Swift 2.0

Transcript

1. Swi$%2.0
2. h"p:/ /bit.ly/asos_swi1 Iain%Smith%(@_iains)
3. Today's(Outline • Swi%&==&Simple • New%features%in%Swi/%2.0 • Should(you(use(Swi.(in(Produc3on?
4. Adventures*in*Swi. Why$should$we$bother$with$Swi1?
5. [EveryoneLoves+bracketsRight:YES];
6. Stockholm)Syndrome?)1 1"Where"hostages"express"posi/ve"feelings"toward"their"captors
7. Apple's'Marke,ng Designed(for(Safety Fast%and%Powerful Modern,(markdown,(REPL,(Generics Objec&ve(C*Interoperability
8. Swi$%is%simple
9. Objec&ve(C*Example #import <Foundation/Foundation.h> #import <CoreGraphics/CoreGraphics.h> @class Animal; @interface Park : NSObject @property (nonatomic, readonly) NSArray *animals - (Animal *)animalNearestPoint:(CGPoint)point; @end
10. Swi$%Example @import CoreGraphics class Park { private(set) var animals: [Animal] = [] func animalNearestPoint(point: CGPoint) -> Animal? { // Method body omitted } }
11. Annotated(Objec-ve/C(Example #import <Foundation/Foundation.h> #import <CoreGraphics/CoreGraphics.h> @class Animal; @interface Park : NSObject @property (nonatomic, strong, nonnull) NSArray *animals; - (nullable Animal *)animalNearestPoint:(CGPoint)point; @end
12. RX#Example#(Reac-ve#Cocoa) Objec&ve(C @interface NUKImageProcessor : NSObject - (RACSignal *)imageForBook:(Book *)obj; // Internal - (RACSignal *)requestForBook:(Book *)obj; - (RACSignal *)processForBook:(Book *)obj; @end
13. RX#Example#(Reac-ve#Cocoa) Swi$ class ImageProcessor { func imageForBook(book: Book) -> Signal<UIImage, NSError> {} //Internal func requestForBook(book: Book) -> Signal<ImageData, NSError> {} func processForBook(book: Book) -> Signal<UIImage, NoError> {} }
14. Swi$%let's%you%build%safe,%expressive% abstrac8ons.
15. Truth&is&ever&to&be& found&in&simplicity,&and& not&in&the&mul7plicity& and&confusion&of& things. —"Sir"Isaac"Newton
16. What’s'new'in'Swi-'2.0 New$Error$Handling$Model Powerful)control)flow)with)do,)guard,)defer,)and)repeat Protocol'extensions'and'default'implementa3ons
17. Think&Different! Pa#erns(in(Swi,
18. Error$Handling do { let str = try NSString(contentsOfFile: "Foo.bar", encoding: NSUTF8StringEncoding) } catch let error as NSError { print(error.localizedDescription) }
19. Protocol'Extensions protocol APIEndpoint { var endpoint: String { get } var base: String { get } } extension APIEndpoint { var url : NSURL { return NSURL(string: base+endpoint)! } }
20. enum SlackUsersEndpoint : APIEndpoint { case List case Info(SlackUser) var endpoint: String { switch(self) { case .Info(let user): return "info?user=\(user.id)" case .List: return "list" } } var base: String { return "https://slack.com/api/users." } }
21. Extensions)on)Standard)Types protocol Sumable { init() func + (lhs: Self, rhs: Self) -> Self } extension Int : Sumable {} extension Double: Sumable {} extension SequenceType where Generator.Element: Sumable { var sum: Generator.Element { return reduce(Generator.Element()) { $0 + $1 } } } [5, 3, 5, 1].sum [3.4, 4.5, 2.0].sum
22. Defer func processing() { self.delegate?.didStartProcessing() if (active) { if (encoding) { self.delegate?.didFinishProcessing } } else { self.delegate?.didFinishProcessing } }
23. func processing() { self.delegate?.didStartProcessing() defer { self.delegate?.didFinishProcessing } // code emitted. }
24. Guard&&&Extensions
25. Availability if #available(iOS 8.0, OSX 10.10, *) { // Use Handoff APIs when available. let activity = NSUserActivity(activityType:"com.example.ShoppingList.view") activity.becomeCurrent() } else { // Fall back when Handoff APIs not available. } @available(iOS 8.0, OSX 10.10, *) func startUserActivity() -> NSUserActivity { }
26. Ready&for&produc-on? • The%Tooling%problem • The%Compila1on%problem • The%Team%problem • The%Client/deadline%problem • The%How%do%I%do%that%in%Swi9%problem?
27. Thank&You