Join Todd Perkins for an in-depth discussion in this video Viewing the app's code structure, part of Programming for Non-Programmers: iOS 8.
- Now that we've discussed the basics of programming,…we've covered enough to build a simple calculator app.…Before we build that app, I want to do an overview…of our code structure, so you know…where we're going from the beginning.…So here's our app plan.…You want to tap numeric buttons to create an initial number.…Then we want to tap a mode button,…either a plus or minus to choose addition or subtraction.…Then we'll be able to tap more numbers…to add or subtract from the initial number.…
Then we'll tap the equals button to see the total.…And at any point if we want to,…we should be able to tap the C button…to clear the screen and reset the calculator to zero.…In building our app, here are our key instance variables.…We're going to have "total,"…that's going to hold the numeric values entered.…That's going to be an integer.…"Mode" will be an integer, and that will hold whether…the user is adding or subtracting.…In other words, which mode the calculator will be in.…
Then we have, "lastButtonWasMode," that's a boolean,…
If you find you'd like to learn more, see iOS App Development Essential Training, Foundations of Programming: Fundamentals, or any of the other programming courses in our library.
- Installing Xcode
- Creating an Xcode project
- Configuring the iOS Simulator
- Understanding variables
- Connecting visual objects to variables
- Understanding functions, methods, and selectors
- Connecting a button to a method
- Using conditional statements
- Setting up the user interface
- Connecting code elements to build an app
Skill Level Beginner
1. Setting Up Your Coding Environment
Creating an Xcode project3m 38s
2. Programming Building Blocks: Variables
3. Programming Building Blocks: Functions
4. Programming Building Blocks: Conditional Statements
Using conditional statements4m 11s
5. Building Your First Full Application
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