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SwiftUI Essentials – iOS 14 Edition

You're reading from   SwiftUI Essentials – iOS 14 Edition Developing iOS Apps Using SwiftUI, Swift 5, and Xcode 12

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Product type Paperback
Published in May 2021
Publisher Packt
ISBN-13 9781801813228
Length 494 pages
Edition 1st Edition
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Author (1):
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Neil Smyth Neil Smyth
Author Profile Icon Neil Smyth
Neil Smyth
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Table of Contents (56) Chapters Close

1. Start Here 2. Joining the Apple Developer Program FREE CHAPTER 3. Installing Xcode 12 and the iOS 14 SDK 4. An Introduction to Xcode 12 Playgrounds 5. Swift Data Types, Constants and Variables 6. Swift Operators and Expressions 7. Swift Control Flow 8. The Swift Switch Statement 9. Swift Functions, Methods and Closures 10. The Basics of Swift Object-Oriented Programming 11. An Introduction to Swift Subclassing and Extensions 12. An Introduction to Swift Structures and Enumerations 13. An Introduction to Swift Property Wrappers 14. Working with Array and Dictionary Collections in Swift 15. Understanding Error Handling in Swift 5 16. An Overview of SwiftUI 17. Using Xcode in SwiftUI Mode 18. SwiftUI Architecture 19. The Anatomy of a Basic SwiftUI Project 20. Creating Custom Views with SwiftUI 21. SwiftUI Stacks and Frames 22. SwiftUI State Properties, Observable, State and Environment Objects 23. A SwiftUI Example Tutorial 24. SwiftUI Lifecycle Event Modifiers 25. SwiftUI Observable and Environment Objects – A Tutorial 26. SwiftUI Data Persistence using AppStorage and SceneStorage 27. SwiftUI Stack Alignment and Alignment Guides 28. SwiftUI Lists and Navigation 29. A SwiftUI List and Navigation Tutorial 30. An Overview of List, OutlineGroup and DisclosureGroup 31. A SwiftUI List, OutlineGroup and DisclosureGroup Tutorial 32. Building SwiftUI Grids with LazyVGrid and LazyHGrid 33. Building Tabbed and Paged Views in SwiftUI 34. Building Context Menus in SwiftUI 35. Basic SwiftUI Graphics Drawing 36. SwiftUI Animation and Transitions 37. Working with Gesture Recognizers in SwiftUI 38. Creating a Customized SwiftUI ProgressView 39. An Overview of SwiftUI DocumentGroup Scenes 40. A SwiftUI DocumentGroup Tutorial 41. An Introduction to SiriKit 42. A SwiftUI SiriKit Messaging Extension Tutorial 43. Customizing the SiriKit Intent User Interface 44. A SwiftUI SiriKit NSUserActivity Tutorial 45. An Overview of Siri Shortcut App Integration 46. A SwiftUI Siri Shortcut Tutorial 47. Building Widgets with SwiftUI and WidgetKit 48. A SwiftUI WidgetKit Tutorial 49. Supporting WidgetKit Size Families 50. A SwiftUI WidgetKit Deep Link Tutorial 51. Adding Configuration Options to a WidgetKit Widget 52. Integrating UIViews with SwiftUI 53. Integrating UIViewControllers with SwiftUI 54. Integrating SwiftUI with UIKit 55. Preparing and Submitting an iOS 14 Application to the App Store Index

14.5 Appending Items to an Array

Items may be added to an array using either the append method or + and += operators. The following, for example, are all valid techniques for appending items to an array:

treeArray.append("Redwood")

treeArray += ["Redwood"]

treeArray += ["Redwood", "Maple", "Birch"]

14.5.1 Inserting and Deleting Array Items

New items may be inserted into an array by specifying the index location of the new item in a call to the array’s insert(at:) method. An insertion preserves all existing elements in the array, essentially moving them to the right to accommodate the newly inserted item:

treeArray.insert("Maple", at: 0)

Similarly, an item at a specific array index position may be removed using the remove(at:) method call:

treeArray.remove(at: 2)

To remove the last item in an array, simply make a call to the array’s removeLast method as follows:

treeArray.removeLast...

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