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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
USFBTUSBJO5BOBLB3ZPHB
ͦͷ4XJGUίʔυɺ
͜͏ॻ͖͑ͯΈͳ͍͔
1PMJTIJOHZPVS4XJGUDPEFXJUINF
1
DeNA
×
STORES
×
ϥΫϚ iOS Meetup!! #dena_stores_rakuma
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
"CPVUNF
USFBTUSBJO5BOBLB3ZPHB
2
4XJGU J04
XBUDI04
$PSF/'$
044
ɹɹJU`TNZNPUIFSUPOHVF
ɹɹ࠷ۙ#MVFTLZΛ͡Ί·ͨ͠
ɹɹɹɹɹɹɹɹɹɹ!USFBTUSBJOɹɹIUUQTUSFUKQ
%F/"$P
-UE
ɹɹJ04"QQ%FWFMPQFSʢ"QSJM$VSSFOUʣ
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
BoolΛస͢Δʹtoggle()Λ͏
flag = !flagΑΓΘ͔Γ͍͢
w !ͰసͰ͖Δ͚Ͳʜʜ
3
var flag = true
flag = !flag
print(flag) // false
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
BoolΛస͢Δʹtoggle()Λ͏
flag = !flagΑΓΘ͔Γ͍͢
4
struct Hoge {
var fuga1 = Fuga(); var fuga2 = Fuga()
struct Fuga {
var piyo1 = Piyo(); var piyo2 = Piyo()
struct Piyo {
var flag = true
}
}
}
var hoge = Hoge()
hoge.fuga1.piyo2.flag = !hoge.fuga2.piyo1.flag // fuga1ɾ2ɺpiyo2ɾ1 ͕ٯʂ
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
BoolΛస͢Δʹtoggle()Λ͏
flag = !flagΑΓΘ͔Γ͍͢
w toggle()ͰಡΈ͘͢ɺهड़ϛεͷ৺ݮΔ
5
flag.toggle()
hoge.fuga1.piyo2.flag.toggle()
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
isMultiple(of:)Λ͏
x % 2 == 0Θͳ͍
w ӳޠͷจষͷΑ͏ʹಡΊͯɺՄಡੑ্͕
6
let x = 4
print(x % 2 == 0) // true - `%` ԋࢉࢠΛ༻͍Δྫ
print(x & 1 == 0) // true - `&` ԋࢉࢠΛ༻͍Δྫ
print(x.isMultiple(of: 2)) // true - ӳޠͷจষͷΑ͏ʹಡΊΔ
print(x.isMultiple(of: 3)) // false
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯͷendIndexΛ͏
countͬΆ͍͚ΕͲ
w ʮ࠷ޙͷΠϯσοΫεʯΛࣔ͢
w count0 O
ɺendIndex0
7
let list = ["DeNA", "STORES", "Rakuten Rakuma”]
print(list.count) // 3
print(list.endIndex) // 3
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯ͕ۭ͔Ͳ͏͔isEmptyͰಘΔ
count == 0Θͳ͍
w ಡΈ͍͢
w count0 O
ɺisEmpty0
8
let list1 = ["DeNA", "STORES", "Rakuten Rakuma"]
print(list1.count == 0) // false
print(list1.isEmpty) // false
var list2 = list1
list2.removeAll()
print(list2.count == 0) // true
print(list2.isEmpty) // true
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯͷΠϯσοΫεindexed()ͰಘΔ
enumerated()zip(_:_:)Ͱͳ͘
w enumerated()ཁૉͱҰॹʹʮ0͔Β࢝·Δ࿈൪ʯΛฦ͢
9
let prefectures = ["Hokkaido", "Aomori", "Iwate", "Miyagi", "Akita", "Yamagata", “Fukushima"]
for (offset, prefecture) in prefectures.enumerated() {
print(offset, prefecture, prefectures[offset])
/*
0 Hokkaido Hokkaido
1 Aomori Aomori
2 Iwate Iwate
3 Miyagi Miyagi
4 Akita Akita
5 Yamagata Yamagata
6 Fukushima Fukushima
*/
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯͷΠϯσοΫεindexed()ͰಘΔ
enumerated()zip(_:_:)Ͱͳ͘
w ʮ0͔Β࢝·Δ࿈൪ʯͱʮίϨΫγϣϯͷΠϯσοΫεʯҰக͠ͳ͍͔
10
