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面向协议编程与 Cocoa 的邂逅
Wei Wang
September 24, 2016
Technology
14
4.1k
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
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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: onev@onevcat.com, GitHub: onevcat