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ΑΓΑ͍
ωʔϛϯάΛࢦͯ͠
by.
2017/10/3 Զίϯ Vol.1 / Day.2
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takasek
iOS Developer
@takasek
OSS
ActionClosurable
Notifwift
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ͦ͜·Ͱໃ६͠ͳͯ͘…
ͬͯ·ͤΜ͔ʁ
4 update() Ͱಛఆͷ݅Ͱupdateͤͣʹ
Δ
4 fetch() ͱ͍͍ͭͭUIͷߋ৽ͯ͠Δ
4 ໊લʹࠔͬͯ func didReceive(hoge: Hoge)
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ໃ६ίʔυΛ
ͦͷ··ʹͯ͠͠·͏ཧ༝
4 ΊΜͲ͍͘͞
4 ಈ͍͍ͯΔίʔυʹ৮Γͨ͘ͳ͍
4 దͳ໊લ͕ࢥ͍͔ͭͳ͍
4 ·͋ɺશମΛಡΊཧղͰ͖Δ
4 ผʹόά͡Όͳ͍
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ͰɺωʔϛϯάΛ
ͦͷ··ʹ
͓ͯ͘͠ͱ…
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1
1 ετϧʔϓޮՌ - Wikipediaɹhttps://ja.wikipedia.org/wiki/
%E3%82%B9%E3%83%88%E3%83%AB%E3%83%BC%E3%83%97%E5%8A%B9%E6%9E%9C
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ໃ६ίʔυ
ίʔυϦʔσΟϯάΛ
͘͢Δ
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ͬͱةݥͳͷɺ
ؔͳ͍ॲཧ͕ೖΓࠐΉ
伱͕Ͱ͖Δ
4 ܕϝιουͷͷൣғ͕ఆ·Βͳ͍
4 ܕϝιου͕ංେԽ͢Δɾॲཧ͕֤ॴʹࢄ
͢Δ
4 ࠷ѱɺόά͕ࠐ·ΕΔ
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4 update() Ͱಛఆͷ݅Ͱupdateͤͣʹ
Δ
4 σʔλߋ৽ޙը໘ߋ৽͞Εͳ͍…
ͱࢥͬͨΒॲཧ్͕தͰguard͞Εͯͨ !
4 fetch() ͱ͍͍ͭͭUIͷߋ৽ͯ͠Δ
4 ࢥΘ͵࣌ʹදࣔ͞ΕΔAlert ⚠
4 ໊લʹࠔͬͯ func didReceive(hoge: Hoge)
4 isFetching: Bool ͷཧՕॴ͕ࢄʂ #
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໊લ͕;Θͬͱͯ͠Δ͔Β
༨ܭͳ͜ͱΛͯ͠͠·͏
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Α໊͍લΛ
͚ͭΑ͏✨
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ͰɺͲ͏ͬͯʁ
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ʮ໊લʹใΛ٧ΊࠐΉʯ 2
1. ໌֬ͳ୯ޠΛબͿ
2. ൚༻తͳ໊લΛආ͚Δʢ͋Δ͍
ɺ͏ঢ়گΛબͿʣ
3. நతͳ໊લΑΓ۩ମతͳ໊લ
Λ͏
4. ඌࣙ಄ࣙΛͬͯใΛ
Ճ͢Δ
5. ໊લͷ͞ΛܾΊΔ
6. ໊લͷϑΥʔϚοτͰใΛ͑Δ
2 ʮϦʔμϒϧίʔυʯDustin Boswell, Trevor
Foucher, 2012 P10
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ʮ໊લʹใΛ٧ΊࠐΉʯᶃ
໌֬ͳ୯ޠΛબͿ
4 ❌ HogeStorage.set(fuga)
⭕ HogeStorage.store(fuga)
4 ❌ RxSwift.Observable
⭕ RxSwift.Single as you can!