let tohoku = prefectures.dropFirst()
for (offset, prefecture) in tohoku.enumerated() {
print(offset, prefecture, prefectures[offset])
/*
0 Aomori Hokkaido
1 Iwate Aomori
2 Miyagi Iwate
3 Akita Miyagi
4 Yamagata Akita
5 Fukushima Yamagata
*/
}
print(tohoku[0]) // 💥 Fatal error: Index out of bounds
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯͷΠϯσοΫεindexed()ͰಘΔ
enumerated()zip(_:_:)Ͱͳ͘
w ඪ४తͳସҊzip(_:_:)enumerated()ΑΓύϑΥʔϚϯε͕ѱ͍
11
for (index, prefecture) in zip(tohoku.indices, tohoku) {
print(index, prefecture, prefectures[index])
/*
1 Aomori Aomori
2 Iwate Iwate
3 Miyagi Miyagi
4 Akita Akita
5 Yamagata Yamagata
6 Fukushima Fukushima
*/
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ίϨΫγϣϯͷΠϯσοΫεindexed()ͰಘΔ
enumerated()zip(_:_:)Ͱͳ͘
w 4XJGU"MHPSJUINTͷindexed()zip(_:_:)ΑΓ
ύϑΥʔϚϯε͕ྑ͍
12
import Algorithms
for (index, prefecture) in tohoku.indexed() {
print(index, prefecture, prefectures[index])
/*
1 Aomori Aomori
2 Iwate Iwate
3 Miyagi Miyagi
4 Akita Akita
5 Yamagata Yamagata
6 Fukushima Fukushima
*/
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ೋॏͷϧʔϓproduct(_:_:)Λ͏
for-inΛճॻ͘ඞཁ͕ͳ͘ͳΔ
13
let years = [2021, 2022, 2023]
let months = ["January", "February", "March", /* ... */]
for year in years {
for month in months {
print(year, month)
/*
2021 January
2021 February
2021 March
...
2022 January
2022 February
2022 March
...
*/
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ೋॏͷϧʔϓproduct(_:_:)Λ͏
for-inΛճॻ͘ඞཁ͕ͳ͘ͳΔ
w 4XJGU"MHPSJUINTͷproduct(_:_:)ͰωετΛݮΒͤΔ
w Ұํ͕ۭͷ߹ɺແବͳϧʔϓॲཧ͕ൃੜ͠ͳ͍
14
import Algorithms
for (year, month) in product(years, months) {
print(year, month)
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
for-inͱforEach(_:)ͷ͍͚Λߟ͑ͯΈΔ
forEach(_:)ࣗମfor-inͰ࣮͞Ε͍ͯΔ͚Ͳ
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func printWithLowercased(_ value: String) {
print(value.lowercased())
}
let list = ["DeNA", "STORES", "Rakuten Rakuma"]
for name in list {
printWithLowercased(name)
}
// ಉ͡ग़ྗ
list.forEach { name in
printWithLowercased(name)
}
// ಉ͡ग़ྗ
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
for-inͱforEach(_:)ͷ͍͚Λߟ͑ͯΈΔ
forEach(_:)ࣗମfor-inͰ࣮͞Ε͍ͯΔ͚Ͳ
16
for-inϧʔϓ forEach(_:)
ϧʔϓΛ్தͰΊΔ breakΛ͏ Ͱ͖ͳ͍
ॲཧͷ్தͰ࣍ͷཁૉʹҠΔ continueΛ͏ returnΛ͏
SFUVSOจΛ͏ͱ ϧʔϓ͕͋Δείʔϓ͔Βग़Δ ࣍ͷཁૉͷॲཧʹҠΔ
ཁૉ໊ͷলུ Ͱ͖ͳ͍ Ͱ͖Δʢ$0ʣ
ؔͳͲΛ͢ Ͱ͖ͳ͍ Ͱ͖ΔʢforEach(someFunc())ʣ
ඇಉظʢBTZODBXBJUʣॲཧ Ͱ͖Δ Ͱ͖ͳ͍
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
໊લۭؒʢ/BNFTQBDFTʣʹenumΛ͏
classstructͰͳ͘
w structclassΛ͏ͱɺ
internalͰ͑ΔΠχγϟϥΠβ͕σϑΥϧτͰ༻ҙ͞Εͯ͠·͏
17
enum BreakfastMenu {
static let rice = "͝൧"
static let bread = "ύϯ"
// ...
