OS App Development Please complete all the questions and you will get a 12. (6 Point) Name a swift / iOS type is a value type. Name a Swift/ioS type that is a reference type. Explain what happens when a value type variable is assigned a new value. Do not mention parameter passing in your answer. 13. (6 point) when a downcast is necessary what would be the problem if the downcast was not done? Use an example in your explanation. 14. (6 point) The following code is from the ColorViews in-class example. what is the purpose of the function ? what the base class for the type the function is found in? How is it called? override func draw(_rect: CGRect) /Get the context being draw upon let context UIGraphicsGetCurrentContext() Create layer, if necessary checkDrawLayer (context)