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Mastering iOS 14 Programming

You're reading from   Mastering iOS 14 Programming Build professional-grade iOS 14 applications with Swift 5.3 and Xcode 12.4

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Product type Paperback
Published in Mar 2021
Publisher Packt
ISBN-13 9781838822842
Length 558 pages
Edition 4th Edition
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Authors (3):
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Mario Eguiluz Alebicto Mario Eguiluz Alebicto
Author Profile Icon Mario Eguiluz Alebicto
Mario Eguiluz Alebicto
Chris Barker Chris Barker
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Chris Barker
Donny Wals Donny Wals
Author Profile Icon Donny Wals
Donny Wals
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Table of Contents (22) Chapters Close

Preface 1. Chapter 1: What's New in iOS 14? 2. Chapter 2: Working with Dark Mode FREE CHAPTER 3. Chapter 3: Using Lists and Tables 4. Chapter 4: Creating a Detail Page 5. Chapter 5: Immersing Your Users with Animation 6. Chapter 6: Understanding the Swift Type System 7. Chapter 7: Flexible Code with Protocols, Generics, and Extensions 8. Chapter 8: Adding Core Data to Your App 9. Chapter 9: Fetching and Displaying Data from the Network 10. Chapter 10: Making Smarter Apps with Core ML 11. Chapter 11: Adding Media to Your App 12. Chapter 12: Improving Apps with Location Services 13. Chapter 13: Working with the Combine Framework 14. Chapter 14: Creating an App Clip for Your App 15. Chapter 15: Recognition with Vision Framework 16. Chapter 16: Creating Your First Widget 17. Chapter 17: Using Augmented Reality 18. Chapter 18: Creating a macOS app with Catalyst 19. Chapter 19: Ensuring App Quality with Tests 20. Chapter 20: Submitting Your App to the App Store 21. Other Books You May Enjoy

Combining Publishers, Subscribers, and Operators

In this section, we are going to mix the concepts of the previous section altogether in a real-world example feature. Let's assume that we have an app that contains a newsletter, and we allow the users to subscribe to the newsletter by entering their email address, using two UITextFields: the Email and Repeat Email fields. Let's assume that in our business logic, we need to check that the email is correct, and we are going to do the following checks:

  • Local check: We will ask users to repeat the email address twice, and both should be the same.
  • Local check: The email should contain an "@".
  • Local check: The email should be five characters long, at least.
  • Remote check: We will also assume that we have a remote method to check in the backend that the email is unique, meaning it doesn't exist yet.

Once all these conditions match, we will enable a Sign-Up button in the user interface. We...

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