}
print(BreakfastMenu.rice) // ͝൧
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ϥϯμϜͳɾཁૉ͕΄͍͠
arc4random()arc4random_uniform(_:)Θͳ͍
w 4XJGU͔Β͑ΔΑ͏ʹͳͬͨ
random()ɾrandom(in:)ɾrandomElement()Λ͏
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let flag = Bool.random()
let num = Int.random(in: 0..<10)
let area = [1: "Shibuya", 2: "Shinjuku"].randomElement()
let player = ["uhooi", "treastrain"].randomElement()
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
Optional.map(_:)Λ͏
nilͷͱ͖nilͷ··ɺnilͰͳ͍ͱ͖͚ͩॲཧΛߦ͏
w nilͷͱ͖ʜͷذΛࣗͰॻ͔ͳͯ͘ࡁΉ
19
struct Talk {
let title: String
}
let selectedTalkTitle: String? = nil
let selectedTalk: Talk? = selectedTalkTitle.map { Talk(title: $0) }
print(selectedTalk) // nil
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ʮOptionalͳvarʯΛʮඇ0QUJPOBMͳletʯʹ
ʮHFU͢Δͱ͖·ͰʹඞͣTFU͞Ε͍ͯΔʯϓϩύςΟͰ
20
enum Area {
case osaka, hiroshima
}
let area: Area = // ...
var okonomiyaki: String?
switch area {
case .osaka:
okonomiyaki = "ؔ෩"
case .hiroshima:
okonomiyaki = "ౡ෩"
}
print(okonomiyaki)
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ʮOptionalͳvarʯΛʮඇ0QUJPOBMͳletʯʹ
ʮHFU͢Δͱ͖·ͰʹඞͣTFU͞Ε͍ͯΔʯϓϩύςΟͰ
21
enum Area {
case osaka, hiroshima
}
let area: Area = // ...
let okonomiyaki: String
switch area {
case .osaka:
okonomiyaki = "ؔ෩"
case .hiroshima:
okonomiyaki = "ౡ෩"
}
print(okonomiyaki)
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
͋ͱ͔ΒTFU͞ΕΔϓϩύςΟΛOptionalʹ͠ͳ͍
ඞͣTFU͞ΕΔͳΒpreconditionFailure(_:file:line:)ΛԾஔ͖͢Δ
22
import UIKit
final class ViewController: UIViewController {
// ͜ͷ collectionView viewDidLoad() ͷޙʹ࡞Δ͜ͱʹ͍ͯ͠ΔʢͱԾఆʣ
private var collectionView: UICollectionView?
override func viewDidLoad() {
super.viewDidLoad()
// collectionView Λ࡞Δ
collectionView = UICollectionView(frame: .null)
// ...
// collectionView Λ͏
view.addSubview(collectionView!)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
͋ͱ͔ΒTFU͞ΕΔϓϩύςΟΛOptionalʹ͠ͳ͍
ඞͣTFU͞ΕΔͳΒpreconditionFailure(_:file:line:)ΛԾஔ͖͢Δ
23
import UIKit
final class ViewController: UIViewController {
// ͜ͷ collectionView viewDidLoad() ͷޙʹ࡞Δ͜ͱʹ͍ͯ͠ΔʢͱԾఆʣ
private lazy var collectionView: UICollectionView =
{ preconditionFailure("collectionView has not been set") }()
override func viewDidLoad() {
super.viewDidLoad()
// collectionView Λ࡞Δ
collectionView = UICollectionView(frame: .null)
// ...
