Question

I have a UIActionsheet with several buttons setup. How would I go about adding a undo function? I’m using UITextfields

Answer 1

Set the appropriate UIActionSheet button to call the undo method on the desired UITextField’s NSUndoManager object. For all UITextField and UITextView objects in iOS 3.0 and higher, there is an undoManager object that can be accessed and used to manage undoing and redoing of operations. The necessary code would go something like this:

(UIActionSheetDelegate method implementation)

- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == /*undo index*/)
        [yourTextField.undoManager undo];
}

EDIT: I suggest you look at the Apple documentation for Undo Managers, it should help you further with this should you need it.