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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

Exploring error handling

When you write apps, bear in mind that error conditions may happen, and error handling is how your app would respond to and recover from such conditions.

First, you create a type that conforms to Swift’s Error protocol, which lets this type be used for error handling. Enumerations are normally used, as you can specify associated values for different kinds of errors. When something unexpected happens, you can stop program execution by throwing an error. You use the throw statement for this and provide an instance of the type conforming to the Error protocol with the appropriate value. This allows you to see what went wrong.

Of course, it would be better if you could respond to an error without stopping your program. For this, you can use a do-catch block, which looks like this:

do {
   try expression1
   statement1
} catch {
   statement2
}

Here, you attempt to execute code in the do block using the try keyword. If an error is thrown...

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