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  • Book Overview & Buying iOS 15 Programming for Beginners
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iOS 15 Programming for Beginners

iOS 15 Programming for Beginners

By : Ahmad Sahar, Craig Clayton
4.7 (10)
Buy this Book
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iOS 15 Programming for Beginners

iOS 15 Programming for Beginners

4.7 (10)
By: Ahmad Sahar, Craig Clayton
Buy this Book

Overview of this book

With almost 2 million apps on the App Store, iOS mobile apps continue to be incredibly popular. Anyone can reach millions of customers around the world by publishing their apps on the App Store. iOS 15 Programming for Beginners is a comprehensive introduction for those who are new to iOS. It covers the entire process of learning the Swift language, writing your own app, and publishing it on the App Store. Complete with hands-on tutorials, projects, and self-assessment questions, this easy-to-follow guide will help you get well-versed with the Swift language to build your apps and introduce exciting new technologies that you can incorporate into your apps. You'll learn how to publish iOS apps and work with Mac Catalyst, SharePlay, SwiftUI, Swift concurrency, and much more. By the end of this iOS development book, you'll have the knowledge and skills to write and publish interesting apps, and more importantly, to use the online resources available to enhance your app development journey.
Table of Contents (32 chapters)
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Preface
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Preface
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Who this book is for
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What this book covers
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To get the most out of this book
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Download the example code files
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Code in Action
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Download the color images
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Conventions used
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Get in touch
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Share Your Thoughts
1
Part 1: Swift
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Part 1: Swift
Free Chapter
2
Chapter 1: Getting Familiar with Xcode
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Chapter 1: Getting Familiar with Xcode
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Technical requirements
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Downloading and installing Xcode from the App Store
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Understanding the Xcode user interface
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Running the app in the iOS simulator
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Using an iOS device for development
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Summary
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Invitation to join us on Discord
3
Chapter 2: Simple Values and Types
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Chapter 2: Simple Values and Types
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Technical requirements
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Understanding Swift playgrounds
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Exploring data types
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Exploring constants and variables
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Understanding type inference and type safety
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Exploring operators
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Using the print() statement
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Summary
4
Chapter 3: Conditionals and Optionals
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Chapter 3: Conditionals and Optionals
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Technical requirements
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Introducing conditionals
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Introducing optionals and optional binding
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Summary
5
Chapter 4: Range Operators and Loops
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Chapter 4: Range Operators and Loops
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Technical requirements
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Exploring Range operators
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Exploring Loops
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Summary
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Chapter 5: Collection Types
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Chapter 5: Collection Types
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Technical requirements
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Understanding arrays
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Understanding dictionaries
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Understanding sets
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Summary
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Chapter 6: Functions and Closures
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Chapter 6: Functions and Closures
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Technical requirements
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Understanding functions
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Understanding closures
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Summary
8
Chapter 7: Classes, Structures, and Enumerations
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Chapter 7: Classes, Structures, and Enumerations
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Technical requirements
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Understanding classes
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Understanding structures
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Understanding enumerations
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Summary
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Chapter 8: Protocols, Extensions, and Error Handling
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Chapter 8: Protocols, Extensions, and Error Handling
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Technical requirements
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Understanding protocols
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Understanding extensions
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Exploring error handling
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Summary
10
Part 2: Design
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Part 2: Design
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Chapter 9: Setting Up the User Interface
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Chapter 9: Setting Up the User Interface
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Technical requirements
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Learning useful terms in iOS development
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Touring the Let's Eat app
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Creating a new Xcode project
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Setting up a tab bar controller scene
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Setting up the Launch screen
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Summary
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Invitation to join us on Discord
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Chapter 10: Building Your User Interface
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Chapter 10: Building Your User Interface
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Technical requirements
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Adding a collection view to the Explore screen
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Connecting storyboard elements to outlets in a view controller
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Configuring data source methods for the collection view
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Adding a section header to the collection view
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Configuring storyboard element sizes
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Presenting a view modally
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Summary
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Chapter 11: Finishing Up Your User Interface
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Chapter 11: Finishing Up Your User Interface
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Technical requirements
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Adding a table view to the Locations screen
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Implementing the Restaurant List screen
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Implementing the Restaurant Detail screen
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Implementing the Map screen
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Summary
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Chapter 12: Modifying and Configuring Cells
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Chapter 12: Modifying and Configuring Cells
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Technical requirements
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Modifying the Explore screen section header
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Modifying the exploreCell collection view cell
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Modifying the restaurantCell collection view cell
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Configuring the locationCell table view cell
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Summary
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Part 3: Code
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Part 3: Code
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Chapter 13: Getting Started with MVC and Collection Views
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Chapter 13: Getting Started with MVC and Collection Views
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Technical requirements
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Understanding the Model-View-Controller design pattern
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Exploring controllers and classes
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Summary
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Chapter 14: Getting Data into Collection Views
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Chapter 14: Getting Data into Collection Views
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Technical requirements
