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SWIFT 6 EDITION
B
a
ck t
o t
h e f
ut
ur
e
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App maker and content creator based in Barcelona
Hi! I’m Pol
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A
n
n
o u
ncemen
t
H
el
m
I
s s hi
p
p
i
n g
T
o d
a
y
!
Whe
n
A
p
p
l
e
ap
p
rov
e
i
t!
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polpiella.dev
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S
wi
f t
6
H
ow t
o get r
e
a
d
y f
o r
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6.0.0
M
a
jo r v
er
sio n
B
r
e
a
k
i
ng c
h
a
nge
s
P
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sio n
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sio n
N
o n
-
br
e
a
k
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sid er
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bl
e c h
a
nge
s
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6.0.0
P
n
B
c
M
n
N
s
M
a
jo r v
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sio n
B
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a
k
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S
w
if t
6
SE-0270
SE-0364
SE-0408
SE-0410 SE-0416
SE-0418
SE-0421
SE-0412 SE-0411
SE-0286
SE-0274
SE-0220
SE-0301 SE-0405
SE-0409
SE-0420 SE-0422
SE-0384
SE-0383
SE-0401
SE-0337
SE-0354
SE-0352
SE-0414
SE-0426
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S
w
if t
6
SE-0270
SE-0364
SE-0408
SE-0410 SE-0416
SE-0418
SE-0421
SE-0412 SE-0411
SE-0286
SE-0274
SE-0220
SE-0301 SE-0405
SE-0409
SE-0420 SE-0422
SE-0384
SE-0383
SE-0401
SE-0337
SE-0354
SE-0352
SE-0414
SE-0426
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S
wift
6
Lan
guag
e M
o
d
e
!
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h
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t
ps
://
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/
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1654567329?
i
=1000653584114
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S
w
if t
6
SE-0270
SE-0364
SE-0408
SE-0410 SE-0416
SE-0418
SE-0421
SE-0412 SE-0411
SE-0286
SE-0274
SE-0220
SE-0301 SE-0405
SE-0409
SE-0420 SE-0422
SE-0384
SE-0383
SE-0401
SE-0337
SE-0354
SE-0352
SE-0414
SE-0426
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S
w
if t
6
Wit
ho u
t
t
h
e S
wi
ft
6 la
n
g ua
ge
mo d
e
S
w
if t
6
SE-0270
SE-0364
SE-0408
SE-0410 SE-0416
SE-0418
SE-0421
SE-0412 SE-0411
SE-0286
SE-0274
SE-0220
SE-0301 SE-0405
SE-0409
SE-0420 SE-0422
SE-0384
SE-0383
SE-0401
SE-0337
SE-0354
SE-0352
SE-0414
SE-0426
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S
wi
f t
6
H
ow t
o get r
e
a
d
y f
o r t
he
L
a
n
g
u
a
ge mo d e
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D
own
l
o
a
d i
n
g
S
wi
ft
6
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#!
/bin/sh
# Install `swiftenv`
brew install kylef/formulae/swiftenv
echo 'if which swiftenv > /dev/null; then eval "$(swiftenv init -)"; fi'
>>
~/.zshrc
I
n
s
t
a
l
l o n m
a
c
OS
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#!
/bin/sh
# Install `swiftenv`
brew install kylef/formulae/swiftenv
echo 'if which swiftenv > /dev/null; then eval "$(swiftenv init -)"; fi'
>>
~/.zshrc
# Install the latest Swift 6 development toolchain
swiftenv install 6.0-DEVELOPMENT-SNAPSHOT-2024-04-30-a
I
n
s
t
a
l
l o n m
a
c
OS
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#!
/bin/sh
# Install `swiftenv`
brew install kylef/formulae/swiftenv
echo 'if which swiftenv > /dev/null; then eval "$(swiftenv init -)"; fi'
>>
~/.zshrc
# Install the latest Swift 6 development toolchain
swiftenv install 6.0-DEVELOPMENT-SNAPSHOT-2024-04-30-a
# CD into your Swift package directory
cd your-swift-package
# Set the Swift 6 toolchain as the default for this directory
swiftenv local 6.0-DEVELOPMENT-SNAPSHOT-2024-04-30-a
I
n
s
t
a
l
l o n m
a
c
OS
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#!
