objective-c Using Cordova dropbox pugin how to download files from dropbox server by selecting a particular file from a list of files

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Xcode

Cordova

I need to know how can i download a file from a list of files,without giving the specific file name in the code.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex: 0]; // Get documents directory

NSString *localPath = [documentsDirectory stringByAppendingPathComponent:@"somefile.txt"];

NSString *dropBoxFile = @"/somefile.txt";

This is how i created for a single file of which i know the name.Anyone who know the solution to select a file from a list of files please help me.