Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
面向协议编程与 Cocoa 的邂逅
Search
Wei Wang
September 24, 2016
Technology
14
4.8k
面向协议编程与 Cocoa 的邂逅
My talk in MDCC 16. About using Protocol-Oriented Programming language in daily Cocoa life.
Wei Wang
September 24, 2016
Tweet
Share
More Decks by Wei Wang
See All by Wei Wang
網路之難,難於上青天 - iPlayground 2019
onevcat
11
5.1k
GMTC 2019 - 在分歧中发展,2019 我们能用 Swift 做什么
onevcat
0
1k
从 Swift 到机器学习
onevcat
2
1k
iOS Dev - The Dark Side
onevcat
0
140
Swift 3 - From Expert to Beginner
onevcat
2
220
如何打造一个让人愉快的框架
onevcat
4
22k
JSPatch Introduction
onevcat
0
200
Objective-C Runtime Swizzle
onevcat
0
200
Unity Memory
onevcat
0
150
Other Decks in Technology
See All in Technology
絶対に失敗できないキャンペーンページの高速かつ安全な開発、WINTICKET × microCMS の開発事例
microcms
0
370
進捗
ydah
2
230
ガチな登山用デバイスからこんにちは
halka
1
210
allow_retry と Arel.sql / allow_retry and Arel.sql
euglena1215
1
150
モバイルアプリ研修
recruitengineers
PRO
5
1.7k
バッチ処理で悩むバックエンドエンジニアに捧げるAWS Glue入門
diggymo
3
110
なぜSaaSがMCPサーバーをサービス提供するのか?
sansantech
PRO
6
2k
カミナシ社の『ID管理基盤』製品内製 - その意思決定背景と2年間の進化 #AWSUnicornDay / Kaminashi ID - The Big Whys
kaminashi
3
730
AWSで推進するデータマネジメント
kawanago
0
890
LLM翻訳ツールの開発と海外のお客様対応等への社内導入事例
gree_tech
PRO
0
450
Flutterでキャッチしないエラーはどこに行く
taiju59
0
210
【初心者向け】ローカルLLMの色々な動かし方まとめ
aratako
7
2.8k
Featured
See All Featured
Java REST API Framework Comparison - PWX 2021
mraible
33
8.8k
Building an army of robots
kneath
306
46k
Scaling GitHub
holman
463
140k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4k
It's Worth the Effort
3n
187
28k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
[RailsConf 2023] Rails as a piece of cake
palkan
56
5.8k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
Documentation Writing (for coders)
carmenintech
73
5k
Transcript
ᶎݻܐᦓᖫᑕӨ Cocoa ጱᮁᭊ MDCC 16 ሴ - 2016 ଙ 9
์ 24 ෭
Ԇ᷌ • ᩸ɾॳᦩ • ಥɾ૬ • ɾᅾ • ݳɾജ
Ԇ᷌ • ᩸ɾॳᦩ - Ջԍฎ Swi' ܐᦓ • ಥɾ૬ •
ɾᅾ • ݳɾജ
Ԇ᷌ • ᩸ɾॳᦩ - Ջԍฎ Swi' ܐᦓ • ಥɾ૬ -
ܐᦓಘᶎݻܐᦓᖫᑕ • ɾᅾ • ݳɾജ
Ԇ᷌ • ᩸ɾॳᦩ - Ջԍฎ Swi' ܐᦓ • ಥɾ૬ -
ܐᦓಘᶎݻܐᦓᖫᑕ • ɾᅾ - ࣁ෭ଉݎӾֵአܐᦓ • ݳɾജ
Ԇ᷌ • ᩸ɾॳᦩ - Ջԍฎ Swi' ܐᦓ • ಥɾ૬ -
ܐᦓಘᶎݻܐᦓᖫᑕ • ɾᅾ - ࣁ෭ଉݎӾֵአܐᦓ • Model (Networking) • ViewController • ݳɾജ
᩸ɾॳᦩ Ջԍฎ Swi% ܐᦓ Protocol
protocol Greetable { var name: String { get } func
greet() }
ᶎݻ Object-oriented
ᶎݻ class Animal { var leg: Int { return 2
} func eat() { print("eat food.") } func run() { print("run with \(leg) legs") } } class Tiger: Animal { override var leg: Int { return 4 } override func eat() { print("eat meat.") } } let tiger = Tiger() tiger.eat() // "eat meat" tiger.run() // "run with 4 legs"
ViewController → UIViewController class ViewCotroller: UIViewController { // ᖀಥ //
view, isFirstResponder()... // ෛے func myMethod() { } }
AnotherViewController → UITableViewController → UIViewController class AnotherViewController: UITableViewController { //
ᖀಥ // tableView, isFirstResponder()... // ෛے func myMethod() { } }
ࢯहԏӞ Cross-Cu'ng Concerns ཞڔىဳᅩ
ᥴ٬ොໜ • Copy & Paste • ف BaseViewController • ׁᩢဳف
• ग़ᖀಥ
Objec&ve-C Message Sending
ViewController *v1 = ... [v1 myMethod]; AnotherViewController *v2 = ...
