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WWDC19

Table of Contents

=================

Introducing Combine and Advances in Foundation - Thursday

Session materials: https://developer.apple.com/videos/play/wwdc2019/711/

Foundation Updates

Ordered Collection Diffing

let diff = bird.difference(from: bear)
let newBird = bear.applying(diff) // [b, i, r, d]
  • Applicable to any collection type

Data

Contiguity

  • struct Data becomes contiguous
    • public protocol ContiguousByte

Compression

let compressed = try data.compressed(using: BUILT_IN_COMPRESSION_ALGORITHM_ENUMS)

Units

  • Added new UnitDurations & a new UnitFrequency
  • UnitInformationStorage

Displaying a Date or Time

  • Relative Date Time Formatter!!!!

List Formatter

let listFormatter = ListFormatter()
let dateFormatter = dateFormatter()

listFormatter.itemFormatter = dateFormatter
let string = listFormatter.string(from: dates)

Operation Queue

queue.addBarrierBlock {
  save()
}
  • This guarantees that a given task is the only one running at a given particular time. Blocks the other remaining ones

Progress Reporting

let queue = OperationQueue()
queue.progressCount = SomeNumber
  • Be prepared for UWSB and SMB on iOS to take multiple and disappearing volumes into account

Swift Updates

Scanner

  • scanUpToCharacters(from:) & scanString()

FileHandle

  • A new error-based API

  • Use DataProtocol instead if [UIInt8]`

  • Format dates and lists with Formatter

  • Use OperationQueue s barrier and progress reporting

Introducing Combine -> The replacement for Rx!

  • A unified declarative API for processing values over time
  • Generic
  • Type safe
  • Composition first
  • Request driven

Publisher

  • Defines how values and error are produced
  • One key function: "subscribe"
  • Value type

Subscriber

  • Reference type
  • It can receive one subscription. N inputs and one completion

Operator

  • Like a mapper between Publisher and Subscriber

  • Adopts Publisher

  • struct Map

  • Ability to chain operators exactly like RxSwift

  • Chaining results in a cancellable

  • Combine adopts many known Rx patterns