Question

我试图用：

来保存一个简单的文件

Scanner sc = new Scanner(System.in);

Map<String, String> morsecode = new HashMap<>();
morsecode.put("a", ",-");
morsecode.put("b", "-...");
// will add other letters later

System.out.println("please enter an english sentence:");
String line = sc.nextLine();
for (char ch : line.toLowerCase().toCharArray()) {
    System.out.print(morsecode.get(Character.toString(ch)) + " ");
}
System.out.println();

但无论我选择哪个目录，都会将其保存为

/ Users / jaredearl / Library / Developer / CoreSimulator / Devices / 6D477D99-7741-472D-8D16-4AE6771AF92E / data / Containers / Data / Appli ... file.txt

那个标签会在重新启动时发生变化，当我使用类似的东西时会发生变化：

        if let documents = directories.first {
            if let urlDocuments = URL(string: documents) {

                let urlText = urlDocuments.appendingPathComponent("file.txt")
                print(urlText)
                do {
                    try text.write(to: urlText, atomically: false, encoding: .utf8)
                    print(text)
                }
                catch {}
                true)

            }
        }

然后当我尝试读取我得到的文件时：NSURLConnection完成错误 - 代码-1002

如何让它在重新启动后持续存在？

Answer 1

在swift 3.0中

您可以使用相同的功能在文件中读/写

func storeSyncLog(txtStor:String) {
    let fileName = "a.txt"        
    let dir = try? FileManager.default.url(for: .documentDirectory,in: .userDomainMask, appropriateFor: nil, create: true)
    //If the directory was found, we write a file to it and read it back
    if let fileURL = dir?.appendingPathComponent(fileName).appendingPathExtension("txt") {
        var inString = ""
        do {
            inString = try String(contentsOf: fileURL)
        } catch {
            print("Failed reading from URL: \(fileURL), Error: " + error.localizedDescription)
        }

        //Write something in file

        let outString = inString + "Date:\(Date()) yd : \(txtStor)\n\n"
        do {
            try outString.write(to: fileURL, atomically: true, encoding: .utf8)
        } catch {
            print("Failed writing to URL: \(fileURL), Error: " + error.localizedDescription)
        }
    }
}

希望得到帮助

在应用程序重新启动时保留简单的文本文件

1 个答案: