Slide 1
Slide 1 text
takasekಜ ࠷৽࡞
ɹ܅ ͷ ࢀ র ɻ
2016/9/16 Վب࠲.tech #11
1
Slide 2
Slide 2 text
·ͩdeinitͨ͜͠ͱͷͳ͍܅ (class)
Λɺ
ڧࢀর͍ͯ͠Δɻ
2
Slide 3
Slide 3 text
3
Slide 4
Slide 4 text
4
Slide 5
Slide 5 text
ɹ͕͍ͷͰɺ
ɹ·ͣ݁ɻ
5
Slide 6
Slide 6 text
classͷ
Πϯελϯεϝιου
selfͷڧࢀরΛ
͍࣋ͬͯΔͷͰ
ؾΛ͚ͭΖɻ
6
Slide 7
Slide 7 text
Ͱ
ຊελʔτ!
7
Slide 8
Slide 8 text
ϘλϯΛͻͱ͚ͭͩ࣋ͭ
UIViewαϒΫϥεͷίϯϙʔωϯτΛ࡞ͬͨͱ͠·͢ɻ
final class MyComponent: UIView {
@IBOutlet private var button: UIButton!
//Button͕ԡ͞ΕͨΒɺcallbackΛ࣮ߦ
var callback: (() -> Void)?
@IBAction func didButtonPush() {
callback?()
}
}
8
Slide 9
Slide 9 text
͜ͷίϯϙʔωϯτʹcallbackͱͯؔ͠Λͯ͠ɺ
ViewControllerͰॲཧͰ͖ΔΑ͏ʹ͠·͢ɻ
final class ViewController: UIViewController {
@IBOutlet private var component: MyComponent!
override func viewDidLoad() {
super.viewDidLoad()
component.callback = {
ͳΜ͔ॲཧΛ͢Δ()
}
}
deinit { print("deinit") }
}
9
Slide 10
Slide 10 text
final class ViewController: UIViewController {
@IBOutlet private var component: MyComponent!
override func viewDidLoad() {
super.viewDidLoad()
component.callback = {
ͳΜ͔͍ॲཧ()
if something.isͳΜͨΒ {
ଞͷ͍ॲཧ()
} else {
something.΄͛΄͛()
}
}
}
deinit { print("deinit") }
}
! callbackͷத͕ΒΜͰ͖ͨ
10
Slide 11
Slide 11 text
final class ViewController: UIViewController {
@IBOutlet private var component: MyComponent!
override func viewDidLoad() {
super.viewDidLoad()
component.callback = {
self.doHogehoge()
}
}
private func doHogehoge() { ... }
deinit { print("deinit") }
}
☺ ϝιουʹΓग़ͯ͠ɺ͖ͬ͢Γ
11
Slide 12
Slide 12 text
!…ͯΑʁ
component.callback = {
self.doHogehoge()
}
!Ϋϩʔδϟͷதʹself͕ొ͢Δ߹ɺ॥
ࢀরʹؾΛ͚ͭΔඞཁ͕͋ΔΜͩͬͨͳ…ʁ
12
Slide 13
Slide 13 text
!॥ࢀর
self ➡ self.component
self.component ➡ self.component.callback
self.component.callback ➡ self
ɹ
let closure = {
//Ϋϩʔδϟ͕selfΛڧࢀরͰΩϟϓνϟ͍ͯ͠Δ
self.ʙʙʙ
}
13
Slide 14
Slide 14 text
! ͳΒ͜ΕͰ…
component.callback = { [weak self] in
self?.doHogehoge()
}
! ऑࢀরʹͯ͠ɺ᠘Λ՚ྷʹճආʂ
14
Slide 15
Slide 15 text
final class ViewController: UIViewController {
@IBOutlet private var component: MyComponent!
override func viewDidLoad() {
super.viewDidLoad()
component.callback = { [weak self] in
self?.doHogehoge()
}
}
private func doHogehoge() {
// ...
}
deinit { print("deinit") }
}
ɹ
☺ ͖ͬ͢ΓΞήΠϯ
15
Slide 16
Slide 16 text
... {
...
component.callback = { [weak self] in
self?.doHogehoge()
}
}
private func doHogehoge() {
// ...
}
! ͍ɺͰͯΑ…
ɹ ͜ͷΫϩʔδϟɺແବ͡Όͳ͍͔ʁ
16
Slide 17
Slide 17 text
! ͦ͏ͩɺSwiftͰ
ɹ ؔୈҰڃΦϒδΣΫτͩ
final class MyComponent: UIView {
var callback: (() -> Void)?