[v2 myMethod];
NSArray *array = @[v1, v2]; for (id obj in array)
{ [obj myMethod]; }
NSObject *v3 = [NSObject new] // v3 ဌํਫሿ `myMethod` NSArray
*array = @[v1, v2, v3]; for (id obj in array) { [obj myMethod]; } // Runtime error: // unrecognized selector sent to instance blabla
ࢯहԏԫ Dynamic Dispatch Safety ۖாၝݎਞق
OOP ࢯह • ۖாၝݎਞق • ཞڔىဳᅩ
ܐᦓ Protocol
Java, C# Interface
Swift protocol
Swi$ protocol protocol Greetable { var name: String { get
} func greet() }
Swi$ protocol protocol Greetable { var name: String { get
} func greet() } struct Person: Greetable { let name: String func greet() { print("֦অ \(name)") } } Person(name: "Wei Wang").greet()
ಥɾ૬ ܐᦓಘᶎݻܐᦓᖫᑕ
OOP ࢯह • ۖாၝݎਞق • ཞڔىဳᅩ
protocol Greetable { var name: String { get } func
greet() } struct Person: Greetable { let name: String func greet() { print("֦অ \(name)") } }
protocol Greetable { var name: String { get } func
greet() } struct Cat: Greetable { let name: String func greet() { print("meow~ \(name)") } }
let array: [Greetable] = [ Person(name: "Wei Wang"), Cat(name: "onevcat")]
for obj in array { obj.greet() } // ֦অ Wei Wang // meow~ onevcat
struct Bug: Greetable { let name: String } // Compiler
Error: // 'Bug' does not conform to protocol 'Greetable' // protocol requires function 'greet()'
OOP ࢯह • ✅ ۖாၝݎਞق • ཞڔىဳᅩ
ֵአܐᦓوՁդᎱ protocol P { func myMethod() }
// class ViewController: UIViewController extension ViewController: P { func myMethod()
{ doWork() } } // class AnotherViewController: UITableViewController extension AnotherViewController: P { func myMethod() { doWork() } }
Swi$ 2 - ܐᦓಘ
protocol P { func myMethod() } extension P { func
myMethod() { doWork() } } ԅ P ਧԎጱොဩ׀ἕᦊਫሿ
extension ViewController: P { } extension AnotherViewController: P { }
viewController.myMethod() anotherViewController.myMethod()
ਫሿ๚ࣁܐᦓӾ्กጱٖ protocol P { func myMethod() } extension P {
func myMethod() { doWork() } func anotherMethod() { myMethod() someOtherWork() } } viewController.anotherMethod()
• ܐᦓਧԎ • ׀ਫሿጱفݗ • ᭽ܐᦓጱᔄࣳᵱᥝٌᬰᤈਫሿ • ܐᦓಘ • ԅفݗ׀ἕᦊਫሿ
• ໑ഝفݗ׀᷐क़ਫሿ
OOP ࢯह • ✅ ۖாၝݎਞق • ✅ ཞڔىဳᅩ
ɾᅾ ࣁ෭ଉݎӾֵአܐᦓ
WWDC 15 #408 Protocol-Oriented Programming in Swi3
Model (Networking)
ໜֺ चԭ Protocol ጱᗑᕶ᧗
Demo • चԭܐᦓ • ᔄࣳਞق • ᥴᘠݳ • ݢܔᇿၥᦶ •
ಘ
• Networking: • AFNetworking • Alamofire • (ASIHTTPRequest) ! •
Model Parser • SwiAyJSON • Argo • Himotoki
սضᘍᡤֵአܐᦓ ṛଶܐᦓ۸ํۗԭᥴᘠ҅ၥᦶզ݊ಘ
APIKit1 + Himotoki2 2 h$ps:/ /github.com/ikesyo/Himotoki 1 h$ps:/ /github.com/ishkawa/APIKit
Controller
ໜֺ ړᶭے
ړᶭےጱᗑᕶ᧗ struct Pagination<T> { let items: [T] let hasNext: Bool
} struct ChannelsResquest: Request { typealias Response = Pagination<Channel> let lastId: Int? }
class ChannelsTableViewController: UITableViewController { private var lastId: Int? = nil
private var hasNext = true override func viewDidLoad() { super.viewDidLoad() load() } func load() { if hasNext { client.send(ChannelsResquest(lastId: lastId)) { result in } } } }
class ChannelsTableViewController: UITableViewController { private var lastId: Int? = nil
private var hasNext = true private var data: [Channel] = [] override func viewDidLoad() { super.viewDidLoad() load() } func load() { if hasNext { client.send(ChannelsResquest(lastId: lastId)) { result in self.lastId = result!.items.last?.id self.hasNext = result!.hasNext self.data = result.items self.tableView.reloadData() } } } }
extension ChannelsTableViewController: UITableViewDelegate { override func tableView(tableView: UITableView, willDisplayCell cell:
UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) { if indexPath.row == data.count - 1 { load() } }
ඳԪᬮဌํᕮ...
