iOSレガシーコード改善ガイド〜マンガボックス開発における事例〜

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ᶃԆ໋ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. objcʹ Nullability, Lightweight GenericsΛ௥Ճ͢Δ 18 @interface UserHistory -(Episode*)lastEepisode; -(NSArray*)allEpisodes; @end NS_ASSUME_NONNULL_BEGIN @interface UserHistory -(nullable Episode*)lastEepisode; -(NSArray*)allEpisodes; NS_ASSUME_NONNULL_END @end

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ᶃԆ໋ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. objcʹ Nullability, Lightweight GenericsΛ௥Ճ͢Δ • طଘͷobjcࢿ࢈Λ҆શʹ࢖͑Δ • ϩʔίετɾϋΠϦλʔϯ • SwiftରԠ΁ͷୈҰาͱͯ͠࠷ద 18 @interface UserHistory -(Episode*)lastEepisode; -(NSArray*)allEpisodes; @end NS_ASSUME_NONNULL_BEGIN @interface UserHistory -(nullable Episode*)lastEepisode; -(NSArray*)allEpisodes; NS_ASSUME_NONNULL_END @end class UserHistory { func lastEepisode()->Episode? func allEepisodes()->[Episode] }

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ᶅ੾Γग़͠ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ϩδοΫΛswiftʹ੾Γग़͢ 22 if (num.integerValue == 0) { NSLog(@"num is zero"); } else { NSLog(@"num is non zero"); } - (NSNumber*)getNum { NSNumber* num = ...; return num; } .m

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ᶅ੾Γग़͠ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ϩδοΫΛswiftʹ੾Γग़͢ 22 - (NSNumber*)getNum { NSNumber* num = ...; return num; } .m + final class NumLogger: NSObject { class func debug(num:NSNumber) { if num.integerValue == 0 { print("num is zero") } else { print("num is non zero") } } } .swi7 [NumLogger debug:num]; • ࠷খݶͷมߋͰطଘobjcϝιουͷϩδοΫΛ௥Ճɾमਖ਼Ͱ͖Δ • ࢖͍Ͳ͜Ζɿϩάग़ྗॲཧɺόϦσʔγϣϯɺUtilతͳॲཧ • Ϣχοτςετ΋ॻ͖΍͍͢

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ᶇextensionύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. طଘobjcΫϥεΛextension͢Δ 26 @implement FooClass - (void)method1 {...} - (void)method2 {...} @end .m + extension FooClass { //ϝιου௥Ճ func method3() { … } } .swi7

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ᶈ๫࿐ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 29 @interface FooClass () @property NSString property1; @end @implement FooClass (void)method1 { ... } @end .m #import “xxx.h” #import “yyy.h” #import “zzz.h” ... @interface FooClass (PrivateForSwift) @property (readonly) NSString *property1; (void)method1; @end Xxxx-‐Bridging-‐Header.h + @interface FooClass @end .h

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ᶈ๫࿐ύλʔϯ Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 29 @interface FooClass () @property NSString property1; @end @implement FooClass (void)method1 { ... } @end .m extension FooClass { func methods() { property1 = “foo"; method1() } } .swi7 + #import “xxx.h” #import “yyy.h” #import “zzz.h” ... @interface FooClass (PrivateForSwift) @property (readonly) NSString *property1; (void)method1; @end Xxxx-‐Bridging-‐Header.h + @interface FooClass @end .h

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ҙਤతʹΧϓηϧԽΛഁյ ⁃ extension͔ΒຊମΫϥεͷϓϥΠϕʔτଐੑ΁ͷΞΫηε͕ Մೳʹ ⁃ มߋՕॴ͸ϒϦοδϯάϔομͷΈɺطଘͷ.h/.m͸มߋͳ͠ ଥڠ͕ඞཁͳ෦෼ ⁃ ҟ࿦ͷग़Δͱ͜Ζ ⁃ Ұ࣌తͳରԠɺͱ͍͏ׂΓ੾Γ ⁃ ͜͜ΛׂΓ੾Ε͹SwiftԽ͸ҰؾʹਐΉ 30 ϓϥΠϕʔτଐੑΛ෦෼తʹެ։͢Δ ᶈ๫࿐ύλʔϯ

