Get ready for iOS 8 with this introduction from Xamarin Evangelist Mike Bluestein.

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