/bin/sh
# Install swiftly
curl -L https:
//
swift-server.github.io/swiftly/swiftly-install.sh | bash
# Install the latest Swift 6 development toolchain
swiftly install 6.0-DEVELOPMENT-SNAPSHOT-2024-04-30-a
# Set the Swift 6 toolchain as the active toolchain
swiftly use 6.0-DEVELOPMENT-SNAPSHOT-2024-04-30-a
I
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l o n l
i
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ux
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class NonIsolated {
func callee() async {}
}
actor Isolated {
let nonIsolated = NonIsolated()
func callee() async {
await nonIsolated.callee()
}
}
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/
/
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v10_15), .iOS(.v13)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]
)
],
targets: [
.target(name: "Swift6Examples")
],
swiftLanguageVersions: [.version("6")]
)
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/
/
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v10_15), .iOS(.v13)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]
)
],
targets: [
.target(name: "Swift6Examples")
],
swiftLanguageVersions: [.version("6")]
)
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swift build -Xswiftc -swift-version -Xswiftc 6
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I HAVE NO IDEA, I
DON’T THINK YOU CAN
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U
p
c o m
i
n
g
F
e
a
t
ur
e
s
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h
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ps
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md
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//
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "UpcomingFeatures",
products: [
.library(
name: "UpcomingFeatures",
targets: ["UpcomingFeatures"]),
],
dependencies: [
],
targets: [
.target(
name: "UpcomingFeatures",
swiftSettings: [
.enableUpcomingFeature("InternalImportsByDefault")
]
)
]
)
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#if hasFeature(InternalImportsByDefault)
fileprivate import MyDependency
#else
import MyDependency
#endif
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B
r
e
a
k
i
ng
ch
a
n
ge
s
A
q ui ck t
o ur o f t
he swift
6
Lan
g uag
e M
o
d
e
!
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h
t t
ps
://
f
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.
swi
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t
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p
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-6-
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ge
-
mo d e
/68315
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C
o n
cu
r
r
enc
y
ch
e
ck
i
ng
SE-0337
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//
swift-tools-version: 5.10
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v14)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableExperimentalFeature("StrictConcurrency")
]
)
]
)
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I
t
hi
nk m
a
n
y p
e
o p
l
e b el
ie v
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o u t ur
n o n c o mp
l
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d f
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t
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ue
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n how
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SE-0401
A
c
t
o r i
s o l
a
t
io n
p
r
o p
er
t
y
w
r
a
p
p
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r
s
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final class Model: ObservableObject {
let name: String
init(name: String = "Hello!") {
self.name = name
}
}
struct MyView: View {
@StateObject private var model = Model()
var body: some View {
Text("Hello, \(model.name)")
.onAppear { viewAppeared() }
}
func viewAppeared() {
updateUI()
}
}
@MainActor func updateUI() {
/*
do stuff here
*
/
}
Non-is
ol a t
ed
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final class Model: ObservableObject {
let name: String
init(name: String = "Hello!") {
self.name = name
}
}
struct MyView: View {
@StateObject private var model = Model()
var body: some View {
Text("Hello, \(model.name)")
.onAppear { viewAppeared() }
}
func viewAppeared() {
updateUI()
}
}
@MainActor func updateUI() {
/*
do stuff here
*
/
}
Iso
la
t e
d
t
o
t
h
e
G
lob
al M
ai
n
A
c
to
r
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final class Model: ObservableObject {
let name: String
init(name: String = "Hello!") {
self.name = name
}
}
struct MyView: View {
@StateObject private var model = Model()
var body: some View {
Text("Hello, \(model.name)")
.onAppear { viewAppeared() }
}
func viewAppeared() {
updateUI()
}
}
@MainActor func updateUI() {
/*
do stuff here
*
/
}
Iso
la
t e
d
t
o M
ain
Ac
t
o
r
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final class Model: ObservableObject {
let name: String
init(name: String = "Hello!") {
self.name = name
}
}
struct MyView: View {
@StateObject private var model = Model()
var body: some View {
Text("Hello, \(model.name)")
.onAppear { viewAppeared() }
}
func viewAppeared() {
updateUI()
}
}
@MainActor func updateUI() {
/*
do stuff here
*
/
}
Iso
la
t e
d
t
o M
ain
Ac
t
o
r
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//
swift-tools-version: 5.10
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v14)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableExperimentalFeature("StrictConcurrency"),
