如何从 API 添加标志图像？

Question

import UIKit

class DetailsViewController: UIViewController {
   @IBOutlet weak var alpha3CodeLbl: UILabel!
   @IBOutlet weak var regionLbl: UILabel!
   @IBOutlet weak var flagImage: UIImageView!

    var countrie:jsonStruct?


    override func viewDidLoad() {
        super.viewDidLoad()
        alpha3CodeLbl.text = countrie?.alpha3Code
        regionLbl.text = countrie?.region
        let urlString = "http://restcountries.eu/rest/v2/all" + (countrie?.flag)!

        flagImage.downloadedFrom(url: url!)


    }
}

extension UIImageView {
    func downloadedFrom(url: URL, contentMode mode: UIViewContentMode = .scaleAspectFit) {
        contentMode = mode
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard
                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
                let data = data, error == nil,
                let image = UIImage(data: data)
                else { return }
            DispatchQueue.main.async() {
                self.image = image
            }
            }.resume()
    }
    func downloadedFrom(link: String, contentMode mode: UIViewContentMode = .scaleAspectFit) {
        guard let url = URL(string: link) else { return }
        downloadedFrom(url: url, contentMode: mode)
    }
}

我正在尝试从这个 API http://restcountries.eu/rest/v2/all 获取标志图像

没有错误，但图像没有出现。但是，如果这里有人可以解决此问题，则没有结果。 拜托，不是万事大吉，尝试用太多方法获取图像但仍然没有结果。

我也试试这个

    let urlString = "http[enter image description
 here][1]://restcountries.eu" + (countrie?.flag)!

Answer 1

需要解决的一些问题。你应该在使用它之前测试 url。

let str = "yourURL"
guard let theUrl = URL(string: str) else { return }

正如@rmaddy 在上面的评论中所提到的，UIImage 不适用于 SVG 文件。改用 UIWebView

var request = URLRequest(url:theUrl)
webView.loadRequest(request)

或尝试使用 SVGKit 来转换 SVG，如 here 所述