How to get file path? Loading documents in Document based app

问题

I want to be able to save and load documents, so I'm trying to use these methods:

[NSKeyedArchiver archiveRootObject: rootObject toFile: @"myMap.map"];

rootObject = [NSKeyedUnarchiver unarchiveObjectWithFile:@"myMap.map"];

What am I meant to put as the file argument? I just have a constant string for now, but that means I can only load one file, I assume there's a way to get the user's selection from the open panel to be the argument, but how?

回答1:

Use NSFileManager:

NSArray *allFileNames = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:@"SomeDirectory"];

回答2:

I found the solution, I now use this method:

[NSKeyedArchiver archivedDataWithRootObject:rootObject];

Which saves data to the file the user choses in the save/load panel. I still don't know how to access the document's path, but this works good enough.

来源：https://stackoverflow.com/questions/12723032/how-to-get-file-path-loading-documents-in-document-based-app