ඳԪᬮဌํᕮ... private var isLoading = false func load() { if
isLoading { return } if hasNext { isLoading = true client.send(ChannelsResquest(lastId: lastId)) { result in //... self.isLoading = false } } }
ChannelsTableViewController Pagina&on<Channel>
FriendsTableViewController Pagina&on<Friend>
ොໜӞғ॔ګᔌᩂ
ොໜӞғ॔ګᔌᩂ
ොໜԫғᆿᔄ
BaseTableViewController
class BaseTableViewController: UITableViewController { var lastId: Int? = nil var
hasNext = true var isLoading = false func loadNext() { if isLoading { return } if hasNext { isLoading = true doLoad {result in self.lastId = //... self.hasNext = //... } } } func doLoad(handler: (Any?)->Void) { // ?? } }
class BaseTableViewController: UITableViewController { var lastId: Int? = nil var
hasNext = true var isLoading = false func loadNext() { if isLoading { return } if hasNext { isLoading = true doLoad {result in self.lastId = //... self.hasNext = //... } } } func doLoad(handler: (Any?)->Void) { fatalError("You should implement it in subclass!") } }
class FriendsTableViewController: BaseTableViewController { private var data: [Friend] = []
override func viewDidLoad() { super.viewDidLoad() loadNext() } override func doLoad(handler: (Any?)->Void) { client.send(FriendsRequest(lastId: lastId)) { result in handler(result) // ... self.data = result!.items self.tableView.reloadData() } } }
None
None
WTF?
• FriendsTableViewController → FriendsCollec5onViewController
• FriendsTableViewController → FriendsCollec5onViewController • BaseTableViewController → BaseCollec5onViewController
• FriendsTableViewController → FriendsCollec5onViewController • BaseTableViewController → BaseCollec5onViewController ॔ګᔌᩂ?
• FriendsTableViewController → FriendsCollec5onViewController • BaseTableViewController → BaseCollec5onViewController ॔ګᔌᩂ
ොໜӣғܐᦓ
struct NextPageState<T> { private(set) var hasNext: Bool private(set) var isLoading:
Bool private(set) var lastId: T? init() { hasNext = true isLoading = false lastId = nil } mutating func reset() { hasNext = true isLoading = false lastId = nil } mutating func update(hasNext: Bool, isLoading: Bool, lastId: T?) { self.hasNext = hasNext self.isLoading = isLoading self.lastId = lastId } }
protocol NextPageLoadable: class { associatedtype DataType associatedtype LastIdType var data:
[DataType] { get set } var nextPageState: NextPageState<LastIdType> { get set } func performLoad( successHandler: (_ rows: [DataType], _ hasNext: Bool, _ lastId: LastIdType?) -> (), failHandler: () -> () ) }
protocol NextPageLoadable: class { associatedtype DataType associatedtype LastIdType var data:
[DataType] { get set } var nextPageState: NextPageState<LastIdType> { get set } func performLoad( successHandler: (_ rows: [DataType], _ hasNext: Bool, _ lastId: LastIdType?) -> (), failHandler: () -> () ) } extension NextPageLoadable where Self: UITableViewController { func loadNext() { guard nextPageState.hasNext else { return } if nextPageState.isLoading { return }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { guard
nextPageState.hasNext else { return } if nextPageState.isLoading { return } nextPageState.isLoading = true performLoad(successHandler: { rows, hasNext, lastId in self.data += rows self.nextPageState.update(hasNext: hasNext, isLoading: false, lastId: lastId)
extension NextPageLoadable where Self: UITableViewController { func loadNext() { guard
nextPageState.hasNext else { return } if nextPageState.isLoading { return } nextPageState.isLoading = true performLoad(successHandler: { rows, hasNext, lastId in self.data += rows self.nextPageState.update(hasNext: hasNext, isLoading: false, lastId: lastId) self.tableView.reloadData() }, failHandler: { //.. }) } }
class FriendTableViewController: UITableViewController { var nextPageState = NextPageState<Int>() var data:
[Friend] = [] } extension FriendTableViewController: NextPageLoadable { func performLoad( successHandler: ([String], Bool, Int?) -> (), failHandler: () -> ()) { client.send(FriendsRequest()) { result in if let result = result { successHandler(result.items, result.hasNext, result.items.last.id) } else { failHandler() } } } }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { ...
