Objective C - Get a class to return a value

I rarely ask questions, but this one is frustrating me as I can not find an answer anywhere!

I just need to call the function in GameChallenges.m and return the value to the view controller. GameChallenges.m will be called by different view controllers, thats why its separate. Please help!

I have a separate class file called GameChallenges.

This has a function/method in it: in the .h

@class StatsViewController;

@interface GameChallenges : NSObject {


    StatsViewController* statsController;
    NSString* challengeTitle;
}

@property (nonatomic, retain) IBOutlet StatsViewController* statsController;
@property (assign) NSString* challengeTitle;

-(NSString*)checkChallenge:(int)challegeID;

@end

in the .m

#import "GameChallenges.h"
#import "StatsViewController.h"

@implementation GameChallenges
@synthesize challengeTitle,statsController;

-(NSString*)checkChallenge:(int)challegeID{
    if(challegeID==1){
        self.challengeTitle = @"Some Text.";
        return challengeTitle;
    }else if(challegeID==2){
        self.challengeTitle = @"Some Other Text.";
        return challengeTitle;
    }
}

From a view controller called StatsViewController I am calling this method

in the .h

@class GameChallenges;

@interface StatsViewController : UIViewController {

        UILabel* challengeIDDescText;
}


@property (nonatomic, retain) IBOutlet UILabel* challengeIDDescText;

@property (nonatomic, retain) IBOutlet GameChallenges* challenges;

@end

in the .m

[challenges checkChallenge:tempString];
challengeIDDescText.text = challenges.challengeTitle;

Your code is quite weird, I'd say this is what's happening:

-[GameChallenges checkChallenge] seems to expect an int and you call it with a variable called tempString that I guess is an NSString *. More likely than not, your method is ending without assigning challengeTitle and without a valid return value. Fix it with return nil as last statement and passing an int.

This kind of problems are very easy to solve using the debugger.

Also, have a look to Apple samples.

I'm beginner in objective-C, however, code in the GameChallenges.m looks weird to me... Wouldn't this be better?

challengeIDDescText.text = [challenges checkChallenge:challengeId];