java - Getting iOS app-private folder Library from the absolute path of Document folder

Question

I need to get the complete path of the "Library" private app folder for iOS app.

In Swift I would access that position with

 let dir = try! FileManager.default.url(for: .libraryDirectory, in: .userDomainMask, appropriateFor: nil, create: true);

and then

 let fileUrl = dir.appendingPathComponent(fileName).appendingPathExtension("json");

I read on StackOverflow that the kind of path is like

file:///var/mobile/Containers/Data/Application/strangenumberslike...EF22-EB33-4B65-9772-67ED7870E3E9/Library/

where the question did refer to "Document" (so the example could be wrong).

My need is getting the Library folder in that form in a cross-platform environment that cannot retrieve it directly, but it has the Document absolute path.

I think that it is just matter of substrings (JAVA), being said that the folder has the same "root".

Maybe

String root=documentPath.substring(0,documentPath.indexOf("Document"));
String libraryPath=root+"/Library";

Is this possible?

Answer 1

等待大神答复