Swiftのアプリ開発でハマったこと

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Swift LT @Wantedly 2014-07-17 yohei sugigami

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ਿ্༸ฏ εΪΨϛϤ΢ϔΠ (JU)VC!TVTJFZZ ઌ݄+0*/ͨ͠͹͔Γͷ৽ถϓϩάϥϚʔ ! ! ! 8BOUFEMZͰ͸ߴ͍2JJUBྗ͕ٻΊΒΕΔ SwiftͰ̎Ґ

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ɾSwiftͷΞϓϦ։ൃͰϋϚͬͨ ɹ͜ͱ ̍̌ݸ ! ɾXcode6ͱSwiftͷΞϓϦ։ൃͰ ɹ౿Μͩ஍ཕͨͪ̔ݸ ΞδΣϯμ

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Xcode6Ͱ৽نͷΞϓϦΛ։ൃͨ࣌͠ʹؾ͍ͮͨ͜ͱ Λ·ͱΊ·͢ɻΞϓϦͷ࢓༷͸ҎԼͷͱ͓Γɻ ! - ։ൃݴޠ͸Swift - CocoapodsͰطଘObjcͷϥΠϒϥϦΛར༻ - σϓϩΠλʔήοτ͸iOS8Ҏ্ - StoryboardΛར༻ - AutolayoutͱSizeClassesΛར༻

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։ൃ؀ڥ͸ҎԼͷͱ͓Γɻ ! - Xcode6͸Beta2, 3Λར༻ - ݕূ࣮ػ͸iOS8 Beta2, 3ΛΠϯετʔϧͷiPhone5 ! Beta2Ͱ։ൃ͍ͯͨ͠ΒɺBeta3͕ग़·ͨ͠ ʘ(^o^)ʗ

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SwiftͷΞϓϦ։ൃͰ ϋϚͬͨ͜ͱ

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ҎԼͷ༷ͳObjCϝιουʹSwiftͷ ΫϩʔδϟΛ౉͢ํ๏ @interface HogeFuga : NSObject + (void) hogeUsingBlock:(id)bock; @end

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ObjC id = Swift AnyObject

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HogeFuga.hogeUsingBlock( { () -> () in println("Fuga") }) ERROR Type '() -> ()' does not conform to protocol 'AnyObject'

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var closures: AnyObject = { () in println("Fuga") } ERROR Type '() -> ()' does not conform to protocol 'AnyObject'

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typedef void (^Block)(); ! @interface HogeFuga (Wrapper) + (void) hogeUsingBlockWrapper:(Block)block; @end ! @implementation HogeFuga (Wrapper) + (void) hogeUsingBlockWrapper:(Block)block; { [HogeFuga hogeUsingBlock:block]; } @end ObjCͰܕΛ໌ࣔͨ͠ϒϩοΫΛ ࣋ͭϝιουͰϥοϓ͢Δ

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NSObject#descriptionΛΦʔόʔϥ Πυ͢Δ ᶄ

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class Hoge: NSObject { var name: String? var note: String? override func description() -> String { return "Name = \(self.name), Note = \(self.note)" } } ERROR Method does not override any method from its superclass

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class Hoge: NSObject { var name: String? var note: String? override var description: String! { get { return "Name = \(self.name), Note = \(self.note)" } } } ϓϩύςΟͷΦʔόʔϥΠυ͢Δ

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ObjCͷenum஋ΛSwiftه๏Ͱهࡌ ͢Δํ๏͕Θ͔Βͳ͍ ᶅ

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Swift UIViewAutoresizing.FlexibleLeftMargin typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) { UIViewAutoresizingNone = 0, UIViewAutoresizingFlexibleLeftMargin = 1 << 0, … } ObjC UIViewAutoresizingFlexibleLeftMargin Θ͔Γ΍͍͢ྫ

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Swift UIViewAnimationOptions.LayoutSubviews typedef NS_OPTIONS(NSUInteger, UIViewAnimationOptions) { UIViewAnimationOptionLayoutSubviews = 1 << 0, UIViewAnimationOptionAllowUserInteraction = 1 << 1, … } ObjC UIViewAnimationOptionLayoutSubviews ڐ༰ൣғͳྫ