}
final class ViewController: UIViewController {
private func doHogehoge() {
}
! ͦͯ͠ϝιου doHogehoge
ɹ ϓϩύςΟ callback ͱಉ͡ ()->Void ܕ
ɹ ͱ͍͏͜ͱ…
17
Slide 18
Slide 18 text
ɹ
ɹ
component.callback = doHogehoge
ɹ
! …͜Εͩʂ
18
Slide 19
Slide 19 text
final class ViewController: UIViewController {
@IBOutlet private var component: MyComponent!
override func viewDidLoad() {
super.viewDidLoad()
component.callback = doHogehoge // !
}
private func doHogehoge() {
// ...
}
deinit { print("deinit") }
}
! ܕ߹ͬͯΔʂ
ɹ ͜ͷॻ͖ํ…coool͡Όͳ͍!?
ɹ doHogehogeͷதͰselfͬͯͳ͍͠ʂ
19
Slide 20
Slide 20 text
ͱࢥͬͨΒɺҧͬͨ
20
Slide 21
Slide 21 text
deinit { print("deinit") }
! deinitɺݺΕͯͳ͍ΜͰ͚͢Ͳʂʂ
21
Slide 22
Slide 22 text
!॥ࢀরͷग़དྷ্͕Γ
self ➡ self.component
self.component ➡ self.doHogehogeϝιου
self.doHogehogeϝιου ➡ self
ɹɹɹɹɹɹɹɹɹɹɹɹɹ "!?
22
Slide 23
Slide 23 text
ϝιου҉తʹ
selfͷڧࢀরΛ
͍࣋ͬͯΔ
23
Slide 24
Slide 24 text
ϝιου͕functionܕ
͔ͩΒͱݴͬͯɺ
ܰʹଞͷܕʹͯ͠
ॴ༗͍͚ͤͯ͞ͳ͍
24
Slide 25
Slide 25 text
͜͜Ͱ
ಥવͷΫΠζʂ
25
Slide 26
Slide 26 text
͜Ε͔Βɺ͍Ζ͍ΖͳfunctionܕΛɺ͍Ζ͍ΖͳܗͰ
component.callback ϓϩύςΟʹ͠·͢ɻ
ָ͠Έํ
·ͣɺίʔυΛఏࣔ͠·͢ɻ
ఏࣔ͞Εͨίʔυ͕॥ࢀরΛى͔͜͢ɺͬ͘͡Γߟ͑
ͯΈ·͠ΐ͏ɻ
ϖʔδΛΊ͘Ε͑߹Θͤɻ
݁Ռʢ ݈શ! or ॥ࢀর" ʣ͕͔Γ·͢ɻ
ΫΠζؾͰઓͯ͠Έ͍ͯͩ͘͞Ͷɻ
26
Slide 27
Slide 27 text
ݕূ༻ϓϩδΣΫτ
https://github.com/
takasek/
RecursiveReferenceSample
projectΛϏϧυͯ͠ɺࣗͰ
ಈ͔ͯ͠Έָ͍͔ͯ͠͠
Ε·ͤΜɻ
27
Slide 28
Slide 28 text
here we go!
28
Slide 29
Slide 29 text
ϝιου
final class ViewController: UIViewController {
private func doHogeMethod() {
print("method")
}
func configureButtonAction() {
component.callback = doHogeMethod
}
}
݁Ռ…
29
Slide 30
Slide 30 text
ϝιου
final class ViewController: UIViewController {
private func doHogeMethod() {
print("method")
}
func configureButtonAction() {
component.callback = doHogeMethod
}
}
݁Ռ: ॥ࢀর!
30
Slide 31
Slide 31 text
ϝιου([unowned self]ͳΫϩʔδϟ͔ΒݺͿ)
final class ViewController: UIViewController {
private func doHogeMethod() {
print("method")
}
func configureButtonAction() {
component.callback = { [unowned self] in
self.doHogeMethod()
}
}
}
݁Ռ…
31
Slide 32
Slide 32 text
ϝιου([unowned self]ͳΫϩʔδϟ͔ΒݺͿ)
final class ViewController: UIViewController {
private func doHogeMethod() {
print("method")
}
func configureButtonAction() {
component.callback = { [unowned self] in
self.doHogeMethod()
}
}
}
݁Ռ: ݈શ!