} }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { ...
} } extension FriendTableViewController: NextPageLoadable { ... } class FriendTableViewController: UITableViewController { //... override func viewDidLoad() { super.viewDidLoad() loadNext() } override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) { if indexPath.row == data.count - 1 { loadNext() } } }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { ...
} } UICollec(onView ெԍېҘ
extension NextPageLoadable where Self: UITableViewController { func loadNext() { ...
} } UICollec(onView ெԍېҘ ॔ګᔌᩂҘ extension NextPageLoadable where Self: UICollectionViewController { func loadNext() { ... } }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { guard
nextPageState.hasNext else { return } if nextPageState.isLoading { return } nextPageState.isLoading = true performLoad(successHandler: { rows, hasNext, lastId in self.data += rows self.nextPageState.update(hasNext: hasNext, isLoading: false, lastId: lastId) self.tableView.reloadData() }, failHandler: { // Failed when first loading if self.nextPageState.lastId == nil { self.data = [] self.nextPageState.reset() } }) } }
tableView.reloadData() colletionView.reloadData()
tableView.reloadData() colletionView.reloadData() protocol ReloadableType { func reloadData() } extension UITableView:
ReloadableType {} extension UICollectionView: ReloadableType {}
extension NextPageLoadable where Self: UITableViewController { func loadNext() { //...
self.tableView.reloadData() //... } }
extension NextPageLoadable { func loadNext(view: ReloadableType) { //... view.reloadData() //...
} }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { loadNext(reloadView:
tableView) } }
extension NextPageLoadable where Self: UITableViewController { func loadNext() { loadNext(reloadView:
tableView) } } extension NextPageLoadable where Self: UICollectionViewController { func loadNext() { loadNext(reloadView: collectionView) } }
• FriendsTableViewController → FriendsCollec5onViewController
class FriendTableViewController: UITableViewController { var nextPageState = NextPageState<Int>() var data:
[Friend] = [] } extension FriendTableViewController: NextPageLoadable { func performLoad( successHandler: ([String], Bool, Int?) -> (), failHandler: () -> ()) { client.send(FriendsRequest()) { result in if let result = result { successHandler(result.items, result.hasNext, result.items.last.id) } else { failHandler() } } } }
class FriendCollectionViewController: UITableViewController { var nextPageState = NextPageState<Int>() var data:
[Friend] = [] } extension FriendCollectionViewController: NextPageLoadable { func performLoad( successHandler: ([String], Bool, Int?) -> (), failHandler: () -> ()) { client.send(FriendsRequest()) { result in if let result = result { successHandler(result.items, result.hasNext, result.items.last.id) } else { failHandler() } } } }
ViewController ၥᦶ
ֵአܐᦓᕟᕢ ViewController • כ೮ᓌܔጱ ViewController ᖀಥ (ٺᖀಥ)
ֵአܐᦓᕟᕢ ViewController • כ೮ᓌܔጱ ViewController ᖀಥ (ٺᖀಥ) • ֵአܐᦓ̿೪ᤰ̀ViewController ಅᵱᥝጱۑᚆ
ֵአܐᦓᕟᕢ ViewController • כ೮ᓌܔጱ ViewController ᖀಥ (ٺᖀಥ) • ֵአܐᦓ̿೪ᤰ̀ViewController ಅᵱᥝጱۑᚆ
• ਖ਼դᎱᨱձړᐶڊ ViewController
ֵአܐᦓᕟᕢ ViewController • כ೮ᓌܔጱ ViewController ᖀಥ (ٺᖀಥ) • ֵአܐᦓ̿೪ᤰ̀ViewController ಅᵱᥝጱۑᚆ
• ਖ਼դᎱᨱձړᐶڊ ViewController • ֵአ᯿ጱොဩਖ਼ܐᦓ᭑Ⴙ᭗አ۸
ݳɾജ ֵአܐᦓଆۗද࠺դᎱᦡᦇ
വគᩒා • Protocol-Oriented Programming in Swi4 - WWDC 15 #408
• Protocols with Associated Types - @alexisgallagher • Protocol Oriented Programming in the Real World - @_maHhewpalmer • PracIcal Protocol-Oriented-Programming - @natashatherobot
ᨀᨀᘰލ FAQ Email:
[email protected]
, GitHub: onevcat