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Swift HogeStyle.FugaValue1 typedef NS_ENUM(NSInteger, HogeStyle) { HogeFugaDefault, HogeFugaValue1, HogeFugaValue2, HogeFugaSubtitle }; ObjC HogeFugaValue1 ෳࡶͳྫʢPreﬁx͕Ұக͍ͯ͠ͳ͍ʣ

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enumܕͷϝιουҾ਺΍ม਺ʹ enumͰఆٛ͞Εͨఆ਺Ҏ֎Λઃఆ ͢ΔͱΤϥʔʹͳΔ ᶆ

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typedef NS_ENUM(NSInteger, UIViewContentMode) { UIViewContentModeScaleToFill, ... } ! self.view.contentMode = 0 ! // => ERROR Cannot convert the expression's type '()' to type 'UIViewContentMode' Swiftͷܕ͸ݫ͍͠Ͱ͢Ͷ

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εΧϥʔܕͷΩϟετ͸ίϯόʔ δϣϯΛ࢖͏ ᶇ

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let i: Int = Int(1.0) let n: NSInteger = NSInteger(1.0) ! let f: Float = Float(100) let d: Double = Double(100) let g: CGFloat = CGFloat(100) SwiftͰ͸εΧϥʔܕͷΩϟετ͸ͳ͍ ୅ΘΓʹίϯόʔδϣϯΛར༻

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let index: NSInteger = 1 let width: CGFloat = 100 let r = width * (CGFloat)index ! // => ERROR Consecutive statements on a line must be separated by ';' ObjCϥΠΫͳΩϟετ͸Ͱ͖ͳ͍

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let someObjects: [AnyObject] = [ Movie(name: "2001: A Space", director: "Stan"), Movie(name: "Moon", director: "Duncan Jones"), Movie(name: "Alien", director: "Ridley Scott") ] ! for object in someObjects { let movie = object as Movie // Type Casting ! println("Movie: '\(movie.name)', dir. \(movie.director)") } ิ଍  ΦϒδΣΫτܕ͸ΩϟετՄೳ

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for movie in someObjects as [Movie] { println("Movie: '\(movie.name)', dir. \(movie.director)") } ഑ྻΛΩϟετ͢ΔͱίϯύΫτʹॻ͚Δ

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CGFloatͱFloat·ͨ͸Doubleͷԋࢉ ᶈ

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import CoreGraphics ! typealias CGFloat = Float CoreGraphicsʹ͸CGFloat͸FloatͱΤΠϦΞ ε͞Ε͍ͯΔ

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let index: NSInteger = 1 let width: CGFloat = 100 let r1 = width * Float(index) ! // => ERROR Could not find an overload for '*' that accepts the supplied arguments CGFloatͱFloatͷԋࢉ Ұݟਖ਼͘͠ಈ࡞ͦ͠͏͕ͩΤϥʔʹͳΔ

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ͳͥͳΒ iPhone5s(arm64)ΛλʔήοτʹϏ ϧυ͍ͯ͠Δ͔Β

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͜ͷͱ͖CGFloat͸SwiftͷDouble ʹΤΠϦΞε͞ΕΔ

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let index: NSInteger = 1 let width: CGFloat = 100 let r2 = width * Double(index) // => OK iPhone5s(arm64)ͷ৔߹͸Doubleͩͱίϯ ύΠϧͰ͖Δ

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let index: NSInteger = 1 let width: CGFloat = 100 let r = width * CGFloat(index) // => OK CGFloatͱͷԋࢉ͸CGFloatʹίϯόʔ δϣϯ͠·͠ΐ͏

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ObjCͷNSIntegerͱSwiftͷIntͷԋ ࢉ ᶉ