32
Slide 33
Slide 33 text
functionܕϓϩύςΟ
final class ViewController: UIViewController {
let functionTypeProperty = {
print("function-type property")
}
func configureButtonAction() {
component.callback = functionTypeProperty
}
}
݁Ռ…
33
Slide 34
Slide 34 text
functionܕϓϩύςΟ
final class ViewController: UIViewController {
let functionTypeProperty = {
print("function-type property")
}
func configureButtonAction() {
component.callback = functionTypeProperty
}
}
݁Ռ: ݈શ!
34
Slide 35
Slide 35 text
functionܕϓϩύςΟ(தͰselfΛ͏)
final class ViewController: UIViewController {
let functionTypePropertyUsingSelf = {
print("function-type property using self", self)
}
func configureButtonAction() {
component.callback = functionTypePropertyUsingSelf
}
}
݁Ռ…
35
Slide 36
Slide 36 text
functionܕϓϩύςΟ(தͰselfΛ͏)
final class ViewController: UIViewController {
let functionTypePropertyUsingSelf = {
print("function-type property using self", self)
}
func configureButtonAction() {
component.callback = functionTypePropertyUsingSelf
}
}
݁Ռ: ݈શ!
36
Slide 37
Slide 37 text
let functionTypePropertyUsingSelf = {
print("function-type property using self", self)
}
func configureButtonAction() {
component.callback = functionTypePropertyUsingSelf
}
ɹ
!ͬͯͬͯɺ͜ΕϚδͰ॥ࢀরى͖ͳ͍ͷ!?
ͬͯͳΓ·͢ΑͶɻ
ϚδͰ͢ɻ
37
Slide 38
Slide 38 text
ؾΛऔΓͯ͠ɻ
͜͜·ͰclassΠϯελϯεͷϝϯόฤͰ͕ͨ͠ɺ
͔͜͜ΒϩʔΧϧείʔϓฤͰ͢ɻ
func configureButtonAction()
ͷதͰؔΛ࡞Δύλʔϯɻ
38
Slide 39
Slide 39 text
ϩʔΧϧfunction
final class ViewController: UIViewController {
func configureButtonAction() {
func localFunc() {
print("local func")
}
component.callback = localFunc
}
}
݁Ռ…
39
Slide 40
Slide 40 text
ϩʔΧϧfunction
final class ViewController: UIViewController {
func configureButtonAction() {
func localFunc() {
print("local func")
}
component.callback = localFunc
}
}
݁Ռ: ݈શ!
40
Slide 41
Slide 41 text
ϩʔΧϧfunction(தͰselfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
func localFuncUsingSelf() {
print("local func using self", self)
}
component.callback = localFuncUsingSelf
}
}
݁Ռ…
41
Slide 42
Slide 42 text
ϩʔΧϧfunction(தͰselfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
func localFuncUsingSelf() {
print("local func using self", self)
}
component.callback = localFuncUsingSelf
}
}
݁Ռ: ॥ࢀর!
42
Slide 43
Slide 43 text
ϩʔΧϧΫϩʔδϟ
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosure = {
print("local closure")
}
component.callback = localClosure
}
}
݁Ռ…
43
Slide 44
Slide 44 text
ϩʔΧϧΫϩʔδϟ
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosure = {
print("local closure")
}
component.callback = localClosure
}
}
݁Ռ: ݈શ!
44
Slide 45
Slide 45 text
ϩʔΧϧΫϩʔδϟ(தͰselfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosureUsingSelf = {
print("local closure using self", self)
}
component.callback = localClosureUsingSelf
}
}
݁Ռ…
45
Slide 46
Slide 46 text
ϩʔΧϧΫϩʔδϟ(தͰselfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosureUsingSelf = {
print("local closure using self", self)
}
component.callback = localClosureUsingSelf
}
}
݁Ռ: ॥ࢀর!
46
Slide 47
Slide 47 text
ϩʔΧϧΫϩʔδϟ(தͰunowned selfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosureUsingUnownedSelf = { [unowned self] in
print("local closure using unowned self", self)
}
component.callback = localClosureUsingUnownedSelf
}
}
݁Ռ…
47
Slide 48
Slide 48 text
ϩʔΧϧΫϩʔδϟ(தͰunowned selfΛ͏)
final class ViewController: UIViewController {
func configureButtonAction() {
let localClosureUsingUnownedSelf = { [unowned self] in
print("local closure using unowned self", self)
}
component.callback = localClosureUsingUnownedSelf
}
}
݁Ռ: ݈શ!
