how to change button title using object id in IB?

afaik not.
like anything else when you want to connect IB with xcode, you have to make an IBOutlet and you can then access your UI-Element in your code.

btw: you COULD use tags btw, but I think you cannot use the id

 

You would have to loop through all the subviews in the button's superview (possibly recursively) and find a control that is a button and has the tag you're looking for. Unless you have some weird setup of your UI that requires this, don't. Use an IBOutlet.

 

like he said: you loop through the subviews array of the UIView where all those buttons lie on. then you simply check the tag-property of each subview if it is "3" ... if it is, then that is your button and you can do with it whatever you want.

I don't think anyone here will give you the code so you can just copy&paste it, because you should be able to do these things on your on. look at for-loops in objective-c or how to go through arrays in general.

 

The Object ID in IB is only part of IB, it isn't revealed in code.

You set the tag in IB and use it to access the view in code. In your View controller you do something like this

Code:

UIButton* button = (UIButton *)[self.view viewWithTag:myTag];
[button setTitle:myTitle forState:UIControlStateNormal];

 

First, look at the documentation for viewWithTag:, that may clear things up for you.

But, as I said, if this code runs in your view controller then self.view is correct. It just needs to be a view that is at any higher level in the view hierarchy than the view you're looking for, a container view. Normally self.view is the container view for all other views for a view controller.

 

UIWindow is a UIView. Use your window.

In most cases one would have a view that gets added to the window and that would be the main container. This would make switching between view easier. But if you didn't do it that way then just use the window.

 

you shouldn't do that anyway, use a UIViewController ... and ysou should learn objective-c basics btw!