This is what I've used in the past.
Create an NSArray with all your buttons in it, something like:
NSArray* buttons = @[button1, button2, button3, button4];
Then create a method like this.
- (void) toggleButtons: (id) sender {
for (Button *item in buttons) {
if (item == sender) {
item.selected = !item.selected;
} else {
item.button.selected = NO;
}
}
}
Now call it from each of your button handlers:
- (IBAction) handleButton1:(id) sender {
[self toggleButtons:sender];
<...rest of your code...>
}