swift - UIDocumentPickerViewController 用户选择了哪个云服务？

Question

我想从 Google Drive 和 One Drive 云服务中选择文件，为此我正在使用 UIDocumentPickerViewController

例如:

func didPressOneDriveChoose() {
    let importMenu = UIDocumentPickerViewController(documentTypes: [(kUTTypePDF as String), (kUTTypeJPEG as String), (kUTTypePNG as String)], in: .import)
    importMenu.delegate = self
    importMenu.modalPresentationStyle = .formSheet
    self.show(importMenu, sender: nil)
}

收到委托(delegate)方法的回调:

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]){

    var arrFiles = [Dictionary<String, AnyObject>]()
    for url in urls {
        // returns local document directory URL
        // needs original GoogleDrive or OneDrive URL
    }
}

但我想知道有什么方法可以让用户选择哪个云服务，而且我还想要指向该 URL 的原始 URL？目前，它在点击下载该文件后返回本地文档目录 URL。

Answer 1

你这样初始化:

let importMenu = UIDocumentPickerViewController(documentTypes: [(kUTTypePDF as String), (kUTTypeJPEG as String), (kUTTypePNG as String)], in: .import)

如果你read the documentation在这个特定的选择器模式 .import 上它声明:

The URLs refer to a copy of the selected documents. These documents are temporary files. They remain available only until your application terminates. To keep a permanent copy, move these files to a permanent location inside your sandbox.

.open 似乎更适合您的用例。

The URLs refer to the selected documents. The provided URLs are security-scoped, referring to files outside your app’s sandbox. For more about working with external, security-scoped URLs, see Requirements.

但是由于您只是观察 url 来识别服务，而不是实际尝试手动访问这些文档，因此您不必担心会违反任何要求。因此，将 UIDocumentPickerViewController 初始化更改为:

let importMenu = UIDocumentPickerViewController(documentTypes: [(kUTTypePDF as String), (kUTTypeJPEG as String), (kUTTypePNG as String)], in: .open)

它应该可以工作!