Iphone -- init method of an abstract class
- by William Jockusch
I want to create classes Car, Vehicle, and Airplane with the following properties:
Car and Airplane are both subclasses of Vehicle.
Car and Airplane both have an initWithString method.
The acceptable input strings for Car's and Airplane's initWithString methods do not overlap.
Vehicle is "almost abstract", in the sense that any initialized instance should be either a Car or an Airplane.
It is possible to pass a string into Vehicle and get back an instance of Car, an instance of Airplane, or nil, depending on the input string.
Any particular design pattern I should prefer? In particular for Vehicle's initWithString and/or newVehicleWithString methods.
