Access every button in a UIView on the iPhone

Question

What I want to do is ideally loop through all buttons in a UIView (I have a lot, over 40 buttons), and depending on the tag, change the image that the button is displaying. Does anyone know how I can do this?

Thanks!!!!

Answer 1

Use the subview property of the UIView containing the buttons. For each UIView element in that NSArray, inspect the tag property. If the tag matches what your logic needs, change the image displayed in that UIView instance - which in this case is one of the buttons.

Answer 2

I would say use the subviews property, as devilaether said, but do an additional check to make sure the subview is a UIButton before you do anything else with it:

for(UIView *view in [rootView subviews]) {
    if([view isKindOfClass:[UIButton class]]) {
        if([view tag] == 0) {
            // First image
        } /* ... */
        else {
            NSLog("didn't recognize tag");
        }
     } else {
        NSLog("view is not a button");
     }
}

You could also make your life easier if you stored an NSArray somewhere with the UIButtons you wanted to iterate over; this would take out the isKindOfClass: check. See the NSObject protocol for more info.