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ʮ໊લʹใΛ٧ΊࠐΉʯᶃ
໌֬ͳ୯ޠΛબͿ
❌
employees.remove(x)
view.dismiss(false)
let text = words.split(12)
⭕
employees.remove(at: x)
view.dismiss(animated: false)
let text = words.split(maxSplits: 12)
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ʮ໊લʹใΛ٧ΊࠐΉʯᶄ
൚༻తͳ໊લΛආ͚Δ
ʢ͋Δ͍ɺ͏ঢ়گΛબͿʣ
❌
final class HogeViewController {
private let margin: CGFloat = 2.0
private let defaultSize = CGSize(width: 100, height: 50)
...
}
!ԿͷϚʔδϯͱαΠζͶΜ
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ʮ໊લʹใΛ٧ΊࠐΉʯᶄ
൚༻తͳ໊લΛආ͚Δ
ʢ͋Δ͍ɺ͏ঢ়گΛબͿʣ
⭕
func calculateComponentWidth
(paralleling contentSizes: [CGSize]) -> CGFloat {
return contentSizes.reduce(margin) { result, size in
let margin: CGFloat = 2
result + size.width + margin
}
}
!Ͱ͜ΕͳΒڐͤΔɻείʔϓ͕ڱ͍ͷͰɻ
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ʮ໊લʹใΛ٧ΊࠐΉʯᶄ
൚༻తͳ໊લΛආ͚Δ
ʢ͋Δ͍ɺ͏ঢ়گΛબͿʣ
⭕
var userID: Int? {
switch self.userState {
case .id(id): return id
case .entity(e): return e.id
case .unavailable: return nil
}
}
͋͑ͯࡶͳ໊લΛ͚ͭͯʮҰ࣌తͳͷʯͩͱࣔ͢
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ʮ໊લʹใΛ٧ΊࠐΉʯᶅ
நతͳ໊લΑΓ
۩ମతͳ໊લΛ͏
❌
class HogeListViewController : UIViewController {
...
func fetch()
func fetchBackground()
func fetchReally(_ id: String, show: Bool)
...
}
ͲΕ͕Ͳ͏͍͏ׂʁ!
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class HogeListViewController : UIViewController {
/// ௨৴ͯ͠ɺࣦഊͨ͠ΒΞϥʔτΛදࣔ͢Δ
func fetch() {
fetchReally(textField.text!, show: true)
}
/// ௨৴ͯ͠ɺࣦഊͯ͠Ξϥʔτදࣔ͠ͳ͍
func fetchBackground() {
fetchReally(textField.text!, show: false)
// !Ͳ͏ΒʮΞϥʔτΛදࣔ͠ͳ͍ʯ͔Βbackgroundͱ͍͏Β͍͠ɻӕͩΖ!?
}
func fetchReally(_ id: String, show: Bool) {
api.fetch(id) { [weak self] models in
self?.didReceive(models: models, showsAlertIfFailed: show)
}
// !ʮ۩ମతͳ௨৴ॲཧ͕ॻ͍ͯ͋Δʯ͔Βreallyͱ͍͏Β͍͠
}
}