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typealias NSInteger = Int ! ! let i: Int = 1 let n: NSInteger = 1 let x: CGFloat = 3 let y: Float = 3 let w = i + Int(x) + Int(y) // => OK let q = n + Int(x) + Int(y) // => OK ! if n == i { println("HERE!") // => OK }

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let u: NSUInteger = 1 ! // ERROR => Use of undeclared type 'NSUInteger'; did you mean to use 'Int'? NSUInteger ͸ར༻Ͱ͖·ͤΜ

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ΫϩʔδϟܕϓϩύςΟͷΦϓ γϣφϧͳॻ͖ํ ᶊ

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class Fuga { var completion: ( () -> () )? } ؙׅހͰׅΓ·͢

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ObjCͷClassܕΛύϥϝʔλʹͱΔ ϝιουʹSwiftͷClassΛ౉͢ํ๏ ᶋ

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@interface RKObjectMapping : RKMapping { +(instancetype)mappingForClass:(Class)objectClass } ! ! @implementation RKObjectMappingOp… { return [mapping.objectClass new]; } ౉ͨ͠Classܕ͕ObjCଆͰnew͞ΕΔέʔε ʢྫɿ Restkit)

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Swift͔ΒͲ͏͍͏ clazz Λ౉ͤ͹͍͍ͷ͔ class HogeModel: NSObject { } ! ! var clazz = ???  let mapping: RKObjectMapping = RKObjectMapping(forClass: clazz)

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var clazz: AnyClass = NSClassFromString(“WTDHogeModel”) ! // ERROR => EXC_BAD_INSTRUNCTION ࣦഊᶃ NSClassFromStringͰ౉͢

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var clazz: AnyClass = object_getClass(WTDHogeModel()) ! ! // newͰERROR [mapping.objectClass new]; ࣦഊᶄ object_getClassͰ౉͢

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var clazz: NSObject.Type = WTDHogeModel.self  let mapping: RKObjectMapping = RKObjectMapping(forClass: clazz) ! ! // ʹʼ OK ݁࿦ NSObject.TypeΛ౉͢

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γϯάϧτϯύλʔϯΛ࣮૷͢Δ ̏ͭͷํ๏ ᶌ

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! ! ஗ԆॳظԽʢlazy initializationʣͱεϨου ηʔϑʢthread safetyʣ͕ߟྀ͞Ε࣮ͨ૷

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class Singleton { class var sharedInstance : Singleton { struct Static { static var onceToken : dispatch_once_t = 0 static var instance : Singleton? = nil } dispatch_once(&Static.onceToken) { Static.instance = Singleton() } return Static.instance! } } dispatch_onceͰఆٛ ObjCͱಉ༷ͷ࣮૷ํ๏  ຖճ͜ΕΛॻ͘ʹͷ͸େม

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let _SingletonSharedInstance = Singleton() ! class Singleton { class var sharedInstance : Singleton { return _SingletonSharedInstance } } άϩʔόϧఆ਺Ͱఆٛ ࠓޙSwiftͷݴޠ࢓༷͕มߋ͞Εہॴతά ϩʔόϧม਺͕ఆٛͰ͖ΔΑ͏ʹͳΕ͹ɺ ͜ͷ࣮૷ํ๏͕΋ͬͱ΋γϯϓϧ

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class Singleton { class var sharedInstance : Singleton { struct Static { static let instance : Singleton = Singleton() } return Static.instance } } structͷstaticఆ਺Ͱఆٛ ʢਪ঑ʣ Swiftͷclass͸staticఆ਺Λར༻Ͱ͖ͳ͍ͷ ͰɺstructͰωετͯ͠staticఆ਺Λอ࣋

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Xcode6ͱSwift&iOS8 ͷΞϓϦ։ൃͰ౿Μ ͩ஍ཕͨͪ

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ίϯύΠϧΤϥʔ XXXHeaderϑΝΠϧ has been modiﬁed since the precompiled header ᶃ

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fatal error: ﬁle ‘…/UIKit.framework/ Headers /UIVisualEffectView.h’ has been modiﬁed since the precompiled header …