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Understanding model objects
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Understanding .plist files
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Creating a structure to represent a cuisine
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Implementing a data manager class to read data from a .plist file
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Displaying data in a collection view
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Summary
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Chapter 15: Getting Started with Table Views
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Chapter 15: Getting Started with Table Views
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Technical requirements
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Understanding table views
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Creating the LocationViewController class
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Adding location data for the table view
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Creating the LocationDataManager class
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Summary
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Chapter 16: Getting Started with MapKit
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Chapter 16: Getting Started with MapKit
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Technical requirements
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Understanding and creating annotations
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Adding annotations to a map view
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Going from the Map screen to the Restaurant Detail screen
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Organizing your code
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Summary
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Chapter 17: Getting Started with JSON Files
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Chapter 17: Getting Started with JSON Files
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Technical requirements
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Getting data from JSON files
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Using data from JSON files in your app
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Configuring the MapDataManager instance to use data from the RestaurantDataManager instance
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Storing a user-selected location
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Passing location and cuisine information to the RestaurantListViewController instance
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Summary
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Chapter 18: Displaying Data in a Static Table View
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Chapter 18: Displaying Data in a Static Table View
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Technical requirements
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Setting up outlets for the RestaurantDetailViewController class
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Displaying data in the static table view
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Passing data to the RestaurantDetailViewController instance
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Summary
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Chapter 19: Getting Started with Custom UIControls
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Chapter 19: Getting Started with Custom UIControls
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Technical requirements
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Creating a custom UIControl subclass
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Adding support for touch events
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Implementing an unwind method for the Cancel button
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Creating the ReviewFormViewController class
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Summary
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Chapter 20: Getting Started with Cameras and Photo Libraries
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Chapter 20: Getting Started with Cameras and Photo Libraries
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Technical requirements
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Understanding filters
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Creating model objects for the Photo Filter screen
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Creating the ImageFiltering protocol
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Creating classes for the Photo Filter screen
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Getting permission to use the camera or photo library
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Summary
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Chapter 21: Understanding Core Data
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Chapter 21: Understanding Core Data
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Technical requirements
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Introducing Core Data
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Implementing Core Data components for your app
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Understanding how saving and loading works
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Updating the ReviewFormViewController class to save reviews
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Updating the PhotoFilterViewController class to save photos
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Displaying saved reviews and photos on the Restaurant Detail screen
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Calculating a restaurant's overall rating
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Summary
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Part 4: Features
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Part 4: Features
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Chapter 22: Getting Started with Mac Catalyst
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Chapter 22: Getting Started with Mac Catalyst
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Technical requirements
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Fixing user interface issues
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Making your app run on all iOS devices
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Updating the app to work on macOS
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Summary
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Chapter 23: Getting Started with SwiftUI
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Chapter 23: Getting Started with SwiftUI
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Technical requirements
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Creating a SwiftUI Xcode project
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Creating the Restaurant List screen
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Adding model objects and configuring navigation
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Using UIKit and SwiftUI Views together
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Completing the Restaurant Detail screen
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Summary
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Chapter 24: Getting Started with Swift Concurrency
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Chapter 24: Getting Started with Swift Concurrency
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Technical requirements
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Understanding Swift Concurrency
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Examining an app without concurrency
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Updating the app using async/await
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Improving efficiency using async-let
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Updating RestaurantListViewController to use async/await
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Summary
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Chapter 25: Getting Started with SharePlay
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Chapter 25: Getting Started with SharePlay
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Technical requirements
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Understanding SharePlay
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Exploring the ShareOrder app
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Creating a custom Group Activity
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Managing a group activity session
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Testing SharePlay in the ShareOrder app
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Summary
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Chapter 26: Testing and Submitting Your App to the App Store
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Chapter 26: Testing and Submitting Your App to the App Store
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Technical requirements
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Getting an Apple Developer account
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Exploring your Apple Developer account
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Submitting your app to the App Store
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Testing your app
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Summary
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Why subscribe?
31
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Other Books You May Enjoy
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Improving efficiency using async-let

Even though your app is now responsive to button taps and is able to update the user interface while the makeToast() and poachEgg() methods are running, both methods still execute sequentially. The solution here is to use async-let. Writing async in front of a let statement when you define a constant, and then writing await when you access the constant, allows parallel execution of asynchronous methods:

async let temporaryConstant1 = methodName1()
async let temporaryConstant2 = methodName2()
await variable1 = temporaryConstant1
await variable2 = temporaryConstant1

Here, methodName1() and methodName2() will run in parallel.

You will modify your app to use async-let to enable the makeToast() and poachEgg() methods run in parallel. In the ViewController file, modify the code in the Task block as follows:

Task {
   let startTime = Date().timeIntervalSince1970
   toastLabel.text = "Making toast..."...

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