Antol Antol

Async/Await for Swift

Proposal: SE-XXXX
Authors: Chris Lattner, Joe Groff

Introduction

Modern Cocoa development involves a lot of asynchronous programming using closures and completion handlers, but these APIs are hard to use. This gets particularly problematic when many asynchronous operations are used, error handling is required, or control flow between asynchronous calls gets complicated. This proposal describes a language extension to make this a lot more natural and less error prone.

This paper introduces a first class Coroutine model to Swift. Functions can opt into to being async, allowing the programmer to compose complex logic involving asynchronous operations, leaving the compiler in charge of producing the necessary closures and state machines to implement that logic.

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волков бояться - в лесу не свиззлить
не все золото что свиззлит
свиззлинг - всему голова
и рыбку съесть, и посвиззлить
в большой семье свиззлом не щелкают

##junior developer

знает основы программирования на Objective C (Swift)
программирует в Xcode
знает основы git
читал Mobile Human Interface Guidelines
знает и использует базовые паттерны (MVC, делегаты, нотификейшены)
знает что такое протоколы, делегаты, категории
знает и использует основные элементы интерфейса (UIWindow, UIView, UINavigationBar, UIToolbar, UITabBarController)
знает жизненный цикл UIView в UIViewController'е
знает жизненный цикл приложения

Author: https://www.cyanhall.com/

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

	######################
	# Options
	######################
	NULL=

	REVEAL_ARCHIVE_IN_FINDER=false

	FRAMEWORK_NAME="${PROJECT_NAME}"

	SIMULATOR_LIBRARY_PATH="${BUILD_DIR}/${CONFIGURATION}-iphonesimulator/${FRAMEWORK_NAME}.framework"

	@interface UIImage (fixOrientation)

	- (UIImage *)fixOrientation;

	@end