swift - UIScrollView 即使只有一页也可以水平滚动

Question

我的 Xcode 项目中的 UIScrollView 有问题。我用它来显示几张图片，但即使它只有一页，它仍然会水平滚动。可能与 setupPhotosInScrollView() 或 scrollViewDidScroll 有关。我不知道如何解决这个问题。看起来没问题，但仍然出现此错误。请帮忙!

这是我的代码:

override func viewDidLoad() {
    super.viewDidLoad()

    // Ad Title
    eTitleLabel.text = "\(eObj[EVENTS_TITLE]!)"

    // Get photos
    let imageFile = eObj[EVENTS_IMAGE1] as? PFFile
    imageFile?.getDataInBackground(block: { (data, error) in
        if error == nil { if let imageData = data {
            self.photosArray.append(UIImage(data: imageData)!)
            self.setupPhotosInScrollView()
            print("PHOTO 1")
    }}})

    DispatchQueue.main.async {

        if self.eObj[EVENTS_IMAGE2] != nil {
            self.pageControl.numberOfPages = 2
            let imageFile = self.eObj[EVENTS_IMAGE2] as? PFFile
            imageFile?.getDataInBackground(block: { (data, error) in
                if error == nil { if let imageData = data {
                    self.photosArray.append(UIImage(data: imageData)!)
                    self.setupPhotosInScrollView()
                    print("PHOTO 2")
            }}})
        }
    // ------------------------------------------------
// MARK: - SETUP PHOTOS IN SCROLLVIEW
// ------------------------------------------------
@objc func setupPhotosInScrollView() {
    var X:CGFloat = 0
    let Y:CGFloat = 0
    let W:CGFloat = view.frame.size.width
    let H:CGFloat = view.frame.size.height
    let G:CGFloat = 0
    var counter = 0

    // Loop to create ImageViews
    for i in 0..<photosArray.count {
        counter = i

        // Create a ImageView
        let aImg = UIImageView(frame: CGRect(x: X, y: Y, width: W, height: H))
        aImg.tag = i
        aImg.contentMode = .scaleAspectFit
        aImg.image = photosArray[i]

        // Add ImageViews based on X
        X += W + G
        containerScrollView.addSubview(aImg)

    } // ./ FOR loop

    // Place Buttons into a ScrollView
    containerScrollView.contentSize = CGSize(width: W * CGFloat(counter+2), height: H)
}


// ------------------------------------------------
// MARK: - CHANGE PAGE CONTROL PAGES ON SCROLL
// ------------------------------------------------
func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let pageWidth = containerScrollView.frame.size.width
    let page = Int(floor((containerScrollView.contentOffset.x * 2 + pageWidth) / (pageWidth * 2)))
    pageControl.currentPage = page
}

Answer 1

替换

containerScrollView.contentSize = CGSize(width: W * CGFloat(counter+2), height: H)

与

containerScrollView.contentSize = CGSize(width: W * CGFloat(photosArray.count), height: H)

当您为 contentSize 设置的宽度不等于添加的照片数量时