我得到了它的工作。由于我不需要从扩展名编写文件，我认为我不需要使用 NSFileCoordinator 。结果 NSFileManager 有一个方法 containerURLForSecurityApplicationGroupIdentifier（）用于检索容器URL。

I got it to work. Since I don't need to write the file from the extension, I don't think I need to use NSFileCoordinator. Turns out NSFileManager has a method containerURLForSecurityApplicationGroupIdentifier() for retrieving the container URL.

let manager = NSFileManager()
let containerURL = manager.containerURLForSecurityApplicationGroupIdentifier("group.MyGroupIdentifier")

let filePath = "\(containerURL.path)/config.plist"
let settings = NSDictionary(contentsOfFile: filePath)