ios - Swift 数据写入 Document 目录维护目录结构

Question

我正在从 firebase 下载文件。假设请求网址如下

social-cam-storage/albm-72/owner-2/1484043313786.jpeg

我可以使用以下代码下载文件

func downloadFile(url : String) {
        let storageR = FIRStorage.storage().reference(withPath: url)
        let maxSize : Int64 = 3 * 1024 * 1024  // 3MB

        storageR.data(withMaxSize: maxSize) { (data, error) in
            if error != nil {
                print(error.debugDescription)
                return
            }

            print(data!)
        }

    }

现在我需要存储这些数据来维护 url 的目录结构

我已经尝试过

let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
print(FileManager.default.createFile(atPath: "\(documentsURL.absoluteString)/\(url)", contents: data!, attributes: nil))

但是我错了

那么如何解决这个问题或者有其他方法可以保存吗？

Answer 1

你尝试过这样的事情吗？ :

如果您已经有字符串形式的确切路径:

try? data.write(to: URL(fileURLWithPath: path), options: [.atomic])

如果您需要路径，有几种方法:

func saveFile() {
    let filePath = getDocumentsURL().absoluteString.appending(path)
    try? data.write(to: URL(fileURLWithPath: filePath), options: [.atomic])
}

func getDocumentsURL() -> URL {
    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    return documentsURL
}

您也可以尝试保存文件名，然后在需要时加载:

func fileInDocumentsDirectory(_ filename: String) -> String {
    let fileURL = getDocumentsURL().appendingPathComponent(filename)
    return fileURL.path
}

// To save file
func saveFile(data: Data) {
    let fileName:String = "createUniqueFileName"
    let filePath = fileInDocumentsDirectory(fileName)
    saveData(data, filePath)
}

// To load file with saved file name
func loadFile(fileName: String) {

    if let loadedData = loadData(fileName) {
         // Handle data however you wish
    }

}

func saveData(_ data: Data, path: String ) {

    try? data.write(to: URL(fileURLWithPath: path), options: [.atomic])

}

func loadData(_ path: String) -> Data? {

    let data:Data? = try? Data(contentsOf: URL(fileURLWithPath: path))

    return data

}