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
9.1k
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
770
Working at Cookpad UK
yuseinishiyama
2
3.6k
Building iOS apps at scale (Mobilization)
yuseinishiyama
4
1.8k
Working at Scale
yuseinishiyama
3
830
Building iOS apps at scale
yuseinishiyama
2
1.4k
Reduce Build Times and Get Home Eariler
yuseinishiyama
2
790
How to make your app international
yuseinishiyama
3
7.6k
Safer Networking Layer With Swift
yuseinishiyama
0
290
Making Your App Static
yuseinishiyama
13
4.2k
Other Decks in Technology
See All in Technology
What's new in Go 1.24?
ciarana
1
110
Windows の新しい管理者保護モード
murachiakira
0
200
Ruby on Railsで持続可能な開発を行うために取り組んでいること
am1157154
3
140
OSS構成管理ツールCMDBuildを使ったAWSリソース管理の自動化
satorufunai
0
640
Change Managerを活用して本番環境へのセキュアなGUIアクセスを統制する / Control Secure GUI Access to the Production Environment with Change Manager
yuj1osm
0
100
IAMのマニアックな話2025
nrinetcom
PRO
2
250
日経のデータベース事業とElasticsearch
hinatades
PRO
0
230
短縮URLをお手軽に導入しよう
nakasho
0
140
MIMEと文字コードの闇
hirachan
2
1.4k
IAMポリシーのAllow/Denyについて、改めて理解する
smt7174
2
200
Oracle Database Technology Night #87-1 : Exadata Database Service on Exascale Infrastructure(ExaDB-XS)サービス詳細
oracle4engineer
PRO
1
170
30→150人のエンジニア組織拡大に伴うアジャイル文化を醸成する役割と取り組みの変化
nagata03
0
150
Featured
See All Featured
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
21
2.5k
The World Runs on Bad Software
bkeepers
PRO
67
11k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
It's Worth the Effort
3n
184
28k
Product Roadmaps are Hard
iamctodd
PRO
50
11k
A better future with KSS
kneath
238
17k
Fontdeck: Realign not Redesign
paulrobertlloyd
83
5.4k
YesSQL, Process and Tooling at Scale
rocio
172
14k
Scaling GitHub
holman
459
140k
Building a Scalable Design System with Sketch
lauravandoore
461
33k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
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?