iOS Question InputDialog issues


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So, I found this thread here:

Which gives us an input dialog with OK, and Cancel.

But my objective C knowledge is non existent.

I need to do a couple things, one I need to know when the user pressed cancel, I tried to add a button index == 0 and pass "CANCEL" as a return but it fails to compile as again, my OBJC doesnt exist.

The other thing is, when I dont need a cancel button, if I leave it blank, the button is still there. So i need to fix that somehow.

any ideas?