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
370
Tiny Networking in Swift
chriseidhof
2
19k
Functional Swift - Brooklyn
chriseidhof
3
1.2k
Functional Swift - SF
chriseidhof
6
26k
Functional Swift
chriseidhof
6
1.2k
Functional Swift
chriseidhof
1
140
Functional Programming in Swift
chriseidhof
40
19k
Lighter View Controllers
chriseidhof
4
190
Parsing with Blocks
chriseidhof
2
220
Other Decks in Programming
See All in Programming
3 Effective Rules for Using Signals in Angular
manfredsteyer
PRO
0
120
Laravel や Symfony で手っ取り早く OpenAPI のドキュメントを作成する
azuki
2
120
Figma Dev Modeで変わる!Flutterの開発体験
watanave
0
150
Jakarta EE meets AI
ivargrimstad
0
240
flutterkaigi_2024.pdf
kyoheig3
0
150
광고 소재 심사 과정에 AI를 도입하여 광고 서비스 생산성 향상시키기
kakao
PRO
0
170
[Do iOS '24] Ship your app on a Friday...and enjoy your weekend!
polpielladev
0
110
PHP でアセンブリ言語のように書く技術
memory1994
PRO
1
170
Outline View in SwiftUI
1024jp
1
330
受け取る人から提供する人になるということ
little_rubyist
0
250
Remix on Hono on Cloudflare Workers
yusukebe
1
300
Amazon Qを使ってIaCを触ろう!
maruto
0
420
Featured
See All Featured
4 Signs Your Business is Dying
shpigford
180
21k
Fashionably flexible responsive web design (full day workshop)
malarkey
405
65k
Designing for humans not robots
tammielis
250
25k
The Cult of Friendly URLs
andyhume
78
6k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
232
17k
Done Done
chrislema
181
16k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
27
840
Large-scale JavaScript Application Architecture
addyosmani
510
110k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
31
2.7k
Ruby is Unlike a Banana
tanoku
97
11k
A Philosophy of Restraint
colly
203
16k
Art, The Web, and Tiny UX
lynnandtonic
297
20k
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?