gonzalezreal

iOS Cell Registration & Reusing with Swift Protocol Extensions and Generics

A common task when developing iOS apps is to register custom cell subclasses for both UITableView and UICollectionView. Well, that is if you don’t use Storyboards, of course.

Both UITableView and UICollectionView offer a similar API to register custom cell classes:

public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)

alexaubry

How to run Vapor with Docker in Heroku

In this tutorial you'll learn how to run a Vapor server in a Docker container on Heroku.

Recently, Heroku added the ability to run Docker images on their Runtime. You can use this system instead of the traditional buildpack-based system for various reasons, mainly for having more control over the environment your server will run on.

Prerequisites

To complete this tutorial, you'll need:

christianselig

import Foundation

extension String {
    /// Converts an ISO 8601 formatted `String` into `NSDateComponents`.
    ///
    /// - Note: Does not accept fractional input (e.g.: P3.5Y), must be integers (e.g.: P3Y6M).
    /// - SeeAlso: https://en.wikipedia.org/wiki/ISO_8601#Durations
    /// - Returns: If valid ISO 8601, an `NSDateComponents` representation, otherwise `nil`.
    func ISO8601DateComponents() -> NSDateComponents? {
        // Regex adapted from Moment.js https://github.com/moment/moment/blame/develop/src/lib/duration/create.js#L16

gbitaudeau

extension Int {

    func formatUsingAbbrevation () -> String {
        let numFormatter = NSNumberFormatter()

        typealias Abbrevation = (threshold:Double, divisor:Double, suffix:String)
        let abbreviations:[Abbrevation] = [(0, 1, ""),
                                           (1000.0, 1000.0, "K"),
                                           (100_000.0, 1_000_000.0, "M"),
                                           (100_000_000.0, 1_000_000_000.0, "B")]

lattner

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.

nathanfjohnson

// Swift 4
// Check out the history for contributions and acknowledgements.

extension String {
  /// Returns a new string made by replacing all HTML character entity references with the corresponding character.
  ///
  /// - Returns: decoded string
  func decodingHTMLEntities() -> String {
    var result = String()
    var position = startIndex

proteye

import 'dart:convert';
import 'dart:math';
import 'dart:typed_data';
import "package:pointycastle/export.dart";
import "package:asn1lib/asn1lib.dart";

List<int> decodePEM(String pem) {
  var startsWith = [
    "-----BEGIN PUBLIC KEY-----",
    "-----BEGIN PRIVATE KEY-----",