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
Cocoa Touch: The Good, The Bad and The Ugly
Search
Chris Eidhof | @chriseidhof
December 16, 2013
Programming
2
190
Cocoa Touch: The Good, The Bad and The Ugly
This is a talk I gave at Alt Tech Talks London, as a try out for MCE.
Chris Eidhof | @chriseidhof
December 16, 2013
Tweet
Share
More Decks by Chris Eidhof | @chriseidhof
See All by Chris Eidhof | @chriseidhof
Dutch FP Day 2015
chriseidhof
2
380
Tiny Networking in Swift
chriseidhof
2
19k
Functional Swift - Brooklyn
chriseidhof
3
1.2k
Functional Swift - SF
chriseidhof
6
26k
Functional Swift
chriseidhof
6
1.3k
Functional Swift
chriseidhof
1
150
Functional Programming in Swift
chriseidhof
40
19k
Lighter View Controllers
chriseidhof
4
200
Parsing with Blocks
chriseidhof
2
230
Other Decks in Programming
See All in Programming
TanStack DB ~状態管理の新しい考え方~
bmthd
2
180
Introduction to Git & GitHub
latte72
0
110
あのころの iPod を どうにか再生させたい
orumin
2
2.5k
CEDEC2025 長期運営ゲームをあと10年続けるための0から始める自動テスト ~4000項目を50%自動化し、月1→毎日実行にした3年間~
akatsukigames_tech
0
140
decksh - a little language for decks
ajstarks
4
21k
【第4回】関東Kaggler会「Kaggleは執筆に役立つ」
mipypf
0
650
MLH State of the League: 2026 Season
theycallmeswift
0
100
兎に角、コードレビュー
mitohato14
0
140
サーバーサイドのビルド時間87倍高速化
plaidtech
PRO
0
170
Go製CLIツールをnpmで配布するには
syumai
2
1.2k
Microsoft Orleans, Daprのアクターモデルを使い効率的に開発、デプロイを行うためのSekibanの試行錯誤 / Sekiban: Exploring Efficient Development and Deployment with Microsoft Orleans and Dapr Actor Models
tomohisa
0
160
UbieのAIパートナーを支えるコンテキストエンジニアリング実践
syucream
2
620
Featured
See All Featured
Balancing Empowerment & Direction
lara
2
580
Statistics for Hackers
jakevdp
799
220k
Mobile First: as difficult as doing things right
swwweet
223
9.9k
Docker and Python
trallard
45
3.5k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
4 Signs Your Business is Dying
shpigford
184
22k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
110
20k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Scaling GitHub
holman
462
140k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
131
19k
Transcript
None
Cocoa Touch The Good, The Bad and The Ugly Chris
Eidhof
Cocoa Touch The Ugly, The Good and The Bad Chris
Eidhof
commit c416c1d259bddaa74833e6df5acd770f85622293 Author: Chris Eidhof <
[email protected]
> Date: Wed Jan 7
11:54:34 2009 +0100 Empty project
None
None
I thought I was a pretty good programmer
I knew PHP, Ruby and Haskell
How hard can it be?
None
The ugly
Example code @interface HiscoreTableViewCell : UITableViewCell { IBOutlet UIImageView *badge;
IBOutlet UILabel *badgeTitle; IBOutlet UILabel *name1; IBOutlet UILabel *name2; IBOutlet UILabel *name3; IBOutlet UILabel *position1; IBOutlet UILabel *position2; IBOutlet UILabel *position3; IBOutlet UILabel *score1; IBOutlet UILabel *score2; IBOutlet UILabel *score3; }
Example code (continued) @property (nonatomic,readonly) UIImageView* badge; @property (nonatomic,readonly) UILabel
*badgeTitle; @property (nonatomic,readonly) UILabel *name1; @property (nonatomic,readonly) UILabel *name2; @property (nonatomic,readonly) UILabel *name3; @property (nonatomic,readonly) UILabel *position1; @property (nonatomic,readonly) UILabel *position2; @property (nonatomic,readonly) UILabel *position3; @property (nonatomic,readonly) UILabel *score1; @property (nonatomic,readonly) UILabel *score2; @property (nonatomic,readonly) UILabel *score3;
Example code (continued) @synthesize badge; @synthesize badgeTitle; @synthesize name1; @synthesize
name2; @synthesize name3; @synthesize position1; @synthesize position2; @synthesize position3; @synthesize score1; @synthesize score2; @synthesize score3;
There's more
//TODO: as of here, it is completely broken if ([gameView
superview] != nil) { [[SoundBoard sharedSoundBoard] startMenuTune]; [menuViewController viewWillAppear:YES]; [gameViewController viewWillDisappear:YES]; [gameView removeFromSuperview]; [gameViewController viewDidDisappear:YES]; [menuViewController viewDidAppear:YES]; } else {
NSURL *cgiUrl = [NSURL URLWithString:POST_SCORE_URL]; NSMutableURLRequest *p = [NSMutableURLRequest requestWithURL:cgiUrl];
[p setTimeoutInterval:4]; [p setHTTPMethod:@"POST"]; [p setHTTPBody:requestData]; NSURLResponse *response = nil; NSError *error = nil; NSData *responseData = [NSURLConnection sendSynchronousRequest:p returningResponse:&response error:&error];
Memory Management 1. Add an instance variable 2. Add a
property 3. Add a synthesize 4. Add a dealloc call
Memory Management 1. Add an instance variable 2. Add a
property 3. Add a synthesize 4. Add a dealloc call
Memory Management
Animations [UIView beginAnimations:@"GameOver" context:NULL]; [UIView setAnimationDuration:0.3]; [UIView setAnimationRepeatCount:2]; [UIView setAnimationRepeatAutoreverses:YES];
// Call animateOtherStuff when the animation is done [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector: @selector(afterGameOverAnimation:finished:context:)];
Animations 2013 [UIView animateWithDuration:0.3 animations:^{ timesUp.alpha = 1; } completion:^(BOOL
finished) { [self.milkGlass removeFromSuperview]; }]
None
The Good
If there's only one thing you'll remember Write code for
the person after you
▸ Write a lot of code ▸ Work with other
people ▸ Write articles ▸ Read books and code
Write a lot of code ▸ Lots of production code
▸ Lots of throwaway code
Throwaway code
Collaborate ▸ With people who are better than you ▸
Or who aren't better than you
Write Forces you to think.
