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
え!? Swift使ってるのにそんな書きかたしてるのですか!?
Search
Yusei Nishiyama
November 25, 2014
Technology
28
9k
え!? Swift使ってるのにそんな書きかたしてるのですか!?
iOSアプリをSwiftらしいコードで記述するために
Yusei Nishiyama
November 25, 2014
Tweet
Share
More Decks by Yusei Nishiyama
See All by Yusei Nishiyama
Continuous Mobile App Delivery
yuseinishiyama
0
680
Working at Cookpad UK
yuseinishiyama
2
3.4k
Building iOS apps at scale (Mobilization)
yuseinishiyama
4
1.7k
Working at Scale
yuseinishiyama
3
780
Building iOS apps at scale
yuseinishiyama
2
1.2k
Reduce Build Times and Get Home Eariler
yuseinishiyama
2
730
How to make your app international
yuseinishiyama
3
7.5k
Safer Networking Layer With Swift
yuseinishiyama
0
270
Making Your App Static
yuseinishiyama
13
4.1k
Other Decks in Technology
See All in Technology
DDDにおける認可の扱いとKotlinにおける実装パターン / authorization-for-ddd-and-kotlin-implement-pattern
urmot
4
390
サーバーレスAPI(API Gateway+Lambda)とNext.jsで 個人ブログを作ろう!
shuntaka
PRO
0
560
dxd2024-生成AIに振り回された3か月間の成功と失敗/dxd2024-link-and-motivation
lmi
2
260
E2Eテスト自動化プラットフォームにおけるAIの活用
shift_evolve
0
180
DevIO2024_レガシー運用からの脱却 -クラウド活用の実践事例とベストプラクティス-
jun2882
0
210
エンジニアの生存戦略 〜クラウド潮流の経験から紐解く技術トレンドのメカニズムと乗りこなし方〜
shimy
9
1.9k
年間一億円削減した時系列データベースのアーキテクチャ改善~不確実性の高いプロジェクトへの挑戦~
lycorptech_jp
PRO
3
2.9k
OSSコミットしてZennの課題を解決した話
dyoshikawa1993
0
150
AIエージェントを現場に導入する目線とは
masahiro_nishimi
1
1.5k
ゆめみのアクセシビリティの現在地と今後
ryokatsuse
3
290
[NIKKEI Tech Talk]Bias for Action!! 実践から学ぶための仕組とコミュニティ / Community for Practice and Learning
kanamasa
0
260
推薦システムを本番導入する上で一番優先すべきだったこと~NewsPicks記事推薦機能の改善事例を元に~
morinota
0
120
Featured
See All Featured
Bash Introduction
62gerente
607
210k
How to Think Like a Performance Engineer
csswizardry
4
590
Music & Morning Musume
bryan
43
5.9k
Agile that works and the tools we love
rasmusluckow
325
20k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
17
8.7k
Adopting Sorbet at Scale
ufuk
71
8.8k
Being A Developer After 40
akosma
72
580k
Designing for humans not robots
tammielis
247
25k
GraphQLとの向き合い方2022年版
quramy
36
13k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
245
1.2M
Imperfection Machines: The Place of Print at Facebook
scottboms
262
13k
Building Flexible Design Systems
yeseniaperezcruz
323
37k
Transcript
͑!? SwiftͬͯΔͷʹͦΜͳ ॻ͖͔ͨͯ͠ΔͷͰ͔͢!? potatotips#11 @yuseinishiyama
Who am I? • Mobile app engineer at Cookpad Inc.
• Develop apps for iOS • Regulate “Auto Layout” day after day… :’-( • I’m interested in • Metal (new graphics API of Apple) • Functional programming (with Swift) • Reactive programming (Reactive Cocoa)
In Objective-C era… @interface SomeClass : NSObject @property (nonatomic, strong)
NSString *someString; @end ! @implementation SomeClass ! - (void)setSomeString:(NSString *)someString { _someString = someString; [self doSomething]; } ! - (void)doSomething { NSLog(@"I don't feel like doing anything..."); } ! @end ؆୯ʹೖ࣌ʹॲཧΛߦ͏͜ͱ͕Ͱ͖ͨ
With Swift class SomeClass { private var backingStore = ""
var value: String { get { return backingStore } set { backingStore = newValue doSomething() } } func doSomething() { println("I don't feel like doing anything.") } } 85'
Keep calm class SomeClass { var someString: String = ""
{ didSet { doSomething() } } func doSomething() { println("Now I’m sleeping. Please don’t disturb.") } } XJMM4FUEJE4FUΛ͑ಉ͜͡ͱ͕࣮ݱՄೳ
Coalesce fallback class Person { var name: String! } !
var quietPerson = Person() quietPerson.name = "Tom" ! var hisName: String! ! if quietPerson.name != nil { hisName = quietPerson.name } else { hisName = "I can't recognize what he says" }
Use `??` class Person { var name: String! } !
var quietPerson = Person() quietPerson.name = "Tom" ! var hisName = quietPerson.name ?? "I can't recognize what he says"
(Annoying) weakSelf pattern class SomeClass { var ivar: Int? func
methodA(function: ()->()) { function() } func methodB() { weak var weakSelf = self methodA { () -> () in weakSelf!.ivar = 3 } } }
use `[unowned self]` class SomeClass { var ivar: Int? func
methodA(function: ()->()) { function() } func methodB() { methodA { [unowned self] () -> () in self.ivar = 3 } } }
Static variables in function - (BOOL)toggleSwitch { static BOOL aSwitch
= true; aSwitch = !aSwitch; return aSwitch; }
4XJGUߏମͰ͔͠TUBUJDมΛαϙʔ τ͍ͯ͠ͳ͍ʜ
Use struct func toggleSwitch() -> Bool { struct Switch {
static var aSwitch = true } Switch.aSwitch = !Switch.aSwitch return Switch.aSwitch }
Cast var anyObject: AnyObject? = "WE ARE UPPERCASE" if anyObject
is String { let string = anyObject as String println(string.lowercaseString + "?") } ʁ
You can check, cast and bind in one line !
if let string = anyObject as? String { println(string.lowercaseString + "?") }
Trailing closure func methodX(i: Int, function: ()->(String)) { function() }
! methodX(1, { () -> (String) in return "Do nothing" } ) ! methodX(1) { () -> (String) in return "Do nothing" }
Swift array supports map, filter and reduce class Vehicle {
var numberOfTires: Int = 0 } class Car: Vehicle { override init() { super.init() numberOfTires = 4 } } class Bicycle: Vehicle { override init() { super.init() numberOfTires = 2 } } class Unicycle: Vehicle { override init() { super.init() numberOfTires = 1 } } let vehicles = [Car(), Car(), Unicycle(), Bicycle(), Car(), Unicycle()] var numberOfAllTires = vehicles.map{ $0.numberOfTires }.reduce(0, +)
Nested function func setUpViews() { func setupBarButton() { // set
up bar buttons } func setupRefreshControl() { // set up refresh control } setupBarButton() setupRefreshControl() } είʔϓΛอͬͨ··ɺॲཧΛߏԽ͢Δ͜ͱ͕Ͱ͖Δ
Enum with method enum MyTableViewSection: Int { case A =
0, B, C, D func heightForCell() -> CGFloat { switch self { case A: return 30 case B: return 44 case C: return 80 case D: return 44 } } } ! func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat { return MyTableViewSection(rawValue: indexPath.section)!.heightForCell() } ؔ࿈͢ΔॲཧΛ&OVNଆʹҠৡͨ͠΄͏͕Մಡੑ͕ߴ͍
Any Questions?