Introduging UIDragInteraction - subclass off UIInteraction
Built-in support for TableView, CollectionView, TextView, TextField, WebView
Multiple sessions this week
UIDocumentBrowserViewController
Other applications may access your files
Use NSFileCoordinator or subclass UIDocument to avoid file access conflicts
Large title with built in Search Bar
prefersLargeTitle property on UINavigationBar
Generally, first view on navigation stack should use large title, subsequent views should use traditional titles
View is part of the navigation bar not the content view, changes size as TableView or CollectionView scrolls
New property on safeAreaInsets property on UIView
This property has a .top and .bottom value
New property on UIScrollView, adjustedContentInset
TableViews have unified swipe actions
Check out UIContextualAction class, seems very nice for TableView editing
New separatorInsetReference property on UITableView allows more consistent placement of cell separators
Check out Design Studio Shorts session
New API for archiving Swift types like Enum and Stuct
New KeyPath type
Updates to KVO with KeyPaths
Block-based KVO
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Notification Center - iOS 5
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Control Center - iOS 7
iOS 11 provides override method that returns UIRectEdge objects you want to protect (aka defer the system gesture)
Adding contentLayoutGuide and frameLayoutGuide to UIScrollView
New class UIFontMetrics that lets you create standard size with a custom font then Dynamic Type system can scale it like a system font
Auto Layout has a new constraintEqualToSystemSpacing method that takes two anchors and tries to work out a good fit based on Dynamic Type changes
NOTE: A lot of Auto Layout code was shown with no storyboards...do these two prefer programatic?
System detects User / Password UI fields and presents a key that launches your iCloud Keychain stored passwords
Add an entitlement to your app then a few lines of JSON
Entire session on Password AutoFill
Colors and icons can be added to Asset Catalogs
App thinning for icons - adopted by default in iOS 11 new projects
PDF-backed images
Tab bar images can re-size with accessibility settings (or a future use case?)
Can ask UIScreen for maximumFramesPerSecond
Key as always is to optimize drawing code using Instruments
- Be responsive
- Secure, more so than pasteboard
- A great multi-touch experience
You can drag links into Safari as a tab
Seems like an impressive implementation but will more casual users want to use this workflow?
NOTE: iOS 11 icons are looking flatter and more minimal than ever, new App Store icon is like empty
- Lift
- Drag
- Set Down
- Data Transfer
UIDragInteraction has a delegate similar to gesture recognizers
UIDragItem is the model object
You can enable a drop using UIPasteConfiguration but UIDropInteraction is the more robust API that has a delegate that returns an intention (not an Android Intent), it can say no thanks or call performDrop
Source application > middle ground where both may have access (plus the OS?) > Destination application
UIKit manages timeline and lifecycle of a drag and drop session
High level flow is:
- Get items to drop
- Get a drop proposal
- Perform the drop
NSItem provider only deals in Objects, so String should be cast to NSString
UIDropOperation has enumerated values of .cancel, copy, .move, .forbidden
NOTE: Look for a Ray Wenderlich or NSHipster tutorial on this. It's a fairly involved API. Get the sample code and mess around with it.
Only one drag interation but could be multiple drop interactions as the drag is hovering over drop target views. There are some cool opportunities for creative UX here as users drag over different types views.
SpringLoading is a thing, something happens when a drag hovers over a spring loaded view?
This is a substantial API with powerful delegates on the level of UITableView or UICollectionView
Demo app shows dragging photos from Photos to pin board app, you can drag around from within that app, cool use cases here
Use .copy for between applications and .move within the same app
Interesting that some of the delegates take a position of type CGPoint, doesn't seem the most Auto Layout friendly?
Exlpre the system
Start simple by adopting drop target
Try the drag source delegates
Spring load a few controls
Refine and iterate for your use case
This is a very powerful new set of features. I don't think they would have invested all this time in designing this system if it didn't have a lot of potential. Will dig deeper in future sessions and after visiting the labs.
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DeviceMotion, a powerful API from watchOS is now available for iPhone 7 and iPhone 7 Plus with iOS 11
Go back and look at 2016 SceneKit demo, get this Badger game
To use DeviceMotion, you create a CMMotionManager object and call startDeviceMotionUpdates() with the appropriate reference frame
Augmented Reality is creating the illusion that virtual objects appear in the physical world
Sneak Peaks at WithIn - Storytelling with AR, Ikea - Virtual furniture shopping, PokemonGo - Better AR UX
ARKit is supported on A9 and up (iPhone 6S and iPhone 6S Plus)
Framework provides tracking, scene understanding, and rendering to simplify the developer experience
There are ARViews for SpriteKit and SceneKit
Unity and Unreal are supporting full set of features from ARKit
ARKit calls AVFoundation and CoreMotion
ARSessionConfiguration lets you create an ARSession, then run it
ARSession produces ARFrames, you can inspect the currentFrame property or sign up as the delegate
ARFrameuses ARAnchor
World Tracking gives you information about position, orientation, scale, physical distance movement - all relative to the starting point of your ARSession
ARCamera is the virtual camera for the 3D scene (not the device camera)
They show how to make a simple hello world ARKit app
SceneKit APIs work very nicely with ARKit
You can add a gesture recognizer to the base app template to do some really cool things like putting a snapshot view on a plane
The framework gives you a cameraDidChangeTrackingState delegate method to let you know when the user is facing a white wall or bad lighting conditions
There are also delegate methods to inform you when tracking was interupted or ended
First step is plane detection, is there a surface available?
Plane detection runs over multiple frames to build full understanding of the world and provide ARPlanAnchors
Hit-testing provides an array of hit-test results in the order of nearest to the camera first
Light Estimation lets you understand relative brightness of the world so you can apply the right lighting to your augmentation
Debug mode shows you plane detection in real time, pretty impressive
Real world scaling is enabled by real world tracking and the model itself being created using real world coordinates
The ARKitExample demo app is one of the most insane things I have ever seen
There is an ARSCNViewDelegate that provides more seamless integration with SceneKit
You also get an ARSKView which maps SKNodes to ARAnchors
Sprites are treated like billboards in ARKit, meaning they always face the camera