book

Programming iOS 12

by Matt Neuburg

October 2018

Beginner

1176 pages

32h 37m

English

O'Reilly Media, Inc.

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The Scope of This BookVersionsAcknowledgmentsFrom the Programming iOS 4 PrefaceConventions Used in This BookUsing Code ExamplesO’Reilly SafariHow to Contact Us
The Window and Root ViewHow an App LaunchesSubclassing UIWindowReferring to the WindowExperimenting with ViewsSubview and SuperviewVisibility and OpacityFrameBounds and CenterTransformThe View EnvironmentWindow Coordinates and Screen CoordinatesTrait Collections and Size ClassesLayoutAutoresizingAutolayout and ConstraintsImplicit Autoresizing ConstraintsCreating Constraints in CodeConstraints as ObjectsMargins and GuidesIntrinsic Content Size and Alignment RectsStack ViewsInternationalizationMistakes with ConstraintsConfiguring Layout in the NibAutoresizing in the NibCreating a ConstraintViewing and Editing ConstraintsProblems with Nib ConstraintsVarying the Screen SizeConditional Interface DesignXcode View FeaturesView DebuggerPreviewing Your InterfaceDesignable Views and Inspectable PropertiesLayout EventsLayout-Driven UITweaking AutolayoutSimulating Autolayout
Images and Image ViewsImage FilesImage ViewsResizable ImagesTransparency MasksReversible ImagesGraphics ContextsDrawing On DemandDrawing a UIImageUIImage DrawingCGImage DrawingSnapshotsCIFilter and CIImageBlur and Vibrancy ViewsDrawing a UIViewGraphics Context CommandsGraphics Context SettingsPaths and ShapesClippingGradientsColors and PatternsGraphics Context TransformsShadowsErasingPoints and PixelsContent Mode
View and LayerLayers and SublayersManipulating the Layer HierarchyPositioning a SublayerCAScrollLayerLayer and DelegateLayout of LayersDrawing in a LayerDrawing-Related Layer PropertiesContent Resizing and PositioningLayers that Draw ThemselvesTransformsAffine Transforms3D TransformsDepthFurther Layer FeaturesShadowsBorders and Rounded CornersMasksLayer EfficiencyLayers and Key–Value Coding
Drawing, Animation, and ThreadingImage View and Image AnimationView AnimationA Brief History of View AnimationProperty Animator BasicsView Animation BasicsView Animation ConfigurationTiming CurvesCanceling a View AnimationFrozen View AnimationCustom Animatable View PropertiesKeyframe View AnimationTransitionsImplicit Layer AnimationAnimation TransactionsMedia Timing FunctionsCore AnimationCABasicAnimation and Its InheritanceUsing a CABasicAnimationSpringing AnimationKeyframe AnimationMaking a Property AnimatableGrouped AnimationsFreezing an AnimationTransitionsAnimations ListActionsWhat an Action IsAction SearchHooking Into the Action SearchMaking a Custom Property Implicitly AnimatableNonproperty ActionsEmitter LayersCIFilter TransitionsUIKit DynamicsThe Dynamics StackCustom BehaviorsAnimator and BehaviorsMotion EffectsAnimation and Layout
Touch Events and ViewsReceiving TouchesRestricting TouchesInterpreting TouchesGesture RecognizersGesture Recognizer ClassesGesture Recognizer ConflictsSubclassing Gesture RecognizersGesture Recognizer DelegateGesture Recognizers in the Nib3D Touch Press GestureTouch DeliveryHit-TestingPerforming Hit-TestingHit-Test MungingHit-Testing For LayersHit-Testing For DrawingsHit-Testing During AnimationInitial Touch Event DeliveryGesture Recognizer and ViewTouch Exclusion LogicGesture Recognition Logic
View Controller ResponsibilitiesView Controller HierarchyAutomatic Child View PlacementManual Child View PlacementPresentation View PlacementEnsuring a Coherent HierarchyView Controller CreationHow a View Controller Obtains Its ViewManual ViewGeneric Automatic ViewView in a Separate NibSummaryHow Storyboards WorkHow a View Controller Nib is LoadedHow a View Nib is LoadedView ResizingView Size in the Nib EditorBars and UnderlappingResizing and Layout EventsRotationDetecting RotationUses of RotationPermitting Compensatory RotationInitial OrientationView Controller Manual LayoutInitial Manual LayoutManual Layout During RotationPresented View ControllerPresentation and DismissalConfiguring a PresentationCommunication with a Presented View ControllerAdaptive PresentationPresentation, Rotation, and the Status BarTab Bar ControllerTab Bar ItemsConfiguring a Tab Bar ControllerNavigation ControllerBar Button ItemsNavigation Items and Toolbar ItemsConfiguring a Navigation ControllerCustom TransitionNoninteractive Custom Transition AnimationInteractive Custom Transition AnimationCustom Presented View Controller TransitionTransition CoordinatorPage View ControllerPreparing a Page View ControllerPage View Controller NavigationOther Page View Controller ConfigurationsContainer View ControllersAdding and Removing ChildrenStatus Bar, Traits, and ResizingPeek and PopStoryboardsTriggered SeguesContainer Views and Embed SeguesStoryboard ReferencesUnwind SeguesView Controller Lifetime EventsOrder of EventsAppear and Disappear EventsEvent Forwarding to a Child View ControllerView Controller Memory ManagementLazy LoadingNSCache, NSPurgeableData, and Memory-MappingBackground Memory UsageState RestorationHow to Test State RestorationParticipating in State RestorationRestoration ID, Identifier Path, and Restoration ClassRestoring View Controller StateRestoration Order of OperationsRestoration of Other Objects
Content SizeCreating a Scroll View in CodeManual Content SizeAutomatic Content Size with AutolayoutScroll View Layout GuidesUsing a Content ViewScroll View in a NibNo Internal AutolayoutInternal AutolayoutContent InsetScrollingScrolling in CodePagingTilingZoomingZooming ProgrammaticallyZooming with DetailScroll View DelegateScroll View TouchesFloating Scroll View SubviewsScroll View Performance

