Question

I just started to learn objective-c and one thing is not clear for me

Ok i have a button in InterFace Builder. I my .h file i have the code;

- (void)startButtonPressed:(id)sender;

How i can 'link' the 'void' to my button to do the action?

Code here is not working how do i need to do that?

    - (void)startButtonPressed:(id)sender { 

//Some stuff in here

    }

Does anyone know how to fix this problem?

Answer 1

IBAction, in fact, is void

http://www.cocoadev.com/index.pl?IBAction

// from <AppKit/NSNibDeclarations.h>
#ifndef IBAction
    #define IBAction void
#endif

It is given so, you won’t mess up actions coming from UI and functions of your class implementation.

To create function connectable with UI, you need to set its type to IBAction

// .h
- (IBAction)startButtonPressed:(id)sender;
// .m
- (IBAction)startButtonPressed:(id)sender { 
   //Some stuff in here
}

which is coorect, as well as

// .m
- (void)startButtonPressed:(id)sender { 
   //Some stuff in here
}

The type in implementation, can be void directly