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ʮ໊લʹใΛ٧ΊࠐΉʯᶅ
நతͳ໊લΑΓ
۩ମతͳ໊લΛ͏
❌
func fetch()
func fetchBackground()
func fetchReally(_ id: String, show: Bool)
⭕
func startFetchingHogesWithFailureAlert()
func startFetchingHogesWithoutFailureAlert()
func fetchHoges(withID id: String, showsAlertIfFailed: Bool)
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ʮ໊લʹใΛ٧ΊࠐΉʯᶆ
ඌࣙ಄ࣙΛͬͯ
ใΛՃ͢Δ
❌
let text1 = "100%25%E5%8B%87%E6%B0%97"
let text2 = text1.removingPercentEncoding! // "100%༐ؾ"
let text3 = text2.removingPercentEncoding! // CRASH"
⭕
let encodedText = "100%25%E5%8B%87%E6%B0%97"
let decodedText = encodedText.removingPercentEncoding! // "100%༐ؾ"
// ͏$decodeࡁΈͩͱΘ͔Δ
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ʮ໊લʹใΛ٧ΊࠐΉʯᶇ
໊લͷ͞ΛܾΊΔ
໊͍લͷೖྗࣗମ͡Όͳ͍ɻίʔυิ͕͋
Δ͔Βɻ
!লུܗʢbackend→beͱ͔ʣΘΒͳ͍͔Βආ͚Δɻ
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ʮ໊લʹใΛ٧ΊࠐΉ¥ʯᶇ
໊લͷ͞ΛܾΊΔ
Ͱɺෆཁͳ୯ޠࣺ͛ͯΔɻʢSwift3 ࣺ͛ͯࡇΓͰͨ͠Ͷʂʣ
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ʮ໊લʹใΛ٧ΊࠐΉʯᶈ
໊લͷϑΥʔϚοτͰใΛ͑Δ
SwiftͰݴ͑…
4 େจࣈ࢝·Γܕ໊ɺͦΕҎ֎খจࣈ࢝·Γ
4 ΞϯμʔείΞ࢝·ΓͷAPIpublicͳͷͰ
ͳ͍
ྫ: _kvcKeyPathString
https://bugs.swift.org/browse/SR-5220
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Ҏ্͕ʮ໊લʹใΛ٧ΊࠐΉʯ
Ͱͨ͠
1. ໌֬ͳ୯ޠΛબͿ
2. ൚༻తͳ໊લΛආ͚Δʢ͋Δ͍ɺ͏ঢ়گΛબͿʣ
3. நతͳ໊લΑΓ۩ମతͳ໊લΛ͏
4. ඌࣙ಄ࣙΛͬͯใΛՃ͢Δ
5. ໊લͷ͞ΛܾΊΔ
6. ໊લͷϑΥʔϚοτͰใΛ͑Δ
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ʮϦϑΝΫλϦϯάʯ
͍͍͜ͱݴͬͯͨ
"ϝιου໊ʹɺ෦ͰͲͷ
Α͏ʹॲཧΛ͍ͯ͠Δ͔Ͱͳ
͘ɺͦͷίʔυ͕ԿΛ͢Δͷ
͔ͱ͍͏ҙਤΛࣔ͠·͢ɻ"4
4 ʮ৽൛ɹϦϑΝΫλϦϯάɹطଘͷίʔυΛ҆શ
ʹվળ͢Δʯ2014 P77
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Swift ͷ API design guideline ʹै͏
https://swift.org/documentation/api-design-guidelines/#naming
4 ྲྀெͳӳจʹݟ͑ΔΑ͏ʹ
4 มɾҾɾଐܕͷωʔϛϯάɺͦͷ੍ΑΓׂʹԠͯ͡ߦ͏
4 ϝιου໊ͷࢺΛɺ෭࡞༻͋Δͳ͠ͰมԽͤ͞Δ
4 ෭࡞༻ͳ͠: ໊ࢺɺಈࢺͷաڈࢺɺݱࡏࢺΛ͏
4 e.g. array.sorted
4 ෭࡞༻͋Γ: ಈࢺͷ໋ྩܗΛ͏ɻ͋Δ͍ form Λ಄ʹ͚ͭΔ
4 e.g. array.sort ɹ/ɹ y.formUnion()
4 લྫΛ࠾༻͠·͠ΐ͏
4 etc...