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ରԠํ๏ ຖճͳ͔ͥͳ͓ΔରԠํ๏͕·ͪ·ͪ ! - Xcode6࠶ىಈ - ϏϧυΛΫϦʔϯ͢Δ - DerivedDataΛ࡟আ͢Δ - OSXΛ࠶ىಈ͢Δ - Xcode6ΛೖΕͳ͓͢ orz

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ᶄ IBOutletͷStoryboardͱͷίωΫ γϣϯ͋Γ͕දࣔ͞Εͳ͍৔߹͕ ͋Δ

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ίϯύΠϧޙͷΞϓϦͷڍಈ͸ਖ਼͘͠઀ଓ ͞Ε͍ͯΔঢ়ଶͰಈ࡞͍ͯ͠·ͨ͠

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ᶅ StoryboardͷϑΝΠϧΛ։͍ͯ΋ XMLͰදࣔ͞ΕΔ

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XML…

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໌ࣔతʹ։͖·͠ΐ͏

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ᶆ ιʔείʔυϋΠϥΠτͱೖྗิ ׬͕ޮ͔ͳ͘ͳΔ

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ͨ·ʹ෮׆΋͠·͆͢

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ᶇ γϛϡϨʔλʔͰΞϓϦΛىಈ͠ Α͏ͱ͢ΔͱΤϥʔʹͳΔ

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Xcode6ͱγϛϡϨʔλʔΛ࠶ىಈ ͨ͠Βͳ͓Γ·ͨ͠ɻ

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ᶈ Xcode5ͱXcode6ͷγϛϡϨʔλʔ Ͱಉ࣌ʹΞϓϦΛىಈͰ͖ͳ͍

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ͲͪΒ͔ͷγϛϡϨʔλʔΛऴྃ ͠·͠ΐ͏

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ᶉ switchͱॻ͘ͱXcode͕ϑϦʔζ͢ Δ

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Beta3Ͱ͸·ͩग़͍ͯͳ͍Ͱ͢

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ᶊ ޡͬͯϓϩδΣΫτΛXcode5Ͱ։ ͍ͯStroyboardΛ։͘ͱXcode6Ͱ Stroyboard͕͓͔͘͠ͳ͍ͬͯΔ

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Xcode5Ͱޡͬͯ։͍ͨΒԿ΍ΒΤϥʔ͕ ϑΝΠϧ͕ഁյ͞Ε·ͨ͠ɻ git reset ͳͲͰϑΝΠϧΛ໭͠·͠ΐ͏ɻ

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Finder͔ΒϓϩδΣΫτϑΝΠϧΛ μϒϧΫϦοΫͯ͠։͘ͱXcode5 Ͱ։͔ΕΔ͜ͱ΋͋Γ·͢ɻ

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Xcode5Λىಈ͢ΔͱɺXcode6Ͱ࡞ ۀ͍ͯͨ͠ϓϩδΣΫτΛউखʹ ։͘৔߹͕͋Γ·͢ɻ

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༧๷ࡦ ! ̍. gitͳͲͰࡉ͔͘ίϛοτͯ͠ϩʔϧόοΫͰ͖Δ Α͏ʹ ! ̎. Xcode6ͰϓϩδΣΫτΛ։͍ͨΒετʔϦϘʔυ Λ࠷ऴฤूը໘ʹͯ͠ด͡ͳ͍ ! ̏. Xcode6Λऴྃ͢Δͱ͖͸ϓϩδΣΫτΛด͔ͯ͡ Βऴྃ͢Δ ! ̐. Xcode5ΛࣺͯΔ͆

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iOS,Android Rails ΤϯδχΞ ืूத hiring@wantedly.com ڵຯ͕͋Δํ͸ͪ͜Β͔Β͝࿈བྷ͍ͩ͘͞ ৽͍ٕ͠ज़ʹͲΜͲΜ௅ઓ͍ͨ͠ ϞόΠϧΤϯδχΞɾ΢Υϯςουʂʂ ͪ͜Β͔ΒͰ΋OKͰ͢

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͓ΘΓ