This document provides an overview of major features in iOS 8, including updates to alert controllers, navigation controllers, notifications, popovers, search controllers, split view controllers, visual effects, collection views, the document picker, HealthKit, Core Image, Scene Kit, and Photo Kit. Key changes are described for each feature through code examples.

1. iOS 8 Overview
@mikebluestein
September 11, 2014

2. Agenda
▪ Alert Controller
▪ Navigation Controller
▪ Notification Settings
▪ Notification Actions
▪ Popover Presentation
Controller
▪ Search Controller
▪ Split View Controller
▪ Visual Effects
▪ Collection Views
▪ Document Picker
▪ Health Kit
▪ Core Image
▪ Scene Kit
▪ Photo Kit

3. Alert
Controller
▪ UIAlertViewController
▪Replaces UIActionSheet and
UIAlertView
iOS 8 Major Features

4. Alert Controller

5. Alert Controller
public static UIAlertController PresentOKAlert(
string title,
string description,
UIViewController controller) {
// No, inform the user that they must create a home first
var alert = UIAlertController.Create (title,
! description, UIAlertControllerStyle.Alert); // Configure the alert
alert.AddAction(UIAlertAction.Create (“OK",
! UIAlertActionStyle.Default,(action) => {})); // Display the alert
! controller.PresentViewController (alert, true, null); // Return created controller
return alert;
}! .!.. // Display the Alert
AlertView.PresentOKAlert ("OK Alert”,
"This is a sample alert with an OK button.”, this);

6. Navigation
Controller
▪Change navigation bar size
▪ Hide navigation bar with gestures
iOS 8 Major Features

7. Navigation Controller
public override void ViewWillAppear (bool animated)
{
! base.ViewWillAppear (animated);
// Set the default mode
! NavigationController.HidesBarsOnTap = true;
// Wireup segment controller
NavBarMode.ValueChanged += (sender, e) => {
// Take action based on the selected mode
switch(NavBarMode.SelectedSegment) {
case 0:
NavigationController.HidesBarsOnTap = true;
NavigationController.HidesBarsOnSwipe = false;
break;
case 1:
NavigationController.HidesBarsOnTap = false;
NavigationController.HidesBarsOnSwipe = true;
break;
}
};
}

8. Notification
Settings
▪ UIUserNotificationSetting
▪ Encapsulates notification types
▪ UIUserNotifiationType – Alert, Badge,
Sound
iOS 8 Major Features

9. Notification Settings
// Set the requested notification types
UIUserNotificationType type =
! UIUserNotificationType.Alert | UIUserNotificationType.Badge;
// Create the setting for the given types
UIUserNotificationSettings settings =
! UIUserNotificationSettings.GetSettingsForTypes(type, categories);
// Register the settings
UIApplication.SharedApplication.RegisterUserNotificationSettings (
settings);

10. Notification
Actions
▪ UIMutableUserNotificationAction
▪ Custom action in response
to notification
iOS 8 Major Features

11. Notification Actions
var acceptAction = new UIMutableUserNotificationAction {
Identifier = "ACCEPT_ID",
Title = "Accept",
ActivationMode = UIUserNotificationActivationMode.Background,
Destructive = false,
AuthenticationRequired = false
}!;
var trashAction = new UIMutableUserNotificationAction {
Identifier = "TRASH_ID",
Title = "Trash",
ActivationMode = UIUserNotificationActivationMode.Background,
Destructive = true,
AuthenticationRequired = true
};

12. Popover
Presentation
Controller
▪ UIPopoverPresentationController
▪ Manages popover content
▪Modal view on iPhone
iOS 8 Major Features

13. Popover Presentation Controller
vc.ModalPresentationStyle =
! UIModalPresentationStyle.Popover;
.!..
P!resentViewController(vc, true, null);
UIPopoverPresentationController popoverController =
! vc.PopoverPresentationController;
if (popoverController!=null) {
popoverController.SourceView = View;
popoverController.PermittedArrowDirections =
UIPopoverArrowDirection.Up;
popoverController.SourceRect = ShowButton.Frame;
}

14. Search
Controller
▪ UISearchController
▪ Replaces UISearchDisplayController
▪ UISearchResultsUpdating updates results
▪ Results can be displayed in any view
as needed
iOS 8 Major Features