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Swift Foundation / Cocoaͷྲّྀʹ
ै͏
API design guidelineͷ "લྫΛ࠾༻͠·͠ΐ͏" Λ࠾༻͠·͠ΐ͏
4 Bool ܕ isʙ ɺcanʙ ɺneedsʙ ͳͲͰ࢝·Δ
4 delegate ϝιουͷ໊͚ํ
4 ❌ func willBlog(_ blog: Blog)
⭕ func atendeeWillBlog(_ blog: Blog)
4 APIΛશମݕࡧͰ͖ΔΑ͏ʹ͓ͯ͘͠ͱศར
4 https://developer.apple.com/search/?q={query}
&type=Reference
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ͦͦ
దͳωʔϛϯά͕
Ͱ͖ͳ͍ྫ͋Δ
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class HogeListViewController : UIViewController {
...
func startFetchingHogesWithFailureAlert() {
fetchHoges(withID: textField.text!,
showsAlertIfFailed: true)
}
func startFetchingHogesWithoutFailureAlert() {
fetchHoges(withID: textField.text!,
showsAlertIfFailed: false)
}
func fetchHoges(withID id: String,
showsAlertIfFailed: Bool) {
api.fetchHoges(withID: id) { [weak self] hoges in
self?.didReceive(
hoges: hoges,
showsAlertIfFailed: showsAlertIfFailed
)
}
}
...
}
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దͳωʔϛϯά͕Ͱ͖ͳ͍ྫᶃ
ඇಉظॲཧ
func fetchHoges(withID id: String,
showsAlertIfFailed: Bool) {
api.fetchHoges(withID: id) { [weak self] hoges in
self?.didReceive(
hoges: hoges,
showsAlertIfFailed: showsAlertIfFailed
)
}
}
!fetchޙͷྃॲཧ୲͍ͬͯΔΜ͔ͩΒɺ
ɹfetch ͬͯϝιου໊͚ͩͰ͓͔͘͠ͳ͍ʁ
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ߏԽϓϩάϥϛϯάͷେݪଇ
ϝιου
ೖޱ(Ҿ) ͱ ग़ޱ(Γ) Λ࣋ͭ
͔͠͠ඇಉظॲཧͷ݁Ռ
Γ ʹө͞Εͳ͍
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Ҿ͔ΓͰ
ඇಉظॲཧ݁ՌΛड͚ΒΕΔ
σβΠϯύλʔϯΛ͓͏
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దͳωʔϛϯά͕Ͱ͖ͳ͍ྫᶃ
ඇಉظॲཧ
ඇಉظॲཧ callback Promiseύλʔϯ Λͬͯ
Α͏͘ਖ਼͘͠ݴ͍දͤΔ
!
func fetchHoges(withID id: String, showsAlertIfFailed: Bool)
"callback
func fetchHoges(withID id: String, completion: ([Hoge] -> Void))
#promise
func fetchHoges(withID id: String) -> RxSwift.Single<[Hoge]>
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దͳωʔϛϯά͕Ͱ͖ͳ͍ྫᶄ
ʁʁʁʁʁʁʁʁʁ
func postProfileWith(name: String?,
address: String?,
tel: String?,
profileImage: UIImage?,
profileImageURL: URL?)
-> RxSwift.Single
γϯϓϧͰ͔Γ͍͢ϝιου໊…
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దͳωʔϛϯά͕Ͱ͖ͳ͍ྫᶄ
ʁʁʁʁʁʁʁʁʁ
func postProfileWith(name: String?,
address: String?,
tel: String?,
profileImage: UIImage?,
profileImageURL: URL?)
-> RxSwift.Single
γϯϓϧͰ͔Γ͍͢ϝιου໊…
ͬͯɺຊʁ
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దͳωʔϛϯά͕Ͱ͖ͳ͍ྫᶄ
Ҿͷදݱྗ͕ऑ͍
func postProfileWith(name: String?,
address: String?,
tel: String?,
profileImage: UIImage?,
profileImageURL: URL?)