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࢀߟɿΞϯνύλʔϯ 35 //ετΞυϓϩύςΟͷ௥Ճ var name:String { get { return objc_getAssociatedObject(self, &key) as! String } set { objc_setAssociatedObject(self, &key, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)} } //ϓϥΠϕʔτϝιουͷ࣮ߦ if respondsToSelector("_reload") { performSelector("_reload") } //ϓϥΠϕʔτϓϩύςΟͷࢀর if let titleLabel = valueForKey("TitleLabel") as? UILabel { ... } • ΧϓηϧԽΛഁյͤͣʹϓϥΠϕʔτ ଐੑΛࢀরɾ௥ՃՄೳ • ϝϯςφϯεੑ˚ • ϚϯΨϘοΫεͰ͸ۃྗ࢖༻͠ͳ͍Α ͏ʹ͍ͯ͠Δ associatedObject Ωʔ஋ίʔσΟϯά objcηϨΫλʔ

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࢀߟɿࣸܦͷ͓ڙʹ • objc→swift ίʔυม׵πʔϧ • https://github.com/yahoojapan/objc2swift • https://objectivec2swift.com/?ref=producthunt#/converter/code • http://iswift.org • https://myappconverter.com • https://itunes.apple.com/us/app/o2swift-objective-c-to-swift/id1060352413?ls=1&mt=12 • ͍ͣΕ΋ػցతͳม׵ͳͷͰख௚͠ˍQA͸ඞਢ 41

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Կ͔ʹࣅ͍ͯΔ 44 ᶃ Ԇ໋ύλʔϯ ᶄ ͝৽نύλʔϯ ᶅ ੾Γग़͠ύλʔϯ ᶆ ϒϦοδύλʔϯ ᶇ extensionύλʔϯ ᶈ ๫࿐ύλʔϯ ᶉ ৐ͬऔΓύλʔϯ ᶊ ࣸܦύλʔϯ h)p://shop.ohmsha.co.jp/shopdetail/000000003881/ ϦϑΝΫλϦϯά

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Կ͔ʹࣅ͍ͯΔ 45 ᶃ Ԇ໋ύλʔϯ ᶄ ͝৽نύλʔϯ ᶅ ੾Γग़͠ύλʔϯ ᶆ ϒϦοδύλʔϯ ᶇ extensionύλʔϯ ᶈ ๫࿐ύλʔϯ ᶉ ৐ͬऔΓύλʔϯ ᶊ ࣸܦύλʔϯ h)p://www.sbcr.jp/products/4797311126.html gof σβΠϯύλʔϯ

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Կ͔ʹࣅ͍ͯΔ 46 ᶃ Ԇ໋ύλʔϯ ᶄ ͝৽نύλʔϯ ᶅ ੾Γग़͠ύλʔϯ ᶆ ϒϦοδύλʔϯ ᶇ extensionύλʔϯ ᶈ ๫࿐ύλʔϯ ᶉ ৐ͬऔΓύλʔϯ ᶊ ࣸܦύλʔϯ h)p://www.shoeisha.co.jp/book/detail/9784798116839 ϨΨγʔίʔυվળΨΠυ

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Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 47 ᶃ Ԇ໋ύλʔϯ ᶄ ͝৽نύλʔϯ ᶅ ੾Γग़͠ύλʔϯ ᶆ ϒϦοδύλʔϯ ᶇ extensionύλʔϯ ᶈ ๫࿐ύλʔϯ ᶉ ৐ͬऔΓύλʔϯ ᶊ ࣸܦύλʔϯ Mix-and-MatchΛ࢖ͬͨSwiftҠߦύλʔϯ طଘͷιϑτ΢ΣΞ։ൃٕ๏ͷ׆༻ʹΑΓ εϜʔζɾ҆શʹSwi7ҠߦՄೳ