Sometimes, we are extremely lucky and have the possibility to follow best practices as we kick off a project. If we start writing object-oriented code from scratch, we can take advantage of all the features that we used in our examples throughout this book. As the requirements evolve, we might need to further generalize or specialize the blueprints. However, as we started our project with an object-oriented approach and by organizing our code, it is easier to make adjustments to the code.
Most of the time, we aren't extremely lucky and have to work on projects that don't follow best practices, and we, in the name of agility, generate pieces of code that perform similar tasks, but without decent organization. Instead of following the same bad practices that generate error-prone, repetitive, and difficult-to-maintain code, we can use the features provided by Xcode and additional helper tools to refactor existing code and generate...