
        let pageItemController = self.storyboard!.instantiateViewControllerWithIdentifier("TutorialItemController")as! PageItemViewController
        pageItemController.itemIndex = itemIndex
        pageItemController.imageName = contentImages[itemIndex]
        return pageItemController
    }

    return nil
}

// MARK: - Page Indicator

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

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

override func prefersStatusBarHidden() -> Bool {

    return true;
}

}

Answer 1

尝试删除此方法

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

它对我来说很快就很好用