Variables and constants are like containers that contain any data. When you want to declare a variable, you have to use the var keyword. Let's declare each of the data types we did earlier, but, this time, using variables and constants instead.
Variables and constants – where data is held
by Donny Wals, Craig Clayton
Complete iOS 12 Development Guide
- Title Page
- Copyright and Credits
- About Packt
- Contributors
- Preface
- Getting Familiar with Xcode
- Building a Foundation with Swift
- Playgrounds – an interactive coding environment
- Data types – where it all starts
- Type safety and type inference
- Operations with our integers
- Summary
- Building on the Swift Foundation
- Digging Deeper
- Digging into Collections
- Starting the UI Setup
- Setting Up the Basic Structure
- Building Our App Structure in Storyboard
- Finishing Up Our App Structure in Storyboard
- Designing Cells
- Getting Started with the Grid
- Adding Core Data to Your App
- Fetching and Displaying Data from the Network
- Being Proactive with Background Fetch
- Syncing Data with CloudKit
- Using Augmented Reality
- Improving Apps With Location Services
- Making Smarter Apps with CoreML
- Tracking Activity Using HealthKit
- Streamlining Experiences with Siri
- Using Media in Your App
- Implementing Rich Notifications
- Gaining a deep understanding of notifications
- Scheduling and handling notifications
- Implementing grouped notifications
- Implementing notification extensions
- Summary
- Questions
- Further reading
- Instant Information with a Today Extension
- Exchanging Data With Drag And Drop
- Improved Discoverability with Spotlight and Universal Links
- Extending iMessage
- Discovering Bottlenecks with Instruments
- Offloading Tasks with Operations and GCD
- Submitting Your App to the App Store
- Appendix
- Other Books You May Enjoy
Variables and constants – where data is held
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