无法强制将 string 类型的值转换为 url 类型

Question

我收到错误 Cannot conversion value of type string to type url in coercion at this Constant。感谢您提前的帮助:)

**let safariVC = SFSafariViewController(url: JobUrl as URL)**

import UIKit
import SafariServices


class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    //Indeed API Query as JSON
   final let urlString = "http://api.indeed.com/ads/apisearch?publisher=9727336427429597&as_phr=&as_any=&as_not=&as_ttl=&as_cmp=&jt=parttime&st=&salary=&radius=25&l=32304&fromage=any&limit=25&sort=&psf=advsrch=&userip=1.2.3.4&useragent=Mozilla/%2F4.0%28Firefox%29&v=2&format=json"


    @IBOutlet weak var tableView: UITableView!

    var jobTitleArray = [String]()
    var snippetArray = [String]()
    var companyArray = [String]()
    var cityArray = [String]()
    var jobUrlArray = [String]()

//    url = URL(string: epsDictionary["link"] as! String)





    override func viewDidLoad() {
        super.viewDidLoad()

        self.downloadJsonWithURL()


        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        //dispose of any resources that can be recreated
    }

    //fetch Json
    func downloadJsonWithURL() {
        let url = NSURL(string: urlString)
        URLSession.shared.dataTask(with: (url as? URL)!, completionHandler: {(data, response, error) ->
            Void in

            if let JsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments)
                as? NSDictionary {
                print(JsonObj!.value(forKey: "results")!)

                if let resultsArray = JsonObj!.value(forKey: "results") as? NSArray {
                    for result in resultsArray {
                        if let resultDict = result as? NSDictionary {

                            if let jobTitle = resultDict.value(forKey: "jobtitle") {
                                self.jobTitleArray.append(jobTitle as! String)
                            }
                            if let snippet = resultDict.value(forKey: "snippet") {
                                self.snippetArray.append(snippet as! String)
                            }
                            if let company = resultDict.value(forKey: "company") {
                                self.companyArray.append(company as! String)
                            }
                            if let city = resultDict.value(forKey: "formattedRelativeTime") {
                                self.cityArray.append(city as! String)
                            }
                            if let jobUrl1 = resultDict.value(forKey: "url") {
                                self.jobUrlArray.append(jobUrl1 as! String)
                            }


                            OperationQueue.main.addOperation({ 
                                self.tableView.reloadData()
                            })
                        }

                    }
                }

            }

        }).resume()
    }


    func downloadJsonWithTask() {
        let url = NSURL(string: urlString)

        var downloadTask = URLRequest(url: (url as? URL)!, cachePolicy: URLRequest.CachePolicy.reloadIgnoringCacheData, timeoutInterval: 20)

        downloadTask.httpMethod = "Get"


        URLSession.shared.dataTask(with: (url as? URL)!, completionHandler: {(data, response, error) ->
        Void in

        let jsonData = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments)

            print(jsonData!)

        }).resume()

    }


     var jobToUrl = URL(string: "http://www.indeed.com/viewjob?jk=5de353a4c580dce0&qd=8FiWEXDXvmdNb_GJC9BAOpLFMiNO7rztIOPtGp_-cISTa1VWcmBigetsBoobMSCXdNyr-z6ge7UiYg2Mx15EH6m1Aj3izkOw87NHJgxznYA&indpubnum=9727336427429597&atk=1bchrhjof5hgga1k")



    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        tableView.deselectRow(at: indexPath, animated: true)


        print("USER SELECTED CELL")
        let JobUrl = jobUrlArray[indexPath.row]


        **let safariVC = SFSafariViewController(url: JobUrl as URL)**
        self.present(safariVC, animated: true, completion: nil)



    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return jobTitleArray.count
    }


     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! TableViewCell
        cell.jobTitle.text = jobTitleArray[indexPath.row]
        cell.jobSummary.text = snippetArray[indexPath.row]
        cell.employerName.text = companyArray[indexPath.row]
        cell.cityName.text = cityArray[indexPath.row]
        cell.ApplyButton.text = jobUrlArray[indexPath.row]



//        let imageUrl = NSURL(string: imageUrlArray[indexPath.row])

//        if imageUrl != nil {
//            let data = NSData(contentsOf: (imageUrl as? URL)!)
//            cell.imageView?.image = UIImage (data: data as! Data)
//        }

        return cell

    }

}

Answer 1

您无法将字符串转换为 URL。投射只是说“好吧，这个盒子里的东西。它不是一个字符串，它是一个 URL。” 如果该对象不能兼作其他类，则转换失败。

您需要使用字符串作为输入来创建 URL：

let url = URL(string: myString)