15. Search Controller
// Create search updater
var searchUpdater = new SearchResultsUpdator ();
searchUpdater.UpdateSearchResults += (searchText) => {
// Perform search and reload search table
searchSource.Search(searchText);
searchResultsController.TableView.ReloadData();
}!;
// Create a search controller
SearchController = new UISearchController (searchResultsController);
S!earchController.SearchResultsUpdater = searchUpdater;
.!..
public class SearchResultsUpdator : UISearchResultsUpdating
{
public override void UpdateSearchResultsForSearchController (UISearchController
searchController)
{
// Inform caller of the update event
RaiseUpdateSearchResults (searchController.SearchBar.Text);
}
...
}

16. Split View
Controller
▪ UISplitViewController
▪ Now works on iPad and iPhone
▪ PreferredDisplayMode
• AllVisible, PrimaryHidden, PrimaryOverlay
iOS 8 Major Features

17. Split View Features
public class Controller : UISplitViewController
{
public override void ViewDidLoad ()
{
! base.ViewDidLoad ();
PreferredDisplayMode =
UISplitViewControllerDisplayMode.AllVisible;
}
}

18. Visual Effects ▪ UIVisualEffect
▪ Blur and Vibrancy
• UIVibrancyEffect
• UIBlurEffect
iOS 8 Major Features

19. Visual Effects
// blur view
var blur = UIBlurEffect.FromStyle (UIBlurEffectStyle.Light);
var blurView = new UIVisualEffectView (blur) {
Frame = new RectangleF (0, 0, imageView.Frame.Width, 400)
}!;
V!iew.Add (blurView);
// vibrancy view
var frame = new Rectangle (10, 10, 100, 50);
var vibrancy = UIVibrancyEffect.FromBlurEffect (blur);
var vibrancyView = new UIVisualEffectView (vibrancy) {
Frame = frame
}!;
vibrancyView.ContentView.Add (label);
blurView.ContentView.Add (vibrancyView);

20. Collection
Views
▪ Self-sizing cells
▪ UICollectionViewFlowLayout
• EstimatedItemSize
▪ UICollectionViewDelegateFlowLayout
• SizeThatFits
iOS 8 Major Features

21. Collection Views
flowLayout = new UICollectionViewFlowLayout (){
EstimatedItemSize = new SizeF (44, 144)
}!;
.!..
public override SizeF SizeThatFits (SizeF size)
{
label.Frame = new RectangleF (new PointF (0, 0),
label.AttributedText.Size);
return label.AttributedText.Size;
}

22. Document
Picker
▪ UIDocumentPickerController
▪ Select documents outside app sandbox
▪ User can open and documents directly
iOS 8 Major Features

23. Document Picker
!
var allowedUTIs = new string[] {
UTType.PDF, UTType.Image, ...
}!;
var pickerMenu = new UIDocumentMenuViewController(allowedUTIs,
! UIDocumentPickerMode.Open);
p!ickerMenu.DidPickDocumentPicker += (sender, args) => {
! args.DocumentPicker.DidPickDocument += (s, pArgs) => {
var securityEnabled =
! pArgs.Url.StartAccessingSecurityScopedResource();
! ThisApp.OpenDocument(pArgs.Url);
pArgs.Url.StopAccessingSecurityScopedResource();
! };
// Display the document picker
PresentViewController (args.DocumentPicker, true, null);
};

24. Health
Kit
▪ Store and Share Health Data
▪ Create Data
▪ Save Data
▪ Query Data
iOS 8 Major Features

25. Health Kit Classes
▪ HKUnit
• represents a unit of measure
▪ HKQuantity
• double value relative to a unit
• can be used for conversion
▪ HKObjectType
• represent different kinds of
data that can be stored
▪ HKObject
• All data stored is a subclass of
HKObject

26. Health Store
▪ HKHealthStore - link to the health database
▪ Check Health Kit availability on device
▪ Authorize Health Kit
▪ Save and Query data
▪ Query via HKQuery

27. Authorize
// authorization
if (HKHealthStore.IsHealthDataAvailable) {
var temperatureKey =
HKQuantityTypeIdentifierKey.BodyTemperature;
var tempQuantityType =
HKObjectType.GetQuantityType ! (temperatureKey);
! var healthStore = new HKHealthStore ();
healthStore.RequestAuthorizationToShare (
new NSSet (new [] { tempQuantityType }),
! new NSSet (), (success, error) => {
});
}

