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8IBUTOFXJO4XJGUͷ
ཁ💡
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ϗʔΠ
J04ΞϓϦΤϯδχΞ
w ͱ͖Ͳ͖4XJGUѪձͷ
ӡӦʹࢀՃ͍ͯ͠Δ
w ࿈ଓճ
w ॳͷΦϑϥΠϯ։࠵
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ͷ৽ػೳʹ͍ͭͯ͠·͢
4XJGU
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4&
JGࣜͱTXJUDI͕ࣜՃ͞Εͨ
// Swift 5.8
let isUhooi = {
switch monster {
case .uhooi:
return true
case .chibird:
return false
}
}()
// Swift 5.8
let foo = {
if bar == 0 {
return "Foo"
} else {
return "Bar"
}
}()
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4&
JGࣜͱTXJUDI͕ࣜՃ͞Εͨ
// Swift 5.9
let isUhooi =
switch monster {
case .uhooi: true
case .chibird: false
}
// Swift 5.9
let foo =
if bar == 0 {
"Foo"
} else {
"Bar"
}
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4&
"UUBDIFE.BDSPT͕Ճ͞Εͨ
// Swift 5.9
import Observation
@Observable
final class MonsterViewModel {
var name = ""
var description = ""
init(name: String, description: String) {
self.name = name
self.description = description
}
}
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4&
'SFFTUBOEJOH%FDMBSBUJPO.BDSPT͕Ճ͞Εͨ
// Swift 5.9
import PowerAssert
let a = -1
let b = 10
let c = 17
#assert(max(a, b) == c)
| | | | |
10 -1 10 | 17
false
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4&
ՄมͷܕΛநԽͰ͖Δ
// Swift 5.8
static func buildBlock(
_ c0: C0,
_ c1: C1,
_ c2: C2,
_ c3: C3,
_ c4: C4,
_ c5: C5,
_ c6: C6,
_ c7: C7,
_ c8: C8,
_ c9: C9
) -> TupleView<(C0, C1, C2, C3, C4, C5, C6, C7, C8, C9)> where C0 : View, C1 : View, C2 :
View, C3 : View, C4 : View, C5 : View, C6 : View, C7 : View, C8 : View, C9 : View {
TupleView((c0, c1, c2, c3, c4, c5, c6, c7, c8, c9))
}
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4&
ՄมͷܕΛநԽͰ͖Δ
// Swift 5.9
static func buildBlock(_ content: repeat each Content)
-> TupleView<(repeat each Content)> where repeat each Content : View {
TupleView((repeat each content))
}
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4&
$PNCJOFʹґଘͤͣࢹͰ͖Δ
// Swift 5.8
import Combine
final class MonsterViewModel: ObservableObject {
@Published var name: String
@Published var description: String
init(name: String, description: String) {
self.name = name
self.description = description
}
}
struct MonsterView: View {
@StateObject var viewModel: MonsterViewModel = .init(name: "Uhooi", description: "Foo")
var body: some View {
Text("Hello, \(viewModel.name)")
}
}
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4&
$PNCJOFʹґଘͤͣࢹͰ͖Δ
// Swift 5.9
import Observation
@Observable
final class MonsterViewModel {
var name = ""
var description = ""
init(name: String, description: String) {
self.name = name
self.description = description
}
}
struct MonsterView: View {
var viewModel: MonsterViewModel = .init(name: "Uhooi", description: "Foo")
var body: some View {
Text("Hello, \(viewModel.name)")
}
}
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4&
TUSVDUͱFOVNΛίϐʔෆՄೳʹ͢Δ
// Swift 5.8
struct S {
init() {
print("S: init()")
}
// ❌: Deinitializers may only be declared within a class or actor
deinit {
print("S: deinit")
}
}
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4&
TUSVDUͱFOVNΛίϐʔෆՄೳʹ͢Δ
// Swift 5.9
struct S: ~Copyable {
init() {
print("S: init()")
}
// ✅
deinit {
print("S: deinit")
}
}
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·ͱΊ
w ϚΫϩ͕ศརͦ͏
w ݴޠ༷͕ͲΜͲΜ͘͠ͳΔ
w ಛఆͷϓϥοτϑΥʔϜʢ%BSXJOʣʹґଘ͠ͳ͍Α͏ʹͳ͖͍ͬͯͯΔ
w 0CTFSWBUJPO
w 4XJGU'PVOEBUJPO