Question : How and where can I save and load a segmented control with NSUserDefaults

How and where can I save and load a segmented control with NSUserDefaults?

I can't really say more than that.

Answer : How and where can I save and load a segmented control with NSUserDefaults

You are supposed to have an action:
-(IBAction) segmentedControlIndexChanged;

In the last link I posted you could find an example of this method. In the example they change a text in a label.

If you wish you can save selectedSegmentIndex in this method.