This is an iOS App written in Xcode 8 and Swift 3. It uses stack view to build the interface, and should work for all iPhone models. It can handle simple calculations like addition, subtraction, multiplication, and division.
Instructions:
-Use Xcode to open the .proj file, and run the iPhone simulator. The app will start with a launch screen, and will automatically switch to the main app interface.
Credits To: Mark Price (Devslopes), the instructor of Udemy course: iOS 10 & Swift 3: From Beginner to Paid Professional