如何从特定路径读取文件

Question

我正在尝试从路径（例如：“/Desktop/folder”）读取和写入文件。如果这无法完成，则从 Documents（例如：“/Documents/folder”）。我看到并尝试了几个示例，但问题是该文件位于以下位置：

file:///Users/name/Library/Developer/CoreSimulator/Devices/AE6A47DE-D6D0-49AE-B39F-25C7A2335DC8/data/Containers/Data/Application/09F890C1-081F-46E7-88BC-F8453BAFC1CB/Documents/测试.txt" 0x00006000000af780

即使我在文档甚至项目中都有“Test.txt”。

这是在上述位置读取和写入文件的代码：

 let file = "Test.txt" //this is the file. we will write to and read from it

    let text = "some text" //just a text

    var text2 = ""

    if let dir = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first {

        let fileURL = dir.appendingPathComponent(file)

        //writing
        do {
            try text.write(to: fileURL, atomically: false, encoding: .utf8)
        }
        catch {/* error handling here */print(error)}

        //reading
        do {
             text2 = try String(contentsOf: fileURL, encoding: .utf8)
        }
        catch {/* error handling here */ print(error)}
    }

是否可以从我需要的路径读取和写入文件（例如：“文档/文件夹”）？

Answer 1

所以，就像您现在所做的那样，获取文档目录，并附加您需要的路径：

let file = "Test.txt" //this is the file. we will write to and read from it

guard let dir = FileManager.default.urls(for: .documentDirectory, 
  in: .userDomainMask).first { else return }

let subDir = dir.appendingPathComponent("Folder", isDirectory: true)
let fileURL = subDir.appendingPathComponent(file)

请注意，如果子文件夹“文件夹”不存在，则尝试写入该文件 URL 将失败。如果“文件夹”目录不存在，您必须使用文件管理器 createDirectory 调用之一来创建它。

Answer 2

我找到了解决办法：

  let file = "Test.txt" //this is the file. we will write to and read from it
            let text = "some text" //just a text
            var text2 = ""

            let fileURL = URL(fileURLWithPath: "/Users/name/Documents/Folder/Test.txt")
                //writing
                do {
                    try text.write(to: fileURL, atomically: false, encoding: .utf8)
                }
                catch {/* error handling here */print(error)}
                //reading
                do {
                    text2 = try String(contentsOf: fileURL, encoding: .utf8)
                    var s = ""
                }
                catch {/* error handling here */ print(error)}
            }