Table View ControllerTable View CellsBuilt-In Cell StylesRegistering a Cell ClassCustom CellsTable View DataThe Three Big QuestionsReusing CellsTable View SectionsSection Headers and FootersSection IndexRefreshing a Table ViewDirect Access to CellsRefresh ControlVariable Row HeightsManual Row Height MeasurementMeasurement and Layout with ConstraintsEstimated HeightAutomatic Row HeightTable View SelectionManaging Cell SelectionResponding to Cell SelectionNavigation from a Table ViewCell Choice and Static TablesTable View Scrolling and LayoutTable View State RestorationTable View SearchingConfiguring a Search ControllerUsing a Search ControllerTable View EditingToggling a Table View’s Edit ModeChanging a Table View’s StructureDeleting CellsCustom Action ButtonsEditable Content in CellsInserting CellsRearranging CellsCollapsing and Expanding CellsTable View MenusCollection ViewsCollection View ClassesUsing a Collection ViewDeleting CellsRearranging CellsCustom Collection View LayoutsFlow Layout SubclassCollection View Layout SubclassDecoration ViewsSwitching LayoutsCollection Views and UIKit Dynamics
PopoversArrow Source and DirectionPopover SizePopover AppearancePassthrough ViewsPopover Presentation, Dismissal, and DelegateAdaptive PopoversPopover SeguesPopover Presenting a View ControllerSplit ViewsExpanded Split View Controller (iPad)Collapsed Split View Controller (iPhone)Expanding Split View Controller (Big iPhone)Customizing a Split View ControllerSplit View Controller in a StoryboardSetting the Collapsed StateView Controller Message PercolationiPad MultitaskingDrag and DropDrag and Drop ArchitectureBasic Drag and DropItem ProvidersSlow Data DeliveryAdditional Delegate MethodsTable Views and Collection ViewsSpring LoadingiPhone and Local Drag and Drop
Fonts and Font DescriptorsFontsFont DescriptorsAttributed StringsAttributed String AttributesMaking an Attributed StringModifying and Querying an Attributed StringCustom AttributesDrawing and Measuring an Attributed StringLabelsNumber of LinesWrapping and TruncationResizing a Label to Fit Its TextCustomized Label DrawingText FieldsSummoning and Dismissing the KeyboardKeyboard Covers Text FieldText Field Delegate and Control Event MessagesText Field MenuDrag and DropKeyboard and Input ConfigurationText ViewsLinks, Text Attachments, and DataSelf-Sizing Text ViewText View and KeyboardText KitText View and Text KitText ContainerAlternative Text Kit Stack ArchitecturesLayout ManagerText Kit Without a Text View
WKWebViewWeb View ContentTracking Changes in a Web ViewWeb View NavigationCommunicating with a Web PageCustom SchemesWeb View Peek and PopSafari View ControllerDeveloping Web View Content
UIActivityIndicatorViewUIProgressViewProgress View AlternativesThe Progress ClassUIPickerViewUISearchBarUIControlUISwitchUIStepperUIPageControlUIDatePickerUISliderUISegmentedControlUIButtonCustom ControlsBarsBar Position and Bar MetricsBar AppearanceUIBarButtonItemUINavigationBarUIToolbarUITabBarTint ColorAppearance Proxy
Alerts and Action SheetsAlertsAction SheetsDialog AlternativesQuick ActionsLocal NotificationsAuthorization for Local NotificationsNotification CategoriesScheduling a Local NotificationHearing About a Local NotificationGrouped NotificationsManaging NotificationsNotification Content ExtensionsToday ExtensionsActivity ViewsPresenting an Activity ViewCustom ActivitiesAction ExtensionsShare Extensions
System SoundsAudio SessionCategoryActivation and DeactivationDuckingInterruptionsSecondary AudioRouting ChangesAudio PlayerRemote Control of Your SoundPlaying Sound in the BackgroundAVAudioEngineMIDI PlaybackText to SpeechSpeech to TextFurther Topics in Sound
AVPlayerViewControllerOther AVPlayerViewController PropertiesPicture-in-PictureIntroducing AV FoundationSome AV Foundation ClassesThings Take TimeTime is Measured OddlyConstructing MediaAVPlayerLayerFurther Exploration of AV FoundationUIVideoEditorController
Music Library AuthorizationExploring the Music LibraryQuerying the Music LibraryPersistence and Change in the Music LibraryMusic PlayerMPVolumeViewPlaying Songs with AV FoundationMedia Picker
Browsing with UIImagePickerControllerImage Picker Controller PresentationImage Picker Controller DelegateDealing with Image Picker Controller ResultsPhotos FrameworkQuerying the Photo LibraryModifying the LibraryBeing Notified of ChangesFetching ImagesEditing ImagesPhoto Editing ExtensionUsing the CameraCapture with UIImagePickerControllerCapture with AV Foundation
