如何将文件写入位于Swift 4中Apple的Files App的文件夹？ [英] How to write a file to a folder located at Apple's Files App in Swift 4?

问题描述

我的Xcode项目中有一个XML文件，我想先将它保存到磁盘，其次我怎么知道我是否成功保存了它？这是正确的方法吗？使用模拟器我导航到iOS 11中的新文件文件夹，我看不到它，但我不确定它是否应该存在？

I have an XML file in my Xcode Project, and I'm trying to first save it to disk, and secondly how can I tell if I've successfully saved it? Is this the proper approach? Using the simulator I navigated to the new "Files" folder in iOS 11 and I don't see it but I'm not sure if it should be there or not?

guard let path = Bundle.main.url(forResource: "sample", withExtension: "xml") else {print("NO URL"); return}
    let sample = try? Data(contentsOf: path)


print("sample XML = \(String(describing: sample?.debugDescription))")

//put xml file on the device
let filename = getDocumentsDirectory().appendingPathComponent("sample.xml")
do {
    try sample?.write(to: filename)
} catch {
    print("ERROR")
}

更新以包含我的支票如果文件存在：

updated to include my check if file exists:

 //check if file exists
    let checkPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let url = URL(fileURLWithPath: checkPath)
let filePath = url.appendingPathComponent("sample.xml").path
let fileManager = FileManager.default
if fileManager.fileExists(atPath: filePath) {
    print("FILE AVAILABLE")
} else {
    print("FILE NOT AVAILABLE")
}

推荐答案

您可以使用UIDocumentInteractionController和le用户选择共享网址时要保存文件的位置。用户只需选择保存到文件并选择保存要导出的文件的目录。您可以使用UIDocumentInteractionController来共享位于App包内，文档目录或可从您的应用程序访问的其他文件夹中的任何文件类型。

You can use UIDocumentInteractionController and let the user select where he wants to save your file when you share your url. The user just needs to select save to files and choose which directory to save the file you are exporting. You can use UIDocumentInteractionController to share any file type located inside your App bundle, at your Documents directory or another folder accessible from your App.

class ViewController: UIViewController {
    let documentInteractionController = UIDocumentInteractionController()
    func share(url: URL) {
        documentInteractionController.url = url
        documentInteractionController.uti = url.typeIdentifier ?? "public.data, public.content"
        documentInteractionController.name = url.localizedName ?? url.lastPathComponent
        documentInteractionController.presentOptionsMenu(from: view.frame, in: view, animated: true)
    }
    @IBAction func shareAction(_ sender: UIButton) {
        guard let url = URL(string: "https://www.ibm.com/support/knowledgecenter/SVU13_7.2.1/com.ibm.ismsaas.doc/reference/AssetsImportCompleteSample.csv?view=kc") else { return }
        URLSession.shared.dataTask(with: url) { data, response, error in
            guard let data = data, error == nil else { return }
            let tmpURL = FileManager.default.temporaryDirectory
                .appendingPathComponent(response?.suggestedFilename ?? "fileName.csv")
            do {
                try data.write(to: tmpURL)
            } catch { print(error) }
            DispatchQueue.main.async {
                self.share(url: tmpURL)
            }
        }.resume()
    }
}

extension URL {
    var typeIdentifier: String? {
        return (try? resourceValues(forKeys: [.typeIdentifierKey]))?.typeIdentifier
    }
    var localizedName: String? {
        return (try? resourceValues(forKeys: [.localizedNameKey]))?.localizedName
    }
}

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