Book Image

iOS 14 Programming for Beginners - Fifth Edition

By : Ahmad Sahar
Book Image

iOS 14 Programming for Beginners - Fifth Edition

By: Ahmad Sahar

Overview of this book

If you're looking to work and experiment with powerful iOS 14 features such as widgets and App Clips to create your own apps, this iOS programming guide is for you. The book offers a comprehensive introduction for experienced programmers who are new to iOS, taking you through the entire process of learning the Swift language, writing your own apps, and publishing them on the App Store. Fully updated to cover the new iOS 14 features, along with Xcode 12 and Swift 5.3, this fifth edition of iOS 14 Programming for Beginners starts with an introduction to the Swift programming language and shows you how to accomplish common programming tasks with it. You'll then start building the user interface (UI) of a complete real-world app using the storyboards feature in the latest version of Xcode and implement the code for views, view controllers, data managers, and other aspects of mobile apps. The book will also help you apply iOS 14 features to existing apps and introduce you to SwiftUI, a new way to build apps for all Apple devices. Finally, you’ll set up testers for your app and understand what you need to do to publish your app on the App Store. By the end of this book, you'll not only be well versed in writing and publishing applications, but you’ll also be able to apply your iOS development skills to enhance existing apps.

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Table of Contents (31 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Code in Action
Download the color images
Conventions used
Get in touch
Reviews
1
Section 1: Swift
Section 1: Swift
Free Chapter
2
Chapter 1: Getting Familiar with Xcode
Chapter 1: Getting Familiar with Xcode
Technical requirements
Downloading and installing Xcode from the App Store
Understanding the Xcode user interface
Running the app in the iOS simulator
Using an iOS device for development
Summary
3
Chapter 2: Simple Values and Types
Chapter 2: Simple Values and Types
Technical requirements
Understanding Swift Playgrounds
Exploring data types
Exploring constants and variables
Understanding type inference and type safety
Exploring operators
Using the print() instruction
Summary
4
Chapter 3: Conditionals and Optionals
Chapter 3: Conditionals and Optionals
Technical requirements
Introducing conditionals
Introducing optionals
Summary
5
Chapter 4: Range Operators and Loops
Chapter 4: Range Operators and Loops
Technical requirements
Exploring range operators
Exploring loops
Summary
6
Chapter 5: Collection Types
Chapter 5: Collection Types
Technical requirements
Understanding arrays
Understanding dictionaries
Understanding sets
Summary
7
Chapter 6: Functions and Closures
Chapter 6: Functions and Closures
Technical requirements
Understanding functions
Understanding closures
Summary
8
Chapter 7: Classes, Structures, and Enumerations
Chapter 7: Classes, Structures, and Enumerations
Technical requirements
Understanding classes
Understanding structures
Understanding enumerations
Summary
9
Chapter 8: Protocols, Extensions, and Error Handling
Chapter 8: Protocols, Extensions, and Error Handling
Technical requirements
Understanding protocols
Understanding extensions
Exploring error handling
Summary
10
Section 2:Design
Section 2:Design
11
Chapter 9: Setting Up the User Interface
Chapter 9: Setting Up the User Interface
Technical requirements
Learning useful terms in iOS development
Touring the Let's Eat app
Creating a new Xcode project
Setting up a tab bar controller scene
Setting up the Launch screen
Summary
12
Chapter 10: Building Your User Interface
Chapter 10: Building Your User Interface
Adding a collection view to the Explore screen
Connecting storyboard elements to outlets in a view controller
Configuring data source methods for the collection view
Adding a section header to the collection view
Configuring storyboard element sizes
Presenting a view modally
Summary
13
Chapter 11: Finishing Up Your User Interface
Chapter 11: Finishing Up Your User Interface
Technical requirements
Adding a table view to the Locations screen
Implementing the Restaurant List screen
Implementing the Restaurant Detail screen
Implementing the Map screen
Summary
14
Chapter 12: Modifying and Configuring Cells
Chapter 12: Modifying and Configuring Cells
Technical requirements
Modifying the Explore screen section header
Modifying the exploreCell collection view cell
Modifying the restaurantCell collection view cell
Configuring the locationCell table view cell
Summary
15
Section 3:Code
Section 3:Code
16
Chapter 13: Getting Started with MVC and Collection Views
Chapter 13: Getting Started with MVC and Collection Views
Technical requirements
Understanding the Model-View-Controller design pattern
