UIDocumentPickerViewController 从 iCloud 上传 txt 文件答案

【问题标题】：UIDocumentPickerViewController upload txt file from iCloudUIDocumentPickerViewController 从 iCloud 上传 txt 文件
【发布时间】：2016-11-28 00:07:55
【问题描述】：

@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

    }

//参数标签'(contentsOfFile;,encoding;, erro:)' 不匹配任何可用的重载，error on ?字符串（contentsOfFile：路径，编码：UTF8，错误：&error）！ : 无

有什么建议吗？我如何从 iCloud 上传，教程不适用于 Swift 3！

【问题讨论】：

您是否查看过 Swift 3 文档中的 String 及其 init 方法？
你的问题与UIDocumentPickerViewController或iCloud无关。

标签： swift upload icloud

【解决方案1】：

替换openFile的函数体

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

    }

有

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
        }
    }

根据 Swift 3.x

的新变化

【讨论】：

@ArkadijsArchieMakarenko 如果它有效，请接受为勾号！