Malte Bünz mltbnz

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.

###Sketch trial non stop

Open hosts files:

$ open /private/etc/hosts

Edit the file adding:

127.0.0.1 backend.bohemiancoding.com

127.0.0.1 bohemiancoding.sketch.analytics.s3-website-us-east-1.amazonaws.com

Using a rotary encoder as a volume control

On my RetroPie machine I wanted a hardware volume knob — the games I play use a handful of emulators, and there's no unified software interface for controlling the volume. The speakers I got for my cabinet are great, but don't have their own hardware volume knob. So with a bunch of googling and trial and error, I figured out what I need to pull this off: a rotary encoder and a daemon that listens for the signals it sends.

Rotary encoder

A rotary encoder is like the standard potentiometer (i.e., analog volume knob) we all know, except (a) you can keep turning it in either direction for as long as you want, and thus (b) it talks to the RPi differently than a potentiometer would.

I picked up this one from Adafruit, but there are plenty others available. This rotary encoder also lets you push the knob in and treats that like a button press, so I figured that would be useful for toggling mute on and off.

Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \

	import SwiftUI

	private let linkDetector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)

	struct LinkColoredText: View {
	enum Component {
	case text(String)
	case link(String, URL)
	}

	//
	// MKMapView+ZoomLevel.swift
	// Monizze
	//
	// Created by Dylan Gyesbreghs on 23/06/2017.
	// Copyright © 2017 DGyesbreghs. All rights reserved.
	// https://oleb.net/blog/2010/05/set-the-zoom-level-of-mkmapview/
	//

	import MapKit

	GET /addons/dbmobile.cfg HTTP/1.1
	host: reiseauskunft.bahn.de
	Connection: keep-alive
	Proxy-Connection: keep-alive
	Accept: /
	User-Agent: DB%20Navigator/00 CFNetwork/758.3.15 Darwin/15.4.0
	Accept-Language: de-de
	Authorization: Basic YXBwOmJhaG5kaXJla3Q=
	Accept-Encoding: gzip, deflate