Contact ClassesFetching Contact InformationFetching a ContactRepopulating a ContactLabeled ValuesContact FormattersSaving Contact InformationContact Sorting, Groups, and ContainersContacts InterfaceCNContactPickerViewControllerCNContactViewController
Calendar Database ContentsCalendarsCalendar ItemsCalendar Database ChangesCreating Calendars, Events, and RemindersEventsAlarmsRecurrenceRemindersProximity AlarmsFetching Events and RemindersCalendar InterfaceEKEventViewControllerEKEventEditViewControllerEKCalendarChooser
Displaying a MapAnnotationsCustomizing an MKMarkerAnnotationViewChanging the Annotation View ClassCustom Annotation View ClassCustom Annotation ClassAnnotation View Hiding and ClusteringOther Annotation FeaturesOverlaysCustom Overlay ClassCustom Overlay RendererOther Overlay FeaturesMap Kit and Current LocationCommunicating with the Maps AppGeocoding, Searching, and DirectionsGeocodingSearchingDirections
Core LocationLocation Manager, Delegate, and AuthorizationLocation TrackingWhere Am I?Background LocationHeadingAcceleration, Attitude, and ActivityShake EventsUsing Core MotionRaw AccelerationGyroscopeOther Core Motion Data
The SandboxStandard DirectoriesInspecting the SandboxBasic File OperationsSaving and Reading FilesUser DefaultsSimple Sharing and Previewing of FilesFile SharingDocument Types and Receiving a DocumentHanding Over a DocumentPreviewing a DocumentQuick Look PreviewsDocument ArchitectureA Basic Document ExampleiCloudDocument BrowserCustom ThumbnailsCustom PreviewsDocument PickerXMLJSONSQLiteCore DataPDFsImage Files
HTTP RequestsObtaining a SessionSession ConfigurationSession TasksSession DelegateHTTP Request with Task Completion FunctionHTTP Request with Session DelegateOne Session, One DelegateDelegate Memory ManagementSession and Delegate EncapsulationDownloading Table View DataBackground SessionOn-Demand ResourcesIn-App Purchases
Main ThreadBackground ThreadsWhy Threading Is HardBlocking the Main ThreadManual ThreadingOperationGrand Central DispatchCommonly Used GCD MethodsSynchronous ExecutionDispatch GroupsOne-time ExecutionConcurrent QueuesChecking the QueueThreads and App Backgrounding
Target–Action UndoUndo GroupingFunctional UndoUndo InterfaceShake-To-EditUndo Menu
Application StatesApp Delegate EventsApp Lifetime ScenariosMajor State ChangesPaused InactivityTransient Inactivity on the iPadLifetime Event Timing
Launch Without Main StoryboardCore Graphics InitializersCenter of a CGRectAdjust a CGSizeDelayed PerformanceDictionary of ViewsConstraint Priority ArithmeticConstraint IssuesConfigure a Value Class at Point of UseFinite Repetition of an AnimationRemove Multiple Indexes from an Array

Content preview from Programming iOS 12

Chapter 14. Audio

iOS provides various technologies that allow your app to produce, record, and process sound. The topic is a large one, so I’ll concentrate on the basics. You’ll want to read Apple’s Media Playback Programming Guide and Core Audio Overview in the documentation archive. Suggestions for further reading also appear at the end of this chapter.

None of the classes discussed in this chapter provides any transport interface within your app — that is, interface for allowing the user to stop and start playback of sound. If you want transport interface, here are some options:

You can create your own interface.
You can associate the built-in “remote control” buttons with your app, as I’ll explain in this chapter.
A web view (Chapter 11) supports the HTML5 <audio> tag; this can be a simple, lightweight way to play audio and to allow the user to control playback (including use of AirPlay).
You could treat the sound as a movie and use the interface-providing classes that I’ll discuss in Chapter 15; this can also be a good way to play a sound file located remotely over the internet.

System Sounds

The simplest form of sound is system sound, which is the iOS equivalent of the basic computer “beep.” This is implemented through System Sound Services, part of the Audio Toolbox framework; you’ll need to import AudioToolbox. The API for playing a system sound comes in two forms — the old form and the new form (introduced in iOS 9). I’ll show you the old form first (it still ...