ios - 如何使 UIScrollview 一次只显示一个 subview

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 中制作类似菜单的 snap-chat，每次你滑动时都会在屏幕上放置一个新的 subview ，但它是唯一的，你需要再滑动一次才能获得下一个 View 。本教程是在 swift 2 中制作的，但是当我更新到 swift 3 时， ScrollView 现在像普通 ScrollView 一样流畅地滚动。有什么办法可以解决这个问题吗？

主视图 Controller 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
    // ...
}