Summary

In this chapter, we implemented all the calculator’s functionality. We linked all the UI components that we implemented in the previous chapter. First, we provided a means to navigate to and from ResultsView. Then, we checked the salary input to make sure it was above zero and didn’t contain any invalid characters. Once validated, we passed the salary from ContentView to ResultsView. Using the salary, we calculated the tax breakdown in ResultsView, fixed an annoying error, and renamed ContentView to FrontView. Finally, we also implemented a few extra tasks for our tax calculator app.

In the next chapter, we’ll start our next application, which will be a photo gallery for the iPad. We will leverage many of the skills learned already, so feel free to take a moment and go back over anything you didn’t fully understand.