如何正确引用/检索在AppData中创建的临时文件,以便将文件上载到服务器?

使用以下代码从文本文件中获取字符串数据以上载到服务器:

let fileName = "logfile"
let documentDirURL = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)

let fileURL = documentDirURL.appendingPathComponent(fileName).appendingPathExtension("txt")
print("FilePath: \(fileURL.path)")

var readString = "" // Used to store the file contents
do {
    // Read the file contents
    readString = try String(contentsOf: fileURL)
} catch let error as NSError {
    print("Failed reading from URL: \(fileURL), Error: " + error.localizedDescription)
}
print("File Text: \(readString)") // Send 'readString' to server

如果您在运行时动态创建该文件,它将不在您的应用程序包中,因此 Bundle 班级将无法找到它。您看到的目录也是动态生成的,不仅特定于平台,而且特定于设备,因此您不能直接使用文件路径。相反,您必须在运行时从 FileManager 类,如下所示:

guard let documents = FileManager.default.urls(for: .documentsDirectory, in: .userDomainMask).first else{
    // This case will likely never happen, but forcing anything in Swift is bad
    return
}

let logURL = URL(string: "logfile.txt", relativeTo: documents)

do{
    let fileContents = String(contentsOf: logURL)
    // Send your file to your sever here
catch{
    // Handle any errors you might've encountered
}

请注意,我是根据您在答案中粘贴的路径进行猜测的,您将答案放在应用程序的文档目录中。这是一个很好的放置这类东西的地方,但是如果我错了,而您将它放在另一个地方,那么您必须修改此代码以指向正确的位置