Swift and NSCoding

This is a very small example playground on how to use NSCoding with a Swift object.

You can implement NSCoding protocol but your object must use the Objective-C runtime. So you have two options:

1. Use the @objc annotation on the class
2. Extend the NSObject class

NSCoding is implemented by two methods:

• init?(coder: NSCoder) is the constructor to be able to unfroze a serialized object.
• encodeWithCoder(aCoder: NSCoder) will be used to serialize the object with the specified coding.