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文件始终处于禁用状态，无法选择它：

​

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另外，我找不到一种不带扩展名的导入文件的方法。

Answer 1

这就是我让它工作的方式。首先，我必须导入移动核心服务：

import MobileCoreServices

然后，这就是我实例化UIDocumentPickerViewController的方式

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

顺便说一句，我只让它与iCloud Drive一起工作，而不能与Google Drive一起工作，显然是因为一个错误：http://www.openradar.me/24187873