Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Bad Cocoa
Search
Delisa Mason
May 28, 2014
Programming
12
17k
Bad Cocoa
How-to guide for building the kind of code you will deeply regret later
Delisa Mason
May 28, 2014
Tweet
Share
More Decks by Delisa Mason
See All by Delisa Mason
Pod for Great Good
kattrali
2
420
AppKit for iOS Developers
kattrali
5
860
Crafting iOS Dev Tools in Redcar, the Ruby Editor
kattrali
2
770
Other Decks in Programming
See All in Programming
CSC305 Lecture 03
javiergs
PRO
0
230
開発者への寄付をアプリ内課金として実装する時の気の使いどころ
ski
0
340
Pull-Requestの内容を1クリックで動作確認可能にするワークフロー
natmark
1
400
ABEMAモバイルアプリが Kotlin Multiplatformと歩んだ5年 ─ 導入と運用、成功と課題 / iOSDC 2025
akkyie
0
310
After go func(): Goroutines Through a Beginner’s Eye
97vaibhav
0
210
Reduxモダナイズ 〜コードのモダン化を通して、将来のライブラリ移行に備える〜
pvcresin
2
660
詳しくない分野でのVibe Codingで困ったことと学び/vibe-coding-in-unfamiliar-area
shibayu36
2
1.7k
ポスターセッション: 「まっすぐ行って、右!」って言ってラズパイカーを動かしたい 〜生成AI × Raspberry Pi Pico × Gradioの試作メモ〜
komofr
0
890
非同期jobをtransaction内で 呼ぶなよ!絶対に呼ぶなよ!
alstrocrack
0
410
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
170
2025年版 サーバーレス Web アプリケーションの作り方
hayatow
23
25k
Web フロントエンドエンジニアに開かれる AI Agent プロダクト開発 - Vercel AI SDK を観察して AI Agent と仲良くなろう! #FEC余熱NIGHT
izumin5210
2
300
Featured
See All Featured
Git: the NoSQL Database
bkeepers
PRO
431
66k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Context Engineering - Making Every Token Count
addyosmani
4
160
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
52
5.6k
How GitHub (no longer) Works
holman
315
140k
Speed Design
sergeychernyshev
32
1.1k
Building Better People: How to give real-time feedback that sticks.
wjessup
368
20k
Into the Great Unknown - MozCon
thekraken
40
2.1k
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Documentation Writing (for coders)
carmenintech
75
5k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
Transcript
Bad Cocoa How to write the code of deep regret
quickly and easily - @kattrali
Think Monolithic ensure changing one part of an app requires
changing them all
Long Selector is Best Selector
Test Private Stuff ensure every test will break during refactors
maximize the number of mocks, stubs, and performSelector() calls
Do Not Write Tests no worries, the compiler will catch
your bugs
Use Delegates with Callbacks If you don't need asynchronous callbacks
for synchronous code, you aren't trying hard enough -initWithDelegate:callback:
Subclass Subclass Subclass things will be easy when you need
to swap out superclasses sometime!
Categoriception Extend your own classes with several categories instead of
containing each unit of related functionality in a single class
Maximize Responsibilities Per Class ensure the difficulty of changing individual
components later
Safely assign many responsibilities using protocols @class MyController : NSObject
<MyControllerDelegate, Why, God, Please, Stop, WithTheProtocols>
Safely assign many responsibilities using protocols BONUS: Make each component
of a protocol optional, for maximum flexibility and verbosity (and less warnings!!)
Procrastinate on Performance always wait until you have a problem
before opening Instruments.app
if (@"Avoid Static Analysis") goto fail; goto fail;
Always Swing the Heaviest Hammer NSOperation and Core Data all
day every day - maximize boilerplate code (GCD and NSCoding don't real)
Make Code Styles Inconsistent increase the difficulty of using or
extending your project avoid code style tools like clang- format and Uncrustify
Do not write documentation especially avoid easy-to-use tooling like appledoc
Optimize early Reduce duplication as soon as possible, making code
less flexible later
When in doubt, add to AppDelegate There is no better
place to dump bits of code which do not belong anywhere and need access to application state certainly not new classes
#define over static variables get the most of your available
memory for your numbers, strings, and colors
Thank you!