URL编码Swift iOS

let originalString = "test/test"
let escapedString = originalString.addingPercentEncoding(withAllowedCharacters: . urlQueryAllowed)
print(escapedString!)

extension YourViewController {
    func stringEncode(encodedString: String) {
        let escapedString = 
        encodedString.addingPercentEncoding(with(withAllowedCharacters: .urlHostAllowed)
     print (escapedString!)
   }
}

@IBOutlet weak var textField: UITextField!

@IBAction func buttonPressed (_ sender: Any) {
    stringEncode(encodedString: textField.text)
}