Ios 使用“我的视图控制器swift 4”中的按钮使用UIPageViewController更改页面

我有一个UIPageViewController，让我在多个视图控制器之间导航。 我的应用程序可以滑动我的屏幕，但我想删除滑动手势，以便在页面之间导航视图中的不同按钮 这是我在页面视图CxController上使用的代码

class RootPageViewController: UIPageViewController,UIPageViewControllerDataSource {

lazy var viewControllerList: [UIViewController] = {
    let storyBoard = UIStoryboard(name: "Main", bundle: nil)

    let VC1 = storyBoard.instantiateViewController(withIdentifier: "orangeVC")
    let VC2 = storyBoard.instantiateViewController(withIdentifier: "blueVC")
    let VC3 = storyBoard.instantiateViewController(withIdentifier: "purpleVC")

    return [VC1, VC2, VC3]
}()

override func viewDidLoad() {
    super.viewDidLoad()

    self.dataSource = self

    if let firstViewController = viewControllerList.first {
        self.setViewControllers([firstViewController], direction: .forward, animated: true, completion: nil)            
    }
}

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

func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
    guard let vcIndex = viewControllerList.index(of: viewController) else {return nil}
    let previousIndex = vcIndex-1
    guard previousIndex >= 0 else {return nil}
    guard viewControllerList.count > previousIndex else {return nil}

    return viewControllerList[previousIndex]
}

func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    guard let vcIndex = viewControllerList.index(of: viewController) else {return nil}
    let nextIndex = vcIndex+1
    guard viewControllerList.count != nextIndex else {return nil}
    guard viewControllerList.count > nextIndex else {return nil}

    return viewControllerList[nextIndex]
}

---

}

您只需要在按钮操作中使用这一行

self.setViewControllers([viewControllerList[indexHere]], direction: .forward, animated:false, completion: nil)            

---

我怎样才能得到当前的视图索引呢？正如这里的

guard let vcIndex=viewControllerList.index（of:self.viewControllers.first！）或者{return nil}

你也可以保留一个计数器varJust，这里我有个问题，我不得不在我的页面视图控制器上按下一个按钮，所以我试着在我的另一个视图控制器上按下一个按钮。如何在另一个视图控制器上使用它，或者如何在同一页面视图控制器代码的不同视图上添加按钮的操作？