Absolute Knowledge
Perceived Knowledge
Strive to become better
Ship
Frameworks
2013 ▸ Use ARC ▸ Use properties
Core Data
What prevents me from using Core Data at this point
is my concern for scalability and performance. It’s possible I’m just being thick-headed. — Brent Simmons, 27 Sep 2013
So last weekend I switched from SQLite/FMDB to Core Data.
This may come as a surprise. — Brent Simmons, 05 Oct 2013
None
Core Data ▸ Relationships ▸ Batching ▸ NSFetchedResultsControlle r ▸
Speed of use
Code style
My model was the NSURLConnectionDelegate Model should not know about
the webservice
Using NSDictionary everywhere Create value objects
Value Objects @interface Person : NSObject @property (nonatomic,copy,readonly) NSString* name;
@property (nonatomic,strong,readonly) NSDate* birthDate; @property (nonatomic,readonly) NSUInteger numberOfKids; - (instancetype)initWithName:(NSString*)name birthDate:(NSDate*)birthDate numberOfKids:(NSUInteger)numberOfKids; @end
Immutable Objects Use lots of them.
Deep code paths - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex { if (alertState
== submitScore && game.score > 0) { // 20 lines if (result != nil && [resultKeys containsObject:@"position"] && [resultKeys containsObject:@"neededPoints"] && [resultKeys containsObject:@"deviceHighscore"] && [resultKeys containsObject:@"personalHighscore"]) { // 10 lines if (position == 1) {
Deep code paths Pull out things into separate, well-named methods
Building everything in code Use Interface Builder
Writing fast code Write clear code, only optimize after measuring.
None
Tips and Tricks
Initializers [[HiscoresViewController alloc] initWithNibName:@"HiscoresView" bundle:nil]
Initializers // In HiscoresViewController.m - (id)init { self = [super
initWithNibName:@"HiscoresView" bundle:nil]; if (self) { } return self; }
Use constants if (buttonIndex == 0)
Use constants if (buttonIndex == StartButton)
Pull out variable names if ([game state] == running ||
self.trainingMode)
Pull out variable names BOOL shouldPauseGame = [game state] ==
running || self.trainingMode; if (shouldPauseGame)
Pulling out protocols For example: UITableViewDataSource
@interface FetchedResultsControllerDataSource : NSObject <UITableViewDataSource, NSFetchedResultsControllerDelegate>
- (NSInteger)numberOfSectionsInTableView:(UITableView*)t { return self.fetchedResultsController.sections.count; }
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)sectionIndex { id<NSFetchedResultsSectionInfo> section; section = self.frc.sections[sectionIndex]; return
section.numberOfObjects; }
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)ip { id object = [self objectAtIndexPath:indexPath]; id
cell = [tableView dequeueReusableCellWithIdentifier:ruI forIndexPath:ip]; [self.delegate configureCell:cell withObject:object]; return cell; }
Write small files I aim for a 100 line limit
Write small files 154 ./ViewControllers/THUserPrioritiesViewController.m 154 ./ViewControllers/THZoomingNavigationController.m 155 ./Extensions/NSArray+Extensions.m 155
./Extensions/UIView+Extensions.m 168 ./Controllers/THPriorityTimelineCollectionController.m 179 ./Controllers/THUserScreenInstancesController.m 183 ./ViewControllers/THRootViewController.m 183 ./ViewControllers/THScreenInstanceViewController.m 185 ./Model/User+Extensions.m 192 ./ViewControllers/THEditPriorityViewController.m 221 ./ViewControllers/THScreeningBarViewController.m 243 ./Views/THTimeLineView.m 263 ./ViewControllers/THCardsViewController.m 279 ./Views/THSkillboxView.m
Write small files find . -name "*.m" -exec wc -l
"{}" \; | sort -n
Keep your view controllers light This is the least reusable
code you'll write
Use protocols instead of inheritance
None
The Bad
None
None
About me ▸ @chriseidhof ▸ http://www.objc.io ▸ http://chris.eidhof.nl
Questions?