Exploring controllers and classes
Summary
17
Chapter 14: Getting Data into Collection Views
Chapter 14: Getting Data into Collection Views
Technical requirements
Understanding model objects
Understanding .plist files
Creating a structure to represent a cuisine
Implementing a data manager class to read data from a .plist file
Displaying data in a collection view
Summary
Technical requirements
Understanding table views
Creating the LocationViewController class
Adding location data for the table view
Creating the LocationDataManager class
Summary
18
Chapter 16: Getting Started with MapKit
Chapter 16: Getting Started with MapKit
Technical requirements
Understanding and creating annotations
Adding annotations to a map view
Going from the Map screen to the Restaurant Detail screen
Organizing your code
Summary
19
Chapter 17: Getting Started with JSON Files
Chapter 17: Getting Started with JSON Files
Technical requirements
Getting data from JSON files
Using data from JSON files in your app
Summary
20
Chapter 18: Displaying Data in a Static Table View
Chapter 18: Displaying Data in a Static Table View
Technical requirements
Setting up outlets for the RestaurantDetailViewController class
Displaying data in the static table view
Passing data to the RestaurantDetailViewController instance
Summary
21
Chapter 19: Getting Started with Custom UIControls
Chapter 19: Getting Started with Custom UIControls
Technical requirements
Creating a custom UIControl subclass
Adding support for touch events
Implementing an unwind method for the Cancel button
Creating the ReviewFormViewController class
Summary
22
Chapter 20: Getting Started with Cameras and Photo Libraries
Chapter 20: Getting Started with Cameras and Photo Libraries
Technical requirements
Understanding filters
Creating model objects for the Photo Filter screen
Creating the ImageFiltering protocol
Creating view controllers for the Photo Filter screen
Getting permission to use the camera or photo library
Summary
23
Chapter 21: Understanding Core Data
Chapter 21: Understanding Core Data
Technical requirements
Introducing Core Data
Implementing Core Data components for your app
Understanding how saving and loading works
Updating the PhotoFilterViewController class to save photos
Displaying saved reviews and photos on the Restaurant Detail screen
Calculating a restaurant's overall rating
Summary
24
Section 4:Features
Section 4:Features
25
Chapter 22: Getting Started with Apple Silicon Macs
Chapter 22: Getting Started with Apple Silicon Macs
Technical requirements
Fixing user interface issues
Making your app run on all iOS devices
Updating the app to work on macOS
Summary
26
Chapter 23: Getting Started with SwiftUI
Chapter 23: Getting Started with SwiftUI
Technical requirements
Creating a SwiftUI Xcode Project
Creating the Restaurant List screen
Adding model objects and configuring navigation
Using UIKit and SwiftUI views together
Completing the Restaurant Detail screen
Summary
27
Chapter 24: Getting Started with Widgets
Chapter 24: Getting Started with Widgets
Technical requirements
Introducing widgets
Adding a widget target to your app
Providing timeline entries to your widget
Customizing your widget's view
Adding a widget to your Home Screen
Summary
28
Chapter 25: Getting Started with App Clips
Chapter 25: Getting Started with App Clips
Technical requirements
Introducing app clips
Adding an app clip to your project
Configuring your app clip
Passing restaurant data to the Restaurant Detail screen
Summary
29
Chapter 26: Testing and Submitting Your App to the App Store
Chapter 26: Testing and Submitting Your App to the App Store
Technical requirements
Getting an Apple Developer account
Exploring your Apple Developer account
Submitting your app to the App Store
Testing your app
Summary
30
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Calculating a restaurant's overall rating

The Restaurant Detail screen's overall rating label displays 0.0, and the ratings view displays 3.5 stars, regardless of the actual rating. To add an overall rating, you need to get the ratings from all the reviews and average them. Let's add a new method to CoreDataManager to do this. Follow these steps:

  1. Click CoreDataManager.swift in the Project navigator (inside the Core Data folder in the Misc folder) and add the following method before the addReview(_:) method:
    func fetchRestaurantRating(by identifier:Int) -> Double { 
    let reviews = fetchReviews(by: identifier)
    let sum = reviews.reduce(0, {$0 + ($1.rating ?? 0)}) 
    return sum / Double(reviews.count)
}

    In this method, all reviews for a particular restaurant are fetched from the persistent store and assigned to reviews. The reduce() method takes a closure, which is used to add all the review ratings...

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