.enableUpcomingFeature(“DisableOutwardActorInference")
]
)
]
)
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//
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v14)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableExperimentalFeature("StrictConcurrency"),
.enableUpcomingFeature("DisableOutwardActorInference"),
.enableExperimentalFeature("RegionBasedIsolation"),
.enableUpcomingFeature("IsolatedDefaultValues"),
.enableUpcomingFeature("GlobalConcurrency"),
.enableUpcomingFeature("InferSendableFromCaptures")
]
)
],
swiftLanguageVersions: [.version("6")]
)
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SE-0274
C
o n
cis e
m
a
gic f
il
e
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public extension XCTestCase {
func assertInstancesAreDeallocated(
_ instances: [AnyObject],
line: UInt = #line,
file: StaticString = #file
) {
let instancesContainer = NSHashTable.weakObjects()
instances.forEach { instancesContainer.add($0) }
addTeardownBlock {
instancesContainer.allObjects.forEach {
XCTAssertNil($0, file: file, line: line)
}
}
}
}
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public extension XCTestCase {
func assertInstancesAreDeallocated(
_ instances: [AnyObject],
line: UInt = #line,
file: StaticString = #file
) {
let instancesContainer = NSHashTable.weakObjects()
instances.forEach { instancesContainer.add($0) }
addTeardownBlock {
instancesContainer.allObjects.forEach {
XCTAssertNil($0, file: file, line: line)
}
}
}
}
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//
swift-tools-version: 5.8
import PackageDescription
let package = Package(
name: "Swift6Examples",
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.testTarget(
name: "Swift6ExamplesTests",
dependencies: ["Swift6Examples"],
swiftSettings: [
.enableUpcomingFeature("ConciseMagicFile")
]
)
]
)
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#if hasFeature(ConciseMagicFile)
/ /
In Swift 6 Language Mode
XCTAssertEqual(#file, "Swift6ExamplesTests/Swift6ExamplesTests.swift")
#else
/ /
In Swift 5 Language Mode
XCTAssertEqual(
#file,
"…/swift-6-swiftcraft/Tests/Swift6ExamplesTests/Swift6ExamplesTests.swift"
)
#endif
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#if hasFeature(ConciseMagicFile)
/ /
In Swift 6 Language Mode
XCTAssertEqual(#file, "Swift6ExamplesTests/Swift6ExamplesTests.swift")
#else
/ /
In Swift 5 Language Mode
XCTAssertEqual(
#file,
"…/swift-6-swiftcraft/Tests/Swift6ExamplesTests/Swift6ExamplesTests.swift"
)
#endif
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R
e
gex
l
i
t
er
a
ls
SE-0354
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let pattern = #"WIFI:S:(?[^;]+);(
?:
T:(?[^;]*);)?P:(?[^;]+);(
?:
H:(?[^;]*);)?;"#
let regularExpression = try! NSRegularExpression(pattern: pattern)
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//
swift-tools-version: 5.7
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v14)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableUpcomingFeature("BareSlashRegexLiterals")
]
)
]
)
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let regex = /WIFI:S:(?[^;]+);(
? :
T:(?[^;]*);)?P:(?[^;]+);(
?:
H:(?[^;]*);)?;/
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SE-0286
T
r
a
i
l
i
ng
cl
o s
ur
e
s
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struct TestStructure {
let firstClosure: ((String)
->
Void)?
let secondClosure: ((String, Int)
-
>
Void)?
init(
firstClosure: ((String)
->
Void)? = nil,
secondClosure: ((String, Int)
-
>
Void)? = nil
) {
self.firstClosure = firstClosure
self.secondClosure = secondClosure
}
}
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struct TestStructure {
let firstClosure: ((String)
- >
Void)?
let secondClosure: ((String, Int)
->
Void)?
init(
firstClosure: ((String)
- >
Void)? = nil,
secondClosure: ((String, Int)
->
Void)? = nil
) {
self.firstClosure = firstClosure
self.secondClosure = secondClosure
}
}
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struct TestStructure {
let firstClosure: ((String)
- >
Void)?
let secondClosure: ((String, Int)
->
Void)?
init(
firstClosure: ((String)
- >
Void)? = nil,
secondClosure: ((String, Int)
->
Void)? = nil
) {
self.firstClosure = firstClosure
self.secondClosure = secondClosure
}
}
let a = TestStructure { a in
print(a)
}
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struct TestStructure {
let firstClosure: ((String)
- >
Void)?
let secondClosure: ((String, Int)
->
Void)?
init(
firstClosure: ((String)
- >
Void)? = nil,
secondClosure: ((String, Int)
->
Void)? = nil
) {
self.firstClosure = firstClosure
self.secondClosure = secondClosure
}
}
let a = TestStructure { a in
print(a)
}
let b = TestStructure { a, b in
print(a, b)
}
War
n in
g!
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//
swift-tools-version: 5.10
import PackageDescription
let package = Package(
name: "Swift6Examples",
platforms: [.macOS(.v14)],
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableUpcomingFeature(“ForwardTrailingClosures")
]
)
]
)
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struct TestStructure {
let firstClosure: ((String)
- >
Void)?
let secondClosure: ((String, Int)
->
Void)?
init(
firstClosure: ((String)
- >
Void)? = nil,
secondClosure: ((String, Int)
->
Void)? = nil
) {
self.firstClosure = firstClosure
self.secondClosure = secondClosure
}
}
let a = TestStructure { a in
print(a)
}
let b = TestStructure { a, b in
print(a, b)
}
let c = TestStructure(secondClosure: { a, b in
print(a, b)
})
Ok!
