Don't use reloadData, use performBatchUpdates to avoid losing the placeholder cells
Placeholder cells come with a built in progress loading UI, can this be overriden?
Use a drop proposal with type of .move
Table View will call performDropWith behind the scenes
Collection View requires you to provide a dragDelegate and dropDelegate
Collection View now allows for a reorderingCadence of: .immediate (the current reordering behavior) .fast (ironically named - provides a fast movement but delayed cell movement until you stop dragging) .slow (similar to iOS SpringBoard home screen reordering)
This works by default for Table View and Collection View
There are phases of .none, .lifting, .dragging
dragStateDidChange lets you customize the look of your cells or drop items based on their current state
There is a delegate method that lets you clip or crop cell images if there are borders that you don't want to be shown in your drop item preview
Nothing earth shattering here. As expected, these foundational UI building blocks work well with drag and drop with minimal customization required but you can tweak the experience if you like. Placeholders for async cell loading is a nice addition.
Start by importing Accelerate Much faster and more energy efficient than vsmul, vclip, sgemm for matrix and vector manipulation Don't write your own code for matrix multiplication, use Accelerate BNNS functions in Accelerate are the backbone of CoreML
LZFSE on GitHub High performance
Basic Neural Network Subroutines High performance kernels for ML
You can generally convert a trained model from 32 bit floating point values to 8 bit unsigned ints without losing precission
Enhancements to perf for functions used by CoreML and Vision
Good for small vector and matrix math
SceneKit leverages simd
Matrix multiplication is more performant and readable the BLAS or GLKit
Support for Quaternions?!?!
Basic linear algebra subroutines & Linear Algebra PACKage
Sparse Solver on Watch 2 beat Dense Solver on the MacBook Air in a race and it wasn't close
Iterative Method is only faster on huge vectors and matricies
Use Accelerate for faster and more efficient code that is hardware optimized for low level graphics or ML code
This was an extremely advanced talk on linear algebra concepts. If you aren't writing custom shaders or building a neural network framework from scratch, you won't get much out of it.
Core Bluetooth is the framework to interact with BluetoothLE devices
Frameworks like Apple Music Service and iBeacon let you interact with no BTLE implementation
iOS and macOS devices are allowed to be the central and the peripheral
A BTLE device can for example, read the time off of your iPhone
The GATT database manages services and characteristics for managing transfers
Enhancements to state preservation and restoration
State callbacks now persist even across device reboot or other Bluetooth system events
NOTE: Apple calls killing an app "force quit" through the app switcher
New property will tell your app if more data can be sent
Support for iOS, macOS, tvOS, and now watchOS
tvOS is foreground only and Central only, limited to 2 simultaneous devices, peripherals are disconnected when your app moves to the background
watchOS is similar to tvOS, central only and 2 simultaneous connections only, disconnect when app suspended
watchOS only supported on Watch Series 2
Both tvOS and watchOS
This is the protocol Core Bluetooth uses and now it's available directly to developers
PSM can be thought of as the TCP port for L2CAP
There is also peripheral support for L2CAP, you can specify if encryption should be used or not
The CBL2CAPChannl class encapsulates a lot of this functionality
You get an end encountered callback when channel is closed
Use L2CAP when GATT doesn't meet your needs, when you want the best performance or lowest overhead, good for large updates like a firmware update
Discovery timeline can be optimized by using shortest advertising interval possible but beware of energy tradeoffs
Reconnecting - You can connect directly if you stored the identifier
Discovering the GATT database performs better the fewer services or characteristics you use
Support GATT caching
When making a device, use the latest chipset / Bluetooth standards (4.2 or 5.0)
You can achieve an increase from 2.5kbps to nearly 400kbps using L2CAP directly with EDL can get to near 400kbps for write only transfers
Support for Watch Series 2 and direct access to the L2CAP protocol are the big news here. There are also a lot of oppotunities to increase connection speeds with the latest Bluetooth and L2CAP.
