Question

我遇到了网址的问题，这是我的代码;

我的功能;

func getMahalle (addres: String){

    let urlString = adres
    let url = URL(string: urlString)// I'm getting error right after this line when have urlString ı,İ,ş,Ş,ü,Ü,ç,Ç,ğ,Ğ,ö,Ç , url = nil after this line

    let task = URLSession.shared.dataTask(with: url!) { (data,urlresponse, error) in
        if error != nil {

            print(error!)

        }

        else {

            do {

                let json = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary

                if let table = json["Table"] {

                    for var i in 0..<(table as AnyObject).count {

                        let tableDict = (table as! Array<AnyObject>) [i] as! [String: Any]

                        let iller = tableDict["site_mahalle"]
                        self.mahallelerDizi.append(iller as! String)

                                                    DispatchQueue.main.async {
                            self.pickerView.reloadAllComponents()
                        }

                    }
                }
            }
            catch {

            }

        }

    }
    task.resume() }

致电;

getMahalle(addres: "http://alfa.reelim.com/ReelService.asmx/getMahalle?ilce=nilüfer")

错误是：致命错误：在解包可选值时意外发现nil

我不明白为什么url = nil。

Answer 1

override func viewDidLoad() {
    super.viewDidLoad()


let secilenIlce = UserDefaults.standard.object(forKey: "secilenIlce") as? NSString
    if let yansiyan = secilenIlce {

        degerMahalle = yansiyan as String
    } mahalleCek(adres: "http://alfa.reelim.com/ReelService.asmx/getMahalle?ilce=\(degerMahalle)")}

Answer 2

转义不支持的字符：

guard let escaped = urlString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed),
      let url = URL(string: escaped)
    else {
        fatalError("Better handle the error")
}

Answer 3

Adding percent encoding应该做的工作：

let urlString = adres.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlFragmentAllowed)
let url = URL(string: urlString!) // Take care of forced wrapping

// Here this url: http://alfa.reelim.com/ReelService.asmx/getMahalle?ilce=Ö
// will become this: http://alfa.reelim.com/ReelService.asmx/getMahalle?ilce=%C3%96
let task = URLSession.shared.dataTask(with: url!) // Take care of forced wrapping
{ 
   (data,urlresponse, error) in

    // parsing here
}

doc的一部分：

重要您不能在已经存在的字符串上调用此方法百分比编码。 在已经存在的字符串上调用此方法百分比编码将导致百分比编码的百分比字符序列被百分比编码两次。

和

返回值如果转换，则返回已编码的字符串或nil 是不可能的。

网址字符问题

3 个答案: