下载图像用作贴纸包的贴纸

Question

我正在尝试制作一个贴纸包，该贴纸包在设备上本地没有贴纸图像，但可以从网站上获取它们。

我已经在iMessage应用程序中尝试过此操作，但是UI中没有任何显示。要进一步扩展我想做的事情：我希望项目中没有图像，但希望能够从网站上下载图像以使用标签。这是我的代码：

import Foundation
import Messages

class CustomStickers : MSStickerBrowserViewController {

    var Stickers : [MSSticker]!

    var stickerNames = ["image8-2"]

    override func viewDidLoad() {
        super.viewDidLoad()

        self.Stickers = [MSSticker]()
        self.Stickers = loadStickers()

        let urlDownload = URL(string: "https://blog.hubspot.com/hubfs/image8-2.jpg")!
        downloadImage(from: urlDownload)
    }

    func getData(from url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
        URLSession.shared.dataTask(with: url, completionHandler: completion).resume()
    }

    func downloadImage(from url: URL) {
        print("Download Started")
        getData(from: url) { data, response, error in
            guard let data = data, error == nil else { return }
            print(response?.suggestedFilename ?? url.lastPathComponent)
            print("Download Finished")

        }
    }

    override func numberOfStickers(in stickerBrowserView: MSStickerBrowserView) -> Int {
        return self.Stickers.count
    }

    override func stickerBrowserView(_ stickerBrowserView: MSStickerBrowserView, stickerAt index: Int) -> MSSticker {
        return self.Stickers[index]
    }

    private func loadStickers() -> [MSSticker] {

        var Stickers = [MSSticker]()

        for stickerName in self.stickerNames {

            guard let url = Bundle.main.url(forResource: stickerName, withExtension: "jpg") else {
                fatalError("Image does not exist")
            }

            let sticker = try! MSSticker(contentsOfFileURL: url, localizedDescription: stickerName)

            Stickers.append(sticker)
        }

        return Stickers

    }


}

同样，该应用程序应显示google徽标贴纸，但不显示任何内容。是的，我已经将此代码连接到了VC。