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dean1012
Aug 26, 2008, 04:23 PM
Hi all,

I am not having too much trouble creating my interface strictly with XCode. However, I am having a difficult time comprehending how to use Interface Builder. I am positive that if I figure out how, my development process will be tons easier.

I understand how to drag and drop items from the library to a view using Interface Builder. What i'm confused on is how to link objects to code.

What I mean is.... if I drag a button into a view and I have a function in XCode to adds 2 numbers and displays an alert how do I make that function get executed when the button is clicked?

Is the button given an ID accessible by my code and I can access the methods and events of that button to interact with it? Or is there a way in Interface Builder to say "When this button is clicked execute X function"

Thanks in advance,
Jerry Smith



jeremy.king
Aug 26, 2008, 04:43 PM
This is where I am at as well, trying to understand how GUI components communicate with objects.

http://developer.apple.com/documentation/Cocoa/Conceptual/ObjCTutorial/06Controller/chapter_6_section_2.html

Taum
Aug 26, 2008, 05:04 PM
Yes, the documentation you linked explains it pretty well.

Basically, you just tag every ivar you want to see in IB with IBOutlet and declare all your actions, then connect everything in IB. When the xib gets loaded, every variable will reference the connected object as you'd expect.


Note that in CocoaTouch, actions can either take 1 parameter (of type id : the sender of the action) or no parameters at all (most of the time you're not interested in which object sent the action).