48
Slide 49
Slide 49 text
͜͜·Ͱͷ·ͱΊ
» ݈શ!ͳύλʔϯ
» ϝιου([unowned self]ͳΫϩʔδϟ͔ΒݺͿ)
» functionܕϓϩύςΟ
» functionܕϓϩύςΟ(தͰselfΛ͏)
» ϩʔΧϧfunction
» ϩʔΧϧΫϩʔδϟ
» ϩʔΧϧΫϩʔδϟ(தͰunowned selfΛ͏)
» ॥ࢀর"͕ى͜Δύλʔϯ
» ϝιουΛ͢
» ϩʔΧϧfunction(தͰselfΛ͏)
» ϩʔΧϧΫϩʔδϟ(தͰselfΛ͏)
49
Slide 50
Slide 50 text
͞Βʹ·ͱΊ
» ΫϩʔδϟɺதͰΘΕΔreference typeΛڧࢀরΩϟϓν
ϟ͢Δ
» unowned, weakΛ͑ڧࢀরΩϟϓνϟආ͚ΒΕΔ
» classΠϯελϯε͕࣋ͭϝιουɺselfͷࢀরΛ࣋ͭ
» classΠϯελϯε͕࣋ͭfunctionܕϓϩύςΟɺselfΛڧࢀ
র͠ͳ͍
» தͰselfΛ͏functionܕϓϩύςΟͰ͢ΒɺselfΛڧࢀর
͠ͳ͍
» Կނ…!?
50
Slide 51
Slide 51 text
> தͰselfΛ͏functionܕϓϩύςΟͰ͢ΒɺselfΛڧ
ࢀর͠ͳ͍
…ຊʹʁ
51
Slide 52
Slide 52 text
let functionTypePropertyUsingSelf = {
print("function-type property using self", self)
}
self…?
52
Slide 53
Slide 53 text
53
Slide 54
Slide 54 text
print("function-type property using self", self)
ͷ݁Ռ
(Function) …ͩͱ…!?
54
Slide 55
Slide 55 text
functionܕϓϩύςΟ(தͰselfΛ͏)
…Λ͏ҰΑ͘Α͘ݟͯΈΔͱɺ
final class ViewController: UIViewController {
let functionTypePropertyUsingSelf = {
print("function-type property using self", self)
}
}
! ͜ͷfunction͕࡞ΒΕΔ࣌ʹɺ
ɹ self( ViewController )ͬͯ·ͩଘࡏͯ͠ͳ͘ͳ͍ʁ
ɹ ଘࡏ͠ͳ͍ͷɺࢀরͰ͖ͳ͍ΑͶʁ
55
Slide 56
Slide 56 text
ͪͳΈʹɺ
͜ͷselfΛऑࢀরΩϟϓνϟ͠Α͏ͱ͢Δͱ…
final class ViewController: UIViewController {
let functionTypePropertyUsingSelf = { [weak self] in
print("function-type property using self", self)
}
}
ऑࢀরʹͰ͖Δͷɺ
classܕɺ͋Δ͍classܕઐ༻ͷϓϩτίϧ͚ͩɻ
self ViewController ܕͷΠϯελϯεͰͳ͍ͷͰɺ
ऑࢀরΩϟϓνϟෆՄೳͬͯ͜ͱͰ͢Ͷɻ
56
Slide 57
Slide 57 text
The Swift Programming Language (Swift 3):
Closures ΑΓ
Closure expressions are unnamed closures written in a
lightweight syntax that can capture values from their
surrounding context.
surrounding contextͬͯͷɺͦ͏͍͏͜ͱ
ʢͩͱࢥ͏ʣɻ
57
Slide 58
Slide 58 text
͞ΒʹͪͳΈʹɺ
pure swiftͳclass (=NSObjectͷαϒΫϥεͰͳ͍)
ͩͱ……
selfଘࡏࣗମɺͯ͠ͳ͍ʂ
58
Slide 59
Slide 59 text
·ͱΊʢશ൛ʣ
» ΫϩʔδϟɺதͰΘΕΔreference typeΛڧࢀ
রΩϟϓνϟ͢Δ
» unowned, weakΛ͑ڧࢀরΩϟϓνϟආ
͚ΒΕΔ
» classΠϯελϯε͕࣋ͭϝιουɺself(classΠ
ϯελϯε)ͷڧࢀরΛ࣋ͭɻ͠Όʔͳ͍ɻ
» classΠϯελϯεͷfunctionܕϓϩύςΟͰɺͦ
ͦself ≠ ॴ༗͍ͯ͠ΔclassΠϯελϯεࣗ
59