-> RxSwift.Single
4 Optional͔Γ͚ͩͲɺඞਢύϥϝʔλԿͳͷ͔
4 tel ☎ Ͳ͏͍͏ϑΥʔϚοτͰจࣈྻԽ͢Ε͍͍ͷ͔
4 Կނ profileImage ͱ profileImageURL ͕྆ํ͋Δͷ͔ɻͲͪ
Βͨ͠Βɺ͋Δ͍ͲͪΒ͞ͳ͔ͬͨΒͲ͏ͳΔͷ͔ɻ
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Ҿωʔϛϯάͷ
(Γ)
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ҾͷදݱྗΛߴΊΔ
func postProfileWith(name: String?,
address: String?,
tel: String?,
profileImage: UIImage?,
profileImageURL: URL?)
-> RxSwift.Single
ɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹ!
func postProfileWith(textData: ProfileTextData?,
imageData: ProfileImageData)
-> RxSwift.Single
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// ͯ͢ͷཁૉ͕ඞཁͳ߹ (AND) struct ͰදݱͰ͖Δ
struct ProfileTextData {
let name: String
let address: String
let tel: Tel?
}
// ͍ͣΕ͔ͷཁૉ͕ඞཁͳ߹ (OR) enum ͰදݱͰ͖Δ
enum ProfileImageData {
case image(UIImage)
case url(URL)
}
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ҾͷදݱྗΛߴΊΔ
func postProfileWith(textData: ProfileTextData?,
imageData: ProfileImageData)
-> RxSwift.Single
4 ProfileTextData (name & address & tel?)
4 ἧ͑ͯ͢ or શεϧʔ
4 ProfileImageData (UIImage | URL)
4 ͍ͣΕ͔Λ͢
ͳΔ΄Ͳʂ!
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దͳ໊લΛߟ͑Δ
⊃
ઃܭͷݟ͠
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= ϦϑΝΫλϦϯά
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ਖ਼໊͚͘͠Α͏ͱ͢Δͱ
ϝιουͷ໊લ͕
ͨΒ͔ͬͨΓ΅ΜΓ͢Δ!
→❌
ෆਖ਼֬Ͱ
͘ཁͪ͠Ό͓͏"
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ਖ਼໊͚͘͠Α͏ͱ͢Δͱ
ϝιουͷ໊લ͕
ͨΒ͔ͬͨΓ΅ΜΓ͢Δ!
→⭕
ϝιουͷׂ͕େ͖͗͢
ͭ·ΓϦϑΝΫλϦϯά͕
ඞཁͩͱ͍͏αΠϯͩʂ"
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ʮϝιουΦϒδΣΫτʯ
ϝιουࣗ → ໊ࢺԽͯ͠ܕ(ΦϒδΣΫτ) ʹ
શͯͷϩʔΧϧม → ܕͷϓϩύςΟ ʹ
ϝιου → ܕͷϝιου܈ ʹ
class ProfilePoster {
let textData: ProfileTextData?
let imageData: ProfileImageData
func run() -> RxSwift.Single
private func ...
}
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ʮಛੑͷԣ࿀ูʯ
ʢ͋Δϝιου͕ɺࣗͷΫϥεΑΓଞͷΫϥεʹڵຯΛ࣋ͭʯঢ়ଶʣ
❌
class ProfilePoster {
...
private func isTelValid(tel: String) -> Bool {
return (try! NSRegularExpression(pattern: "^[0-9]+-[0-9]+-[0-9]+$"))
.firstMatch(in: tel,
range: NSRange(
location: 0,
length: (tel as NSString).length
)) != nil
}
}
※isTelValid(tel:) ͷڵຯ ʮϓϩϑΟʔϧͷฤूը໘ʯͰͳ͘ʮ☎ి൪߸ʯ
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ʮಛੑͷԣ࿀ูʯ
ʢ͋Δϝιου͕ɺࣗͷΫϥεΑΓଞͷΫϥεʹڵຯΛ࣋ͭʯঢ়ଶʣ
☎͕ڵຯͷத৺Ͱ͋ΔܕΛ࡞Γɺ isTelValid(tel:) ΛҠಈ
⭕
struct Tel {
let value: String
var isValid: Bool {
return try! value.matches(pattern: "^[0-9]+-[0-9]+-[0-9]+$")
// ※ String.matches(pattern:) String ʹੜͨ͠ extension
}
}
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ओޠͱͳΔܕʹॲཧΛୗ͢͜ͱͰɺ
໌ྎ؆ܿͳωʔϛϯάʹͳΔ
!before!
