How do I allow the user to tweet his/her high score?

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Xcode

I have watched a few tutorials on tweeting from an iOS app but they only show tweeting images or urls. So far all I have is

-(IBAction)ShareTW {
    if([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]){
        slComposeViewController = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
        [slComposeViewController addImage:[UIImage imageNamed:@""]];
        
    }
}

instead of adding the image how can I make it into a string along the lines of "Hey guys check out my new high score on the app! I score a %i", HighScore? I tried to type in NSString instead of addImage, but that's not an option and I am not sure if slComposeViewController is needed, I can only assume it is because I have not found anything on this topic.