book

An iOS Developer's Guide to SwiftUI

by Michele Fadda

May 2024

Beginner to intermediate

446 pages

10h 33m

English

Packt Publishing

Read now

Unlock full access

ContributorsAbout the authorAbout the reviewer
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesConventions usedGet in touchShare Your ThoughtsDownload a free PDF copy of this book
Technical requirementsExploring SwiftUI with XcodeA brief tour of XcodeYour first SwiftUI projectCreating a SwiftUI projectCreating a multi-platform projectPreviews and the simulatorPlaygroundsThe app submission processCertificatesMobile provisioning profilesThe application submission processSummary
Technical requirementsReusing views codeMore about TextManaging space in SwiftUIThe padding modifierThe .frame modifierThe .alignment modifierThe SpacerThe DividerDigging deeper into stacksOverview of stacksHStackZStackSummary
Technical requirementsPassing values at view creationResponding to a button tapProperty wrappersLimitations of @StateChanging a view appearance dynamically using modifiersBidirectional binding with PickerFinal notes on Subviews and @Binding, Classes, and @ObservableObjectSummary
Technical requirementsIterating viewsHiding or showing the keyboard in a form using @FocusStateScroll viewsControlling scrolling programmatically using ScrollViewReaderSummary
Technical requirementsDisplaying grids in iOSThe Grid viewCreating a simple static gridLazy gridsUsing GridItem to control the layout of LazyVGridScrolling horizontally and sizing the grid automaticallyConditional formatting of a viewReacting to device rotationSummary

Technical requirementsCreating a standard tab barCreating custom tab barsAdapting your code to different versions of the operating systemThe hitchhiker’s guide to modal navigationShowing a modal sheetShowing alertsThe popoverPresentation detentsSummary
Technical requirementsNavigation as a concept in iOS and other platformsShowing a tab bar title with NavigationViewPresenting views with NavigationLink (pre-iOS 16)Adding buttons to NavigationView and activating navigation programmaticallyUsing navigationDestination with NavigationStackUsing NavigationPath to control the navigation stackNavigationSplitView – multicolumn navigationDirect navigation stack manipulation with NavigationPathSaving and loading the navigation stackSummary
Technical requirementsCreating custom modifiersDrawing with the CanvasUsing CALayers in SwiftUICustom layoutSummary
Technical requirementsGesturesBasic gesturesCreating implicit animationsExplicit SwiftUI animationsTransitionsThe .transition() modifierThe matchedGeometryEffect modifierSummary
DiagramsDependency inversionClean ArchitectureDifferent ways to decoupleInitializer injectionMethod injectionProperty injectionA matter of stateiOS 17 changes in state managementOther ways to chop your codeSummary
Keeping it light enoughConflict and the role of the architectWhat good software architecture is and what it is notDon’t be shy; ask an expert!The origin of software patternsAgency theory and bad architectureClean ArchitectureTCA, The Composable ArchitectureSummary
What is persistency?What is Core Data?Understanding Core Data framework classesUsing Core Data with SwiftUICreating a Core Data projectWorking with the data model fileCore Data migrationsThe SQLite data fileCloudKitSummary
A brief introduction to concurrencyUnderstanding traditional concurrency mechanismsThreadsCallbacks and event loopsGCDWhat is structured concurrency?Using the async/await syntaxUnderstanding tasksTask groupsAsynchronous streamsActorsMainActorBridging old GCD and structured concurrencySummary
Technical requirementsUnderstanding the differences between SwiftData and Core DataSwiftData and SwiftUIExploring changes in the binding mechanismsCreating a data modelUnderstanding relationships in SwiftDataOne-to-one relationshipsOne-to-many relationshipsMany-to-one relationshipsMany-to-many relationshipsCascading deletion rulesFetching dataFiltering data with predicatesSummary
Technical requirementsAn overview of RESTPortsUnderstanding REST requests in SwiftCodable, Encodable, and Decodable protocolsUsing URLSessionImplementing HTTP methodsSetting headersHandling errorsURLProtocolSummary
Technical requirementsTools for visionOS developmentAn overview of Unity and RealityKitFirst steps with visionOS developmentSummary
Other Books You May EnjoyPackt is searching for authors like youShare Your ThoughtsDownload a free PDF copy of this book

Content preview from An iOS Developer's Guide to SwiftUI

12 Persistence with Core Data

In this chapter, I will introduce Core Data in SwiftUI. Core Data is a persistency framework for Apple systems. We will also briefly talk about persistence from a more general perspective. As Core Data was introduced in 2003 and has constantly evolved since then, it is not possible to completely cover this topic; it would require a large book just by itself. This chapter will be just an introduction to this persistence framework.

In this chapter, we will define persistency, and then we will move on to explain what Core Data is and how it is structured. We will then explain how to use Core Data within SwiftUI and offer guidance on the practical use of Core Data in Xcode. Finally, we will discuss CloudKit, a framework ...