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.
Table of Contents (31 chapters)
1
Section 1: Swift
10
Section 2:Design
15
Section 3:Code
24
Section 4:Features

Adding support for touch events

At present, the RestaurantDetailViewController class has an outlet, ratingsView, connected to a ratings view in the Restaurant Detail screen. It displays a rating of three and a half stars, but you can't change the rating. You will need to support touch events to make the ratings view respond to taps.

Important information

You can learn more about handling touches at https://developer.apple.com/documentation/uikit/touches_presses_and_gestures/handling_touches_in_your_view.

To support touch events, you'll modify the RatingsView class to track the user's touches on screen and use them to determine the rating. Follow these steps:

  1. Click RatingsView.swift in the Project navigator and add the following after the draw(_:) method:
    override var canBecomeFirstResponder: Bool{
         return true
    }

    canBecomeFirstResponder is a UIControl property that determines whether an object can become the first responder...