ios - 如何将 UIScrollView 移动一帧的宽度？ (Xcode， swift )

Question

我正在尝试制作一个使用类似于 Snapchat 功能的应用程序，在该应用程序中，用户可以在水平相邻的 3 个框架之间滑动。一切似乎都正常，但默认情况下，scrollView 会在最左侧显示 View ，并允许用户向右滑动两次以到达最右侧的 View 。我希望 ScrollView 首先显示中间 View ，允许用户向左或向右滑动，但似乎无法做到这一点。提前致谢。

class ViewController: UIViewController {

@IBOutlet weak var scrollView: UIScrollView!

override func viewDidLoad() {
    super.viewDidLoad()

    scrollView.frame = self.view.bounds

    let ViewOne = HomeViewController(nibName: "HomeViewController", bundle: nil)
    ViewOne.view.frame = self.view.bounds

    let ViewTwo = ExploreViewController(nibName: "ExploreViewController", bundle: nil)
    ViewTwo.view.frame = self.view.bounds

    let ViewThree = ProfileViewController(nibName: "ProfileViewController", bundle: nil)
    ViewThree.view.frame = self.view.bounds

    self.addChildViewController(ViewOne)
    self.scrollView.addSubview(ViewOne.view)
    ViewOne.didMove(toParentViewController: self)

    self.addChildViewController(ViewTwo)
    self.scrollView.addSubview(ViewTwo.view)
    ViewTwo.didMove(toParentViewController: self)

    self.addChildViewController(ViewThree)
    self.scrollView.addSubview(ViewThree.view)
    ViewThree.didMove(toParentViewController: self)

    ViewTwo.view.center = CGPoint(x: ViewOne.view.center.x + self.view.frame.width, y: self.view.center.y)
    ViewThree.view.center = CGPoint(x: ViewOne.view.center.x - self.view.frame.width, y: self.view.center.y)

    scrollView.contentSize = CGSize(width: self.view.frame.width * 3, height: self.view.frame.height)
    print(self.view.center.x)

}

Answer 1

scrollView.contentOffset = CGPoint(x: self.view.bounds.width, y: 0)

这会将 ScrollView 偏移一个等于 View 宽度的量