Er
r
o
r
!
Ok!
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I
mp
l
i
ci
t
O
p
en
e
xis
t
en
t
i
a
ls
SE-0352
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protocol WithSelfRequirement: Equatable {}
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Er
r
o
r
!
protocol WithSelfRequirement: Equatable {}
func testOpenExistential(selfRequirementProtocol: WithSelfRequirement) {
}
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protocol WithSelfRequirement: Equatable {}
func testOpenExistential(selfRequirementProtocol: any WithSelfRequirement) {
}
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protocol WithSelfRequirement: Equatable {}
func testOpenExistential(selfRequirementProtocol: any WithSelfRequirement) {
}
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protocol WithSelfRequirement: Equatable {}
func requiresOpeningOfExistential(openExistential: T) {
}
func testOpenExistential(selfRequirementProtocol: any WithSelfRequirement) {
}
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protocol WithSelfRequirement: Equatable {}
func requiresOpeningOfExistential(openExistential: T) {
}
func testOpenExistential(selfRequirementProtocol: any WithSelfRequirement) {
requiresOpeningOfExistential(openExistential: selfRequirementProtocol)
}
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func printType(_ type: ExpectedType.Type) {
print(type)
}
let type: any Any.Type = Int.self
printType(type) Er
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//
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "Swift6Examples",
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
swiftSettings: [
.enableUpcomingFeature(“ImplicitOpenExistentials”)
]
)
]
)
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SE-0383
d e p
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import AppKit
@NSApplicationMain
final class MyApplication: NSResponder, NSApplicationDelegate {
// .. .
}
import UIKit
@UIApplicationMain
final class MyApplication: UIResponder, UIApplicationDelegate {
// .. .
}
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import AppKit
@NSApplicationMain
final class MyApplication: NSResponder, NSApplicationDelegate {
// .. .
}
import UIKit
@UIApplicationMain
final class MyApplication: UIResponder, UIApplicationDelegate {
// .. .
}
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import AppKit
@main
final class MyApplication: NSResponder, NSApplicationDelegate {
// .. .
}
import UIKit
@main
final class MyApplication: UIResponder, UIApplicationDelegate {
// .. .
}
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//
swift-tools-version: 5.10
import PackageDescription
let package = Package(
name: "Swift6Examples",
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
targets: [
.target(
name: "Swift6Examples",
swiftSettings: [
.enableUpcomingFeature("DeprecateApplicationMain")
]
)
]
)
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SE-0409
I
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t
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n
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l
i
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t
s
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import DependencyExample
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private
package
public import DependencyExample
internal
fileprivate
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//
swift-tools-version: 5.9
import PackageDescription
let package = Package(
name: "Swift6Examples",
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
dependencies: [
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableExperimentalFeature("AccessLevelOnImport"),
]
),
.target(name: "DependencyExample")
]
)
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public import DependencyExample
=
=
import DependencyExample
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public import DependencyExample
=
=
import DependencyExample
internal import DependencyExample
= =
import DependencyExample
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//
swift-tools-version: 6.0
import PackageDescription
let package = Package(
name: "Swift6Examples",
products: [
.library(
name: "Swift6Examples",
targets: ["Swift6Examples"]),
],
dependencies: [
],
targets: [
.target(
name: "Swift6Examples",
dependencies: ["DependencyExample"],
swiftSettings: [
.enableExperimentalFeature("AccessLevelOnImport"),
.enableUpcomingFeature("InternalImportsByDefault")
]
),
.target(name: "DependencyExample")
]
)
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No content
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#!
/usr/bin/swift
private import Foundation
let fileManager = FileManager.default
let currentDirectory = fileManager.currentDirectoryPath
let swiftFiles = fileManager.enumerator(atPath: currentDirectory)?
.compactMap { $0 as? String }
.filter { $0.hasSuffix(".swift") }
for file in swiftFiles
??
[] {
let filePath = "\(currentDirectory)/\(file)"
guard let content = try? String(contentsOfFile: filePath) else {
continue
}
let updatedContent = content
.replacingOccurrences(of: #"import (\w+)"#, with: "public import $1",
options: .regularExpression)
try? updatedContent.write(toFile: filePath, atomically: true, encoding: .utf8)
}
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👋
@_implementationOnly
?
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SE-0384
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A
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SE-0274
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SE-0337
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SE-0383
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SE-0352
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SE-0418
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SE-0409
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SE-0384
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SE-0411
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SE-0286
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SE-0354
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SE-0412
F
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enc
y
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T
h
a
n k
YOU!
A
n
y
q ue
s
t
io n s
?
Dow
n
loa
d He
l
m
Fin
d me o
n
l
i
ne
!