ProfilePoster.isTelValid(tel: String) -> Bool
"after"
Tel.isValid: Bool
4 ॲཧର͕selfͱͳΔ
4 ϝιουج෦ʹॻ͍͍ͯͨॲཧରΛɺܕ͕ࣗઆ໌ͯ͘͠Ε
Δ
4 ॲཧରΛ͋ΒΘ͢Ҿফ͑Δ
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ͪͳΈʹ
Tel.isValid: Bool ΑΓྑ͍ઃܭ:
init࣌ʹόϦσʔτͯ͠ɺͦͦෆਖ਼ͳ Tel ܕ
Λ࡞Εͳ͍Α͏ʹ͢Δ
struct Tel {
enum Error: Swift.Error {
case invalidFormat
}
let value: String
init(value: String) throws {
guard try value.matches(pattern: "^[0-9]+-[0-9]+-[0-9]+$") else {
throw Error.invalidFormat
}
self.value = value
}
}
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ܕ
ʹඋΘΔදݱྗ!
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ΦϒδΣΫτࢦͰॻ͘ݶΓ
ϝιουϓϩύςΟ
ԿΒ͔ͷܕͷ
ϝϯό
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ΑΓྑ͍ωʔϛϯάͷͨΊʹ
"ԿΛ͢Δ/ԿͰ͋Δ" ͚ͩͰͳ͘
"୭͕/୭ͷ" Λҙࣝ͢Δ
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Happy Naming!!
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͓·͚
ΑΓ๛͔ͳ
ωʔϛϯάͷͨΊʹ
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returns Optional vs throws
struct Tel {
enum Error: Swift.Error {
case invalidFormat
}
let value: String !
init(value: String) throws {
guard try value.matches(pattern: "^[0-9]+-[0-9]+-[0-9]+$") else {
throw Error.invalidFormat
}
self.value = value
}
}
init?(value: String) ͱ͍͏ख͋Δ͚Ͳ…ʁ
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returns Optional vs throws
returns Optional
4 ! ͓खܰ؆୯ʹѻ͑Δ
4 " Ճใ͕͍͠
ྫ֎ॲཧ(throws)
4 !ʮࣦഊ͠͏Δʯ͜ͱΛ໌֬ʹදͤΔ
4 ! try? ߏจͰOptionalʹมՄೳ
4 ! Error Λఆٛͯ͠ࡉ͔ʹࣦഊݪҼΛ͑ΒΕΔ
4 " Error Λఆٛ͢Δඞཁ͕͋Δ
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ݴޠػೳΛۦ͠Α͏
4 ࣗࣗͷܕΛฦ͢static func
4 operator
4 ه߸ʹΑΔॲཧΛఆٛ͢Δ
4 લஔɾதஔɾޙஔ
4 subscript
4 e.g.ɹ reversiBoard[x: 10, y: 8]
4 ෳͷҾɺϥϕϧ༩Մೳ
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ίϚϯυɾΫΤϦݪଇ
(CQRS)
4 ίϚϯυʢΓͳ͠ɺ෭࡞༻Λى͜͢ʣ
4 ΫΤϦʢΓΛظɺԿݺΜͰಉ݁͡Ռ(ႈ
)ʣ
Λ͚Δͱઃܭ͕͖ͬ͢Γ͢ΔΑͱ͍͏
var canFetch: Bool
func startFetching(id: Int) -> Void
let hoges: Rx.Observable<[Hoge]>
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Happy Happy
Naming!!
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