Adding text file to Xcode project and using it in app

You will need to add the txt file to your project and then read it into memory. Here's a way to read the entire contents at once:

NSString* path = [[NSBundle mainBundle] pathForResource:@"yourTextFile" ofType:@"txt"];
NSError* error = nil;
NSString* data = [NSString stringWithContentsOfFile:path 
                                           encoding:NSUTF8StringEncoding 
                                              error:&error];

if (error) {
    // handle the error condition
} else {
    // continue your processing
}