- Create a segue from a button or other control on the source scene to the destination scene. (If you’re presenting the new screen modally, then often the destination will be a Navigation Controller.)
- Give the segue a unique Identifier. (It only has to be unique in the source scene; different scenes can use the same identifier.)
- Create a delegate protocol for the destination scene.
- Call the delegate methods from the Cancel and Done buttons, and at any other point your destination scene needs to communicate with the source scene.
- Make the source scene implement the delegate protocol. It should dismiss the destination view controller when Cancel or Done is pressed.
- Implement prepareForSegue in the source view controller and do destination.delegate = self;.
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