christianselig

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        Task {
            // 1️⃣❓ UIViewController is in a MainActor context, so this Task
            // will inherit that, so the following pretend expensive call will
            // be on the main thread and likely block?
            ExpensiveOperationPerformer.doExpensiveLoopAndPrint()
        }

mzero

These are instructions for building a stand alone, headless, music computer based on the Pisound audio card and a RaspberryPi 3.

I use this set up in my live performance rig where it does all of the following without breaking a sweat:

• Audio effects
• stutter gate (beat sync'd)

tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

kean

// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation
import Alamofire
import RxSwift
import RxCocoa

// This post is **archived**. For a modern version that uses Async/Await and Actors, see the new article

aparrish

aparrish

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

mbigatti

//
//  UIColor+RGB.swift
//  Copyright (c) 2014 Massimiliano Bigatti. All rights reserved.
//

import Foundation
import UIKit

/**
    UIColor extension that add a whole bunch of utility functions like:

floriankugler

NSURLConnection                                                                                             | NSURLSession
------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------
NSURLConnectionDelegate            connectionShouldUseCredentialStorage:                                    |
------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------
NSURLConnectionDelegate            connection:willSendRequestForAuthenticationChallenge:                    | NSURLSessionDelegate            URLSession:didReceiveChallenge:completionHandler:
                                                                                                            | N

ddeville

#if TARGET_OS_IPHONE
#import <MobileCoreServices/MobileCoreServices.h>
#else
#import <CoreServices/CoreServices.h>
#endif

/*
	MIME type to UTI
*/
NSURLResponse *response = ... // assume a URL response from somewhere else.