如何在不知道Swift3中的用户名的情况下获取用户主目录路径(Users /“user name”)

let filename = "random.txt"
let filePath = "/Users/johnDoe"
let replacementText = "random bits of text"
do {

 try replacementText.write(toFile: filePath,atomically: true,encoding: .utf8)

}catch let error as NSError {
print(error: + error.localizedDescription)
}

但我希望能够拥有普遍的道路.就像是

let fileManager = FileManager.default
    let downloadsURL =  FileManager.default.urls(for: .downloadsDirectory,in: .userDomainMask).first! as NSURL
    let downloadsPath = downloadsURl.path

但对于JohnDoe文件夹.我无法找到有关如何执行此操作的任何文档.我能找到的最接近的东西是使用NSHomeDirectory().而且我不确定如何在这种情况下使用它.

当我尝试添加它…

let fileManager = FileManager.default
    let downloadsURL =  FileManager.default.urls(for: NSHomeDirectory,in: .userDomainMask).first! as NSURL
    let downloadsPath = downloadsURl.path

我收到一个错误：

我试过了.NSHomeDirectory,.NSHomeDirectory(),NShomeDirectory,NShomeDirectory()