Question

How do I compare the id argument to an IBAction, to a instance pointer?

IBOutlet UITextField * tw1;
IBOutlet UITextField * tw2;

the == doesn’t look to work:

- (IBAction) editingDidEnd:(id) sender 
{

    if (sender == tw1) {
       ...
    }
    if (sender == two) {
       ...
    }
}

id is something like (void*), so the comparison of these two pointers should yield true, because both point to the same spot, but it doesn’t.

Answer 1

In this line: (sender == two), “two” is not “tw2”. If that’s not a typo in your question, it’s a bug in your program.

If the typo isn’t the problem, something probably isn’t connected the way you think it is. Add these lines to see what’s going on:

NSLog(@"sender: %p, tw1: %p, tw2: %p", sender, tw1, tw2); //changed %x to %p
NSLog(@"sender == tw1: %d", sender == tw1);
NSLog(@"sender == tw2: %d", sender == tw2);

If tw1 and tw2 are 0, you don’t have them connected in Interface Builder.