As xmr said above: It's possible in Objective C to convert an NSString csv into 'components separated by string' array.
NSArray* items;
items=[bufferString componentsSeparatedByString:@","];
In case you are interested in csv export having arrived at this thread - as I did - here is an extract of how I exported a csv file.
NSString* fileName = @"Level";
fileName = [fileName stringByAppendingString:levelNumberBeingEdited];
fileName = [fileName stringByAppendingString:@".txt"];
NSString* bufferString=@"";
Buffer String is populated by looping through each data item (not shown) and inserting a comma between each. Finally it's exported.
NSString* homeDir = NSHomeDirectory();
NSString* fullPath = [homeDir stringByAppendingPathComponent:fileName];
NSError* error = nil;
[bufferString writeToFile:fullPath atomically:NO encoding:NSASCIIStringEncoding error:&error];