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
Lighter View Controllers
Search
Chris Eidhof | @chriseidhof
February 18, 2014
Programming
5
440
Lighter View Controllers
Talk at Cocoaheads.nl
(Architecture image by Manu Cornet)
Chris Eidhof | @chriseidhof
February 18, 2014
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
約9000個の自動テストの 時間を50分->10分に短縮 Flakyテストを1%以下に抑えた話
hatsu38
23
11k
飲食業界向けマルチプロダクトを実現させる開発体制とリアルな現状
hiroya0601
1
400
What’s New in Compose Multiplatform - A Live Tour (droidcon London 2024)
zsmb
1
350
Go言語でターミナルフレンドリーなAIコマンド、afaを作った/fukuokago20_afa
monochromegane
2
140
PagerDuty を軸にした On-Call 構築と運用課題の解決 / PagerDuty Japan Community Meetup 4
horimislime
1
110
PHP でアセンブリ言語のように書く技術
memory1994
PRO
1
150
カスタムしながら理解するGraphQL Connection
yanagii
1
1.2k
Golang と Erlang
taiyow
8
1.9k
Nuxtベースの「WXT」でChrome拡張を作成する | Vue Fes 2024 ランチセッション
moshi1121
1
530
Vue.js学習の振り返り
hiro_xre
2
130
Server Driven Compose With Firebase
skydoves
0
400
EventSourcingの理想と現実
wenas
6
2.1k
Featured
See All Featured
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
7
150
Designing Experiences People Love
moore
138
23k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
29
2.2k
Become a Pro
speakerdeck
PRO
24
5k
Teambox: Starting and Learning
jrom
132
8.7k
Building a Modern Day E-commerce SEO Strategy
aleyda
38
6.9k
How to train your dragon (web standard)
notwaldorf
88
5.7k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
92
16k
Bash Introduction
62gerente
608
210k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
32
1.8k
Side Projects
sachag
452
42k
Large-scale JavaScript Application Architecture
addyosmani
510
110k
Transcript
Lighter View Controllers Chris Eidhof CocoaHeads NL
MVC Model View Controller
MVC Model View Controller Massive View Controller
None
What's the largest file? find . -name "*.m" -exec wc
-l "{}" \; | sort -n
Steps Project: A complete OS in < 20K lines
View Controllers are the least reusable part
A view controller intermediates between model and view
Model logic
View logic
View layout
Web Service
Too much already?
Delegates
IBActions ?
Pragma marks ??
None
Child View Controllers
Table View Controllers ☆ Editing Mode ☆ Keyboard notifications ☆
Flashing scroll indicators ☆ Clearing Selection ☆ Pull to Refresh
None
None
View Controller Transitions
None
Pulling out protocols
For example: UITableViewDataSource
Creating a separate data source object @interface FetchedResultsControllerDataSource : NSObject
<UITableViewDataSource, NSFetchedResultsControllerDelegate>
Creating a separate data source object - (NSInteger)numberOfSectionsInTableView:(UITableView*)t { return
self.fetchedResultsController.sections.count; }
Creating a separate data source object - (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)sectionIndex {
id<NSFetchedResultsSectionInfo> section; section = self.frc.sections[sectionIndex]; return section.numberOfObjects; }
Creating a separate data source object Working with the delegate
- (UITableViewCell*)tableView:(UITableView*)tv cellForRowAtIndexPath:(NSIndexPath*)ip { id object = [self objectAtIndexPath:indexPath]; id cell = [tv dequeueReusableCellWithIdentifier:ruI forIndexPath:ip]; [self.delegate configureCell:cell withObject:object]; return cell; }
Advantages of a separate data source ☆ Lighter view controller
☆ Testable ☆ Reusable And you can do this for other protocols, too...
A separate data source ☆ NSArrayDataSource ☆ NSFRCollectionViewController ☆ ...
Categories
Configuring a cell - (UITableViewCell*)tableView:(UITableView*)tv cellForRowAtIndexPath:(NSIndexPath*)ip { PhotoCell *cell =
[tableView dequeueReusableCellWithIdentifier:@"PhotoCell"]; Photo *photo = [self itemAtIndexPath:indexPath]; cell.photoTitleLabel.text = photo.name; NSString* date = [self.dateFormatter stringFromDate:photo.creationDate]; cell.photoDateLabel.text = date; }
Configuring a cell Pulling out the reusable part @implementation PhotoCell
(ConfigureForPhoto) - (void)configureForPhoto:(Photo *)photo { self.photoTitleLabel.text = photo.name; NSString* date = [self.dateFormatter stringFromDate:photo.creationDate]; self.photoDateLabel.text = date; } @end
Configuring a cell The refactored delegate method - (UITableViewCell *)tableView:(UITableView
*)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { PhotoCell *cell = [tableView dequeueReusableCellWithIdentifier:PhotoCellIdentifier]; [cell configureForPhoto:[self itemAtIndexPath:indexPath]]; return cell; }
Using Interface Builder
None
Intentions
Intentions View Controllers may only contain code that effects view
changes in response to data changes. Source: http://bendyworks.com/geekville/articles/ 2014/2/single-responsibility-principle-ios
Intentions The IBAction macro must not be used in a
View Controller
Intentions The @interface block in a View Controller's header file
must be blank.
Intentions A View Controller may not implement any extra *Delegate
or *DataSource protocols except for observing Model changes.
Intentions A View Controller may only do work in viewDidLoad
(or awakeFromNib), viewDidAppear, viewDidDisappear, and in response to an observed change in the model layer.
None
Testing
Testing View controllers are notoriously hard to test → Make
them light.
Commercial Break
None
None
Questions? @chriseidhof