// collectionView Λ͏
view.addSubview(collectionView)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
֦ுʢ&YUFOTJPOTʣϓϩτίϧʢ1SPUPDPMTʣ͝ͱʹ࡞Δ
ͦͷϓϩτίϧͷ४ڌͷͨΊͷ࣮ͦͷதͰͷΈߦ͏
24
import Foundation
struct Book {
let name: String
let uuid: UUID
}
extension Book: Identifiable, Hashable {
var id: UUID { uuid }
}
extension Book {
func hash(into hasher: inout Hasher) {
hasher.combine(id)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
֦ுʢ&YUFOTJPOTʣϓϩτίϧʢ1SPUPDPMTʣ͝ͱʹ࡞Δ
ͦͷϓϩτίϧͷ४ڌͷͨΊͷ࣮ͦͷதͰͷΈߦ͏
25
import Foundation
struct Book {
let name: String
let uuid: UUID
}
extension Book: Identifiable {
var id: UUID { uuid }
}
extension Book: Hashable {
func hash(into hasher: inout Hasher) {
hasher.combine(id)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
֦ுʢ&YUFOTJPOTʣϓϩτίϧʢ1SPUPDPMTʣ͝ͱʹ࡞Δ
ͦͷϓϩτίϧͷ४ڌͷͨΊͷ࣮ͦͷதͰͷΈߦ͏
w 4XJGU6*ͷྫ
26
import SwiftUI
struct ContentView: View {
let greeting = "Hello, happy world!"
var body: some View { // ϓϩτίϧ View ଆͷఆٛͰ @MainActor ʹͳ͍ͬͯΔ
Text(greeting)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
֦ுʢ&YUFOTJPOTʣϓϩτίϧʢ1SPUPDPMTʣ͝ͱʹ࡞Δ
ͦͷϓϩτίϧͷ४ڌͷͨΊͷ࣮ͦͷதͰͷΈߦ͏
w 4XJGU6*ͷྫ
27
import SwiftUI
struct ContentView: View {
let greeting = "Hello, happy world!"
}
extension ContentView {
var body: some View { // 😫 ҉తʹ @MainActor Ͱͳ͘ͳΓɺ
// ϓϩτίϧ View ଆͷఆٛͱҟͳͬͯ͠·͏
Text(greeting)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
֦ுʢ&YUFOTJPOTʣϓϩτίϧʢ1SPUPDPMTʣ͝ͱʹ࡞Δ
ͦͷϓϩτίϧͷ४ڌͷͨΊͷ࣮ͦͷதͰͷΈߦ͏
w 4XJGU6*ͷྫ
28
import SwiftUI
struct ContentView {
let greeting = "Hello, happy world!"
}
extension ContentView: View {
var body: some View { // ✅ ϓϩτίϧ View ଆͷఆٛΑΓ
// ҉తʹ @MainActor ʹͳΔ
Text(greeting)
}
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ͦͷ΄͔͔͑ͨͬͨ͜ͱ
͕࣌ؒΓͳ͔ͬͨʜʜ
w switchจͰͪΌΜͱཏͯ͠ɺ
ݟམͱ͠Λແͨ͘͠Γޙͷมߋʹڧͨ͘͠Γ͢Δ
w Resultͱεϩʔؔʢ5ISPXJOH'VODUJPOTʣͷ૬ޓม
w %FMFHBUFɾΫϩʔδϟΛBTZODͳؔʹ͢Δ
w NotificationCenterΛ4XJGU$PODVSSFODZ͔Β͏
w $PNCJOFɾ3Y4XJGUΛ4XJGU$PODVSSFODZ͔Β͏
29
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
͞ΒʹεςοϓΞοϓ
6*,JUʢJ04ͳͲʣͰʮͬͪ͜ͷํ͕͍͍Αʯ
30
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
ɹɹɹɹɹεϥΠυɾൃද༰IUUQTUSFUKQͰެ։͍ͯ͠·͢ɹ⏩
ͦͷ4XJGUίʔυɺ
͜͏ॻ͖͑ͯΈͳ͍͔
1PMJTIJOHZPVS4XJGUDPEFXJUINF
31
DeNA
×
STORES
×
ϥΫϚ iOS Meetup!! #dena_stores_rakuma