ios - SDWebImage错误下载的图像有0像素

Question

使用SDWebImage最新的Swift库版本在加载几个URL时出现以下错误

下载的图像有0像素

以下是代码

if let url = URL(string: storeImgStr.encoded), !(storeImgStr.isEmpty) {
        self.storeImg.sd_setImage(with: url, placeholderImage: UIImage(named: Constants.storeImagePlaceorderImage)) {
            (image, error, cahce, url) in
            if(error != nil) {
            }
        }

    }
    else {
        self.storeImg.image = UIImage(named: Constants.storeImagePlaceorderImage)

    }

由于政策问题，我的网址看起来像这样 无法共享确切的网址域名

https://tximages.mydomain.in/retailers_data_v2/retailer/320/3306-1-Aviator.jpg

以下是错误代码

Error Domain=NSURLErrorDomain Code=-1100 "(null)"

另外，我也可以在网络浏览器中打开图像URL。

这到底是什么问题？

以下扩展用于编码url

extension String {
var encoded: String {
    return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
}
}

更新:能够在Chrome浏览器中打开上方图片网址，但由于某种原因而无法在Safari浏览器中打开它吗？

Answer 1

-1100表示NSURLErrorFileDoesNotExist。还有一种可能是服务器不返回文件to specific country或由于urlString中的specific symbols而导致。在这种情况下，您可以应用以下编码:stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding。
您还可以按照SDWebImageRetryFailed中所述使用documentation，更多有关this flag的信息:

storeImg.sd_setImage(with: urlEncoded, placeholderImage: UIImage(named: Constants.storeImagePlaceorderImage), options: .retryFailed) { // handle result completion }

您可以使用以下方法测试断开的链接:

import UIKit
import SDWebImage
import WebKit

extension String {
    var encoded: String {
        return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
    }
}

class ViewController: UIViewController {
    let testURL = "https://i.groupme.com/638x640.jpeg.d4f31c747b534baca03d12db5a2b6193"
    let testURLShouldEncode = "https://via.placeholder.com/468x60?text=Visit Blogging.com Now"

    var storeImg: UIImageView!
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        configureUI()

        if let urlEncoded = URL(string: testURLShouldEncode.encoded), !(testURL.isEmpty) {
            storeImg.sd_setImage(with: urlEncoded, placeholderImage: UIImage(named: Constants.storeImagePlaceorderImage)) { 
                [unowned self] (image, error, cahce, url) in
                print("image \(String(describing: image))")
                print("error \(String(describing: error?.localizedDescription))")
                print("cache \(cahce)")
                print("url \(String(describing: url))")
                if (error != nil) {
                    let request = URLRequest(url: urlEncoded)
                    self.webView.load(request)
                }
            }
        } else {
            self.storeImg.image = UIImage(named: Constants.storeImagePlaceorderImage)
        }
    }

    func configureUI() {
        storeImg = UIImageView()
        storeImg.contentMode = .center
        storeImg.translatesAutoresizingMaskIntoConstraints = false

        webView = WKWebView()
        webView.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(storeImg)
        view.addSubview(webView)

        view.backgroundColor = .blue
        storeImg.backgroundColor = .yellow
        webView.backgroundColor = .orange

        storeImg.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
        storeImg.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        storeImg.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        storeImg.heightAnchor.constraint(equalToConstant: 300).isActive = true

        webView.topAnchor.constraint(equalTo: storeImg.safeAreaLayoutGuide.bottomAnchor).isActive = true
        webView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        webView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
        webView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
    }
}