28. Save
// save data
var temp = HKQuantity.FromQuantity (
HKUnit.DegreeFahrenheit, ! 99.9);
var meta = NSDictionary.FromObjectAndKey (
new NSNumber (4),
! HKMetadataKey.BodyTemperatureSensorLocation);
var sample = HKQuantitySample.FromType (
tempQuantityType,
temp,
new NSDate (),
new NSDate (),
! meta);
healthStore.SaveObject (sample, (success, err) => { ... });

29. Query
// query data
var temperatureType =
HKObjectType.GetQuantityType (HKQuantityTypeIdentifierKey.BodyTemperature) ! as HKSampleType;
//Sort descending, by end date (i.e., last sample)
var sortDescriptor = new NSSortDescriptor (HKSample.SortIdentifierEndDate, false);
n!ew HKSampleQuery (temperatureType, null, 1, new [] { sortDescriptor }, ResultsHandler);
protected void ResultsHandler (HKSampleQuery query, HKSample[] results, NSError error)
{
...
}

30. Core Image
▪ New QR code and Rectangle detectors
▪ New Filters
▪ Custom Filters
▪ Feature detection in video
iOS 8 Major Features

31. Core Image Detectors
▪ Previously only facial detection
▪ Now Rectangle and QR code detectors
▪ CIDetector.CreateRectangleDetector
▪ CIDetector.CreateQRDetector

32. Save
var context = CIContext.FromOptions (null);
var options = new CIDetectorOptions {
Accuracy = FaceDetectorAccuracy.High
}!;
var detector = CIDetector.CreateRectangleDetector (context, options);
var ciImage = CIImage.FromCGImage (imageIn.CGImage);
v!ar features = detector.FeaturesInImage (ciImage);
v!ar overlay = CIImage.ImageWithColor (CIColor.FromRgba (1.0f, 0.0f, 0.0f, 0.7f));
overlay = overlay.ImageByCroppingToRect (features [0].Bounds);
var ciImageWithOverlay = overlay.CreateByCompositingOverImage (ciImage);

33. Scene
Kit
▪ 3D Scene Graph
▪ Casual 3D Games
▪ 3D Visualizations
▪ Abstracts OpenGL ES
iOS 8 Major Features

34. Scene Kit

35. Scene Kit
// scene
scene = SCNScene.Create ();
sceneView = new SCNView (View.Frame);
s!ceneView.Scene = scene; sphere = SCNSphere.Create (10.0f);
sphereNode = SCNNode.FromGeometry (sphere);
sphereNode.Position = new SCNVector3 (0, 0, 0);
s!cene.RootNode.AddChildNode (sphereNode); // omni-directional light
var light = SCNLight.Create ();
var lightNode = SCNNode.Create ();
light.LightType = SCNLightType.Omni;
light.Color = UIColor.Blue;
lightNode.Light = light;
lightNode.Position = new SCNVector3 (-40, 40, 60);
scene.RootNode.AddChildNode (lightNode);
// ambient light
ambientLight = SCNLight.Create ();
ambientLightNode = SCNNode.Create ();
ambientLight.LightType = SCNLightType.Ambient;
ambientLight.Color = UIColor.Purple;
ambientLightNode.Light = ambientLight;
s!cene.RootNode.AddChildNode (ambientLightNode);
// camera
camera = new SCNCamera {
XFov = 80,
YFov = 80
};
cameraNode = new SCNNode {
Camera = camera,
Position = new SCNVector3 (0, 0, 40)
};
scene.RootNode.AddChildNode (cameraNode)

36. Photo
Kit
▪ Framework to work with
photo and video assets
▪ Fetch Results -
PHAsset.FetchAssets
▪ Write Changes -
PhotoLibraryObserver
iOS 8 Major Features

37. DEMO

38. Much More
▪ Manual Camera Controls
▪ Home Kit
▪ Cloud Kit
▪ Handoff
▪ Touch ID Auth
▪ App Extensions
▪ Unified Storyboards
▪ Sprite Kit
▪ Metal
▪ Apple Pay

39. Much More
http://developer.xamarin.com/guides/ios/platform_features/introduction_to_ios_8/

40. Key Attendees