Question

谁可以帮助缩放scrollview。使用“解析”获取图片，但无法进行缩放。通过所有可能的功能不起作用-这是（UIImage）到setupPhotosInScrollView函数，任何人都可以帮忙吗？尝试过框架，但无济于事

代码

class AdPhotos: UIViewController, UIScrollViewDelegate {

    /*--- VIEWS ---*/
    @IBOutlet weak var containerScrollView: UIScrollView!


    /*--- VARIABLES ---*/
    var adObj = PFObject(className: ADS_CLASS_NAME)
    var photosArray = [UIImage]()



    // ------------------------------------------------
    // MARK: - VIEW DID LOAD
    // ------------------------------------------------
    override func viewDidLoad() {
        super.viewDidLoad()

        // Ad Title
        adTitleLabel.text = "\(adObj[ADS_TITLE]!)"

        // Get photos
        let imageFile = adObj[ADS_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.adObj[ADS_IMAGE2] != nil {
                self.pageControl.numberOfPages = 2
                let imageFile = self.adObj[ADS_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")
                        }}})
            }
            if self.adObj[ADS_IMAGE3] != nil {
                self.pageControl.numberOfPages = 3
                let imageFile = self.adObj[ADS_IMAGE3] 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 3")
                        }}})
            }
            if self.adObj[ADS_IMAGE4] != nil {
                self.pageControl.numberOfPages = 4
                let imageFile = self.adObj[ADS_IMAGE4] 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 4")
                        }}})
            }
            if self.adObj[ADS_IMAGE5] != nil {
                self.pageControl.numberOfPages = 5
                let imageFile = self.adObj[ADS_IMAGE5] 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 5")
                        }}})
            }

        }
    }
    // ------------------------------------------------
    // 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

我认为您不需要ScrollView和管理Pagingnation。您需要仅启用分页乏味的分页选项的CollectionView。

在ViewController中拖动集合视图。启用分页选项从属性选择器。
将CollectionView（leading，trailing，top，bottom）分配给View（leading，trailing，{{ 1}}，top）
将CollectionView单元拖到CollectionView中。调整单元格的大小以填充整个CollectionView
将Scrollview添加到CollectionView单元格并添加ScrollView（bottom， leading，trailing，top）== CollectionView单元格（bottom， leading，trailing，top）
在Scrollview中添加imageView并添加imageView（bottom， leading，trailing，top）==滚动视图（bottom， leading，trailing，top）并与CollectionView单元格的宽度和高度相等。
为CollectionView实现bottom和DataSource方法。

并进行缩放，将以下代码添加到您的CollectionView单元格中

Delegate

无法使用解析在滚动视图中缩放UIImage

1 个答案: