withSecurityScope not available in NSURL.BookmarkCreationOptions

Question

im am trying to save a url as a bookmark to persist access to files on an iphone. To do this i am calling the bookmarkData function. But to prevent errors i have encounterd such as:

Error Domain=NSCocoaErrorDomain Code=260 "The file couldn’t be opened because it doesn’t exist."

I am trying to add the withSecurityScope option when calling the function. Although I have found multiple references to this option in the Apple documentation I can't seem to be able to find it when using NSURL.BookmarkCreationOptions.withSecurityScope. It only says 'withSecurityScope' is unavailable. I have also looked through the class definition but still no luck.

I hope someone can help me out here. Thanks a lot!

Answer 1

There are two phases.

1. You have to create the bookmark data from the url after getting permission (for example in NSOpenPanel) and save it

   let data = try url.bookmarkData(options: [.withSecurityScope])
   UserDefaults.standard.set(data, forKey: "mySecureURL")
   

2. To use it get the data from UserDefaults and resolve it

   guard let data = UserDefaults.standard.data(forKey: "mySecureURL") else { // do some error handling }
   var isStale = false
   let url = try URL(resolvingBookmarkData: data, options:[.withSecurityScope], bookmarkDataIsStale: &isStale) 
   if isStale { // create new bookmark data from the current url and save it again described in 1. }
   

   Now you can use url but you have to wrap it in these two lines

   url.startAccessingSecurityScopedResource()
   // do something with `url`
   url.stopAccessingSecurityScopedResource()