Question

I have i IBAction and it’s connected with a button in .xib. But for a action o needed this code;

- (void) reportScore: (int64_t) score forCategory: (NSString*) category 
{
    GKScore *scoreReporter = [[GKScore alloc] initWithCategory:category];   
    scoreReporter.value = counter;
    [scoreReporter reportScoreWithCompletionHandler: ^(NSError *error) 
     {
         [self callDelegateOnMainThread: @selector(scoreReported:) withArg: NULL error: error];

         NSLog(@"Nice: %d", counter);  

     }];
}

Is there a way to connect my button with the void? Or something like that?

- (IBAction) subScore {
//data
}

Answer 1

IBAction(and IBOutlet) is just used to let XCode’s Interface Builder(IB) know that there’s a function exist. If you want use void, okay, but you’ll not get the function shown in Interface Builder.

IBAction is a special keyword that is used only to tell Xcode(Interface Builder) to treat a method as an action for target-action connections. IBAction is defined to void.

IBOutlet is a special keyword that is used only to tell Xcode(Interface Builder) to treat the object as an outlet. It’s actually defined as nothing so it has no effect at compile time.

You can set the function(which is defined with void, and note IBAction is okay either, but needless here) to your button target like this:

[yourButton addTarget:self action:@selector(yourButtonFunction:) forControlEvents:UIControlEventTouchUpInside];

Generally, if you create your code programmatically(without using XCode’s Interface Builder), you do not need IBOutlet or IBAction anymore. 😉