UIDocumentPickerViewController导入SSL证书

Question

如何使用UIDocumentPickerViewController导入SSL证书？

我正在做这样的事情：

let documentPicker: UIDocumentPickerViewController = UIDocumentPickerViewController(documentTypes: ["public.item"], in: UIDocumentPickerMode.import)
documentPicker.delegate = self
documentPicker.modalPresentationStyle = .formSheet

if #available(iOS 11.0, *) {
    documentPicker.allowsMultipleSelection = false
}

UINavigationBar.appearance().tintColor = .green
self.present(documentPicker, animated: true, completion: completion)

但.cer文件总是禁用以选择它：

另外，我找不到一种方法来导入没有扩展名的文件。

Answer 1

这就是我的工作方式。首先，我必须导入移动核心服务：

import MobileCoreServices

然后，这是我实例化UIDocumentPickerViewController：

的方式

let types: NSArray = NSArray(object: kUTTypeX509Certificate as NSString)
let documentPicker: UIDocumentPickerViewController = UIDocumentPickerViewController(documentTypes: types as! [String], in: UIDocumentPickerMode.import)

顺便说一下，我只能将它与iCloud Drive一起使用，它显然不会与Google Drive一起使用http://www.openradar.me/24187873