Just to give us something to type our experiments into, we will create an extremely simplistic app, one that will present a window into which the user can type a rate of sales tax and a pre-tax price, and will present the resulting price inclusive of sales tax.
It shall be called Sales Tax Calc. I know, it's not a brilliant name.
It is assumed the reader is able to create a new Xcode project from scratch, using Xcode 8 or later. If you are new to Xcode, this would be a good moment to consult one of the many excellent resources out there on getting started with Xcode. We'll wait here for you.
Create a new Xcode project called SalesTaxCalc, setting it to use Storyboards.
Drag four labels and two standard text fields onto the default View Controller's View object:
The two text fields and the label in the right-hand column will need to be connected to these outlets in the...