There is a UISupportsDocumentBroswer key you need to set to YES in your info.plist
UIDocumentBrowserViewController has a didRequestDocumentCreationWithHandler delegate method that let's you create documents
Other delegate methods get called when document creation completed, failed
You configure the Document Types your document browser view controller can pick in a different section of the info.plist
UIDocument works naturally with UIDocumentBrowserViewController and gives you a lot of features out of the box
Your UIDocument subclass is where you load the actual document
A UIDocumentViewController subclass is where you open and close the UIDocument object
The UIDocumentBrowserViewController presents your document view controllers
There are 3 styles of UIDocumentBrowserViewController interfaces: dark, light, and white
The tintColor of the browser controller's view updates almost every control or element, together, these two properties let you quickly update the entire color scheme of your UI
This shows a pop over in springboard with a preview of the documents available to open
The Xcode template implements open in place for you
Calls your app delegate, you can check if the inputURL is a fileURL and if so, handle opening and presenting it
UIDocumentBrowserAction lets you define an action and a completion handler
Seems like a nice block based API, these seem to be a theme of recent CocoaTouch APIs and of the conference
Let you customize creating or opening an existing document
UIDocumentBrowserViewController creates the transitioning view controller for you
All you need to do is set the target view from the destination view controller and implement the UIViewControllerTransitioningDelegate protocol
Works for presenting and dismissing the document view controller
There is a fileAttributesToWrite delegate method on your UIDocument subclass for files created by your application
There is also a new Thumbnail Extension that works system-wide under the QuickLook framework
The cloud provider asks QuickLook to look for any extensions with the thumbnail types
You can only provide thumbnails for UTIs that you own
You can draw the thumbnail or provide an image file URL
This is pretty sweet and will result in a rich platform wide document access system
This is a big set of APIs. The team seems to have really thought this through and all of the features you would expect are here. You can get started with a base implementation by using UIDocument based documents with UIDocumentBrowserViewController and reach deeper for more powerful customizations like non iCloud cloud providers, VC transitions, and document thumbnails.
🚧 Some nice improvements to UITesting performance, they re-designed the way the system queries for UI elements
You can chain together multi app testing now by specifying the bundle ID of the app you'd like to launch or activate
You can organize like groups of test methods into Activities now, this is probably a nicer approach than the page object model our team is using now but we'll need to explore it further
You can control + click the test diamond to jump to the test report or other quick actions
The big takeaway was that you can take screen shots and save them to disk now
You can even view in the split pane editor in Xcode
You can customize when the images should be saved or discarded via the scheme settings or in the UITest code
Very nice ability to capture a full screen screenshot or a shot of an individual element, this his huge
🚧
New app drawer UI
When a user installs your app via the Messages App Store or the main App Store, it is installed by default in Messages and set to the most recent app
Now you can use send() API to post messages directly without the user needing to hit send
Similar to insert() API from iOS 10
Make sure to clearly denote that when they tap an element, it will send right away
Requirements:
- Application must be visible (not in background)
- Can send one message per interaction only
- New error codes were added to handle these cases
You can add completely custom views with maps, live updating countdowns, text - whatever you want to the conversation
You can have different views for sender and receiver
Tapping a live message can open your iMessage app in a different presentation style like full screen
This uses MSMessagesAppViewController for the view in the conversation and the app itself in the keyboard area
MSMessageLayout lets you customize the app bubble with MSMessageTemplateLayout
MSMessageLiveLayout is new in iOS 11 lets you on devices that have your app installed and are on the latest xOS version
Use .transcript presentation style for display in the conversation in your MSMessagesAppViewController subclass
Use .compact / .expanded for display in the keyboard area
Override contentSizeThatFits to account for larger system fonts due to dynamic type
NOTE: There is a .lineHeight property on UIFont objects
There is an isPending property that lets you know if your vc is in the preview pane about to be sent
Use safeAreaInsets property on UIView in iOS 11
There is a summaryText property on MSMessage that will now be used for notifications when a text comes in