如何使 UIScrollview 一次只显示一个子视图

Question

我遵循了一个教程：https://www.youtube.com/watch?v=1_daE3IL_1s，它教你如何在 swift 3 中制作一个类似快速聊天的菜单，每次滑动时都会在屏幕上放置一个新的子视图，但它是唯一的，你需要再次滑动以获取下一个视图。本教程是在 swift 2 中制作的，但是当我更新到 swift 3 时，滚动视图现在就像正常滚动视图一样流畅地滚动。有没有办法解决这个问题？

主视图控制器代码：

class ViewController: UIViewController {

    @IBOutlet weak var scrollView: UIScrollView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let V1: View1 = View1(nibName: "View1", bundle: nil)
        let V2: View2 = View2(nibName: "View2", bundle: nil)
        let V3: View3 = View3(nibName: "View3", bundle: nil)

        V1.didMove(toParentViewController: self)
        self.addChildViewController(V1)
        self.scrollView.addSubview(V1.view)

        V2.didMove(toParentViewController: self)
        self.addChildViewController(V2)
        self.scrollView.addSubview(V2.view)

        V3.didMove(toParentViewController: self)
        self.addChildViewController(V3)
        self.scrollView.addSubview(V3.view)

        var V2Frame: CGRect = V2.view.frame
        V2Frame.origin.x = self.view.frame.width
        V2.view.frame = V2Frame

        var V3Frame: CGRect = V3.view.frame
        V3Frame.origin.x = 2 * self.view.frame.width
        V3.view.frame = V3Frame

        self.scrollView.contentSize = CGSize(width: self.view.frame.width*3 , height: self.view.frame.size.height)
    }

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

}

Answer 1

启用分页：

override func viewDidLoad() {
    super.viewDidLoad()
    scrollView.isPagingEnabled = true
    // ...
}