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iOS 17 Programming for Beginners

iOS 17 Programming for Beginners

By : Ian Lockett, Ahmad Sahar
4.6 (21)
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iOS 17 Programming for Beginners

iOS 17 Programming for Beginners

4.6 (21)
By: Ian Lockett, Ahmad Sahar

Overview of this book

In a world with nearly 2 million apps on the App Store, the demand for skilled iOS developers has never been higher. "iOS 17 Programming for Beginners, Eighth Edition" is your gateway to this lucrative and dynamic field. This hands-on guide is tailored for those who are new to iOS and takes you on a journey from learning the Swift language to crafting your own app and seeing it thrive on the App Store. Our approach is hands-on and practical. Each chapter is designed to be a stepping stone in your development journey, providing step-by-step tutorials, real-life examples, and clear explanations of complex concepts. As you progress, you'll not only be skilled in Swift but also incorporate cutting-edge technologies into your apps. You'll learn how to publish your creations and harness the power of iOS 17 through a straightforward and easy to program example app divided into manageable parts. By the time you've completed this book, you'll possess the skills and knowledge to not only develop and publish captivating apps but also leverage online resources to continually enhance your app development prowess.
Table of Contents (34 chapters)
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1
Part 1: Swift
11
Part 2: Design
16
Part 3: Code
26
Part 4: Features
32
Other Books You May Enjoy
33
Index

Improving efficiency using async-let

Even though your app is now responsive to button taps and can 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, as shown here:

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

In this example, methodName1() and methodName2() will run in parallel.

You will modify your app to use async-let to enable the makeToast() and poachEgg() methods to 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...&quot...

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