Uzo iamuzo

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)

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo since a gist is too difficult to maintain as an open source endevaor and there is no way to version it. I have updated below, but I will not be able to keep this one up to date so please checkout the repo instead. The below is just for some preservation for those who stumble across here.

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Dependency Injection in Ruby 07 Oct 04

Introduction

At the 2004 Ruby Conference, Jamis Buck had the unenviable task to explain Dependency Injection to a bunch of Ruby developers. First of all, Dependency Injection (DI) and Inversion of Control (IoC) is hard to explain, the benefits are subtle and the dynamic nature of Ruby make those benefits even more marginal. Furthermore examples using DI/IoC are either too simple (and don’t convey the usefulness) or too complex (and difficult to explain in the space of an article or presentation). I once attempted to explain DI/IoC to a room of Java programmers (see onestepback.org/articles/dependencyinjection/), so I can’t pass up trying to explain it to Ruby developers.

Thanks goes to Jamis Buck (the author of the Copland DI/IoC framework) who took the time to review this article and provide feedback.

What is Dependency Injection?

~/Code/Learning/personal/firestore-codelab-extended-swift
› firebase --version
7.10.0

~/Code/Learning/personal/firestore-codelab-extended-swift
› firebase login
Already logged in as iamuzoagu@gmail.com

~/Code/Learning/personal/firestore-codelab-extended-swift

	import UIKit

	class SelectionTableCell: UITableViewCell {

	override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
	super.init(style: style, reuseIdentifier: reuseIdentifier)
	self.selectionStyle = .none
	}

	required init?(coder aDecoder: NSCoder) {

	enum NotificationNames: String {
	case UserDataChanged: "UserDataChangedNotificationName"
	case ReceivedAlert: "ReceivedAlertNotificationName"
	case PeanutButterJellyTime: "ItsPeanutButterJellyTimeNotificationName"
	}

	# Recursively diff two hashes, showing only the differing values.
	# By Henrik Nyh <http://henrik.nyh.se> 2009-07-14 under the MIT license.
	#
	# Example:
	#
	# a = {
	# "same" => "same",
	# "diff" => "a",
	# "only a" => "a",
	# "nest" => {

	[
	// Hide sidebar tree icons
	{
	"class": "icon_file_type",
	"content_margin": 0
	},
	{
	"class": "icon_folder",
	"content_margin": 0
	},