Swift UIDocumentPickerViewController从iCloud上载txt文件

//参数标签“（contentsOfFile；，encoding；，erro:）”与任何可用的重载不匹配，上出现错误？字符串（内容文件：路径，编码：UTF8，错误：&错误）！：零

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有什么建议吗？如何从iCloud上传不适用于Swift 3的教程

替换

openFile的函数体

@IBAction func iCloudPlayer(_ sender: Any) {
        var documentPicker = UIDocumentPickerViewController(documentTypes: ["public.txt"], in: UIDocumentPickerMode.import)
        documentPicker.delegate = self
        documentPicker.modalPresentationStyle = UIModalPresentationStyle.fullScreen
        self.present(documentPicker, animated: true, completion: nil)
    }

    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL){
        if(controller.documentPickerMode == UIDocumentPickerMode.import){
            let content = openFile(path: url.path, UTF8: String.Encoding.utf8)
            titlePlayerContent.text = content
        }
    }
    func openFile(path:String, UTF8:String.Encoding = String.Encoding.utf8) -> String?{
        var error: NSError?
        return FileManager().fileExists(atPath: path) ? String(contentsOfFile: path, encoding: UTF8, error: &error)! : nil

    }

与

根据Swift 3.x
的新变化，您是否查看了
String
及其
init
方法的Swift 3文档？您的问题与
UIDocumentPickerViewController
或iCloud无关。@ArkadijsArchieMakarenko如果有效，请接受为勾号！
func openFile(path:String, UTF8:String.Encoding = String.Encoding.utf8) -> String?{
        var error: NSError?
        return FileManager().fileExists(atPath: path) ? String(contentsOfFile: path, encoding: UTF8, error: &error)! : nil

    }

func openFile(path:String, UTF8:String.Encoding = String.Encoding.utf8) -> String?{
        if FileManager().fileExists(atPath: path) {
            do {
                let string = try String(contentsOfFile: path, encoding: .utf8)
                return string
            }catch let error as NSError{

                //Handle your error/exception here. I just returned a error as a string. You can return nil or something in this case too.
                return error.localizedDescription
            }
        } else {
            return nil
        }
    }