プロトコル指向フレンズ -Class to Struct-

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ϓϩτίϧࢦ޲ϑϨϯζ - Class to Struct - @satoshin21

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satoshin21 SatoshiN21 ௕ࡔ ޛࢤ (Nagasaka Satoshi) - iOS Engineer of pairs Div. eureka, Inc. - Swift, Objective-C, Java(Android), Apple Script

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- Pairs - Couples - We are hiring!!

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Objecive-C͔ΒSwift΁

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ΦϒδΣΫτࢦ޲(OOP)͔Β ϓϩτίϧࢦ޲(POP)΁

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ϓϩτίϧࢦ޲ͬͯʁ

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protocolΛ࢖͑͹ ϓϩτίϧࢦ޲Ͱ͢

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ͦΜͳ;͏ʹߟ͍͑ͯͨ࣌ظ͕ ๻ʹ΋͋Γ·ͨ͠

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POPͱOOP͕ܾఆతʹҧ͏ॴ͸

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ClassΛ࢖͏͔ʁ StructΛ࢖͏͔ʁ

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ͱߟ͑Δํ͕͍ۙ

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΋͘͠͸

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ΦϒδΣΫτࢦ޲(Class)ͷऑ఺Λ

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StructͱProtocolͰղܾ͢Δ ύϥμΠϜ

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ͦΕ͕ϓϩτίϧࢦ޲

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ΦϒδΣΫτࢦ޲ͱ͸ʁ

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ΦϒδΣΫτࢦ޲ ‣ &ODBQTVMBUJPO ΧϓηϧԽ ‣ "DDFTT$POUSPM Մࢹੑ੍ޚ ‣ "CTUSBDUJPO ந৅Խ ‣ /BNFTQBDF ໊લۭؒ ‣ &YQSFTTJWF4ZOUBY දݱྗͷ͋Δߏจɻϝιου΍ϓϩύςΟΛ ܨ͛ͯॻ͚ͨΓͳͲ ‣ &YUFOTJCJMJUZ ֦ுੑ

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ΦϒδΣΫτࢦ޲ ‣ &ODBQTVMBUJPO ΧϓηϧԽ ‣ "DDFTT$POUSPM Մࢹੑ੍ޚ ‣ "CTUSBDUJPO ந৅Խ ‣ /BNFTQBDF ໊લۭؒ ‣ &YQSFTTJWF4ZOUBY දݱྗͷ͋Δߏจɻϝιου΍ϓϩύςΟΛ ܨ͛ͯॻ͚ͨΓͳͲ ‣ &YUFOTJCJMJUZ ֦ுੑ ͜ΕΒ͸ܕ(Type)ͷಛ௃

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ΦϒδΣΫτࢦ޲ͷऑ఺

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ΦϒδΣΫτࢦ޲ͷऑ఺ ‣ ҉໧తͳΦϒδΣΫτͷڞ༗ w ࢀর͍ͯ͠ΔΦϒδΣΫτ͕ଞͷΦϒδΣΫτͱڞ༗ w ʮࢀর͍ͯ͠ΔΦϒδΣΫτ͕উखʹҧ͏΋ͷʹͳͬͨΑʂͳʹ ͜Εͳʹ͜Εʂʯ

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ΦϒδΣΫτࢦ޲ͷऑ఺ ‣ ܧঝؔ܎Λ೺Ѳ͢Δͷ͕େม w ͜ͷ6TFS%FUBJM7JFX$POUSPMMFS͸%FUBJM7JFX$POUSPMMFSΛܧঝ ͍ͯͯ͠͞ΒʹͦͷεʔύʔΫϥεʹ͸#BTF7JFX$POUSPMMFS͕ w εʔύʔΫϥε͕ͲͷΑ͏ͳڍಈΛ͢Δͷ͔ɺͲͷΑ͏ͳΦϒδΣ ΫτΛอ͍࣋ͯ͠Δͷ͔Λ೺Ѳ͠ͳ͚Ε͹ͳΒͳ͍ w ʮ͜ͷεʔύʔΫϥεͷ஋Λमਖ਼ͨ͠Βಈ͔ͳ͘ͳͬͨΑʔʂ ͢͝ʔ͍ʂʯ

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ͳͲ

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ͦ͜Ͱొ৔͢Δͷ͕ ϓϩτίϧࢦ޲

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ϓϩτίϧࢦ޲Ͱ͸جຊతʹ Class͸࢖Θͳ͍

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StructͱProtocolͷΈ

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Class to Struct

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ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ஋ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍ ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ

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class DataStore { var strings = [String]() func add(string: String) { strings.append(string) } } ClassΛ༻͍ͨ৔߹

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let dataStore = DataStore() dataStore.add(string: "Foo") dataStore.add(string: "Bar") let classA = ReferenceClassA(dataStore: dataStore) classA.add(string: "hoge") let stringA = classA.dataStoreString() // -> [“Foo","Bar","hoge"] ClassΛ༻͍ͨ৔߹

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let dataStore = DataStore() dataStore.add(string: "Foo") dataStore.add(string: “Bar") let classA = ReferenceClassA(dataStore: dataStore) classA.add(string: "hoge") let stringA = classA.dataStoreString() // -> ["Foo","Bar","hoge"] let classB = ReferenceClassB(dataStore: dataStore) classB.dataStore.strings.removeAll() let stringAre = classA.dataStoreString() // -> [] ClassΛ༻͍ͨ৔߹

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Structͷ৔߹

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struct DataStore { var strings = [String]() mutating func add(string: String) { strings.append(string) } } StructΛ༻͍ͨ৔߹

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var dataStore = DataStore() dataStore.add(string: "Foo") dataStore.add(string: "Bar") var structA = ReferenceStructA(dataStore: dataStore) structA.dataStore.add(string: "hoge") let stringA = structA.dataStoreString() // -> ["Foo","Bar","hoge"] var structB = ReferenceStructB(dataStore: dataStore) structB.dataStore.strings.removeAll() let stringAre = structA.dataStoreString() // -> ["Foo","Bar","hoge"] StructΛ༻͍ͨ৔߹

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ࢀরઌ͕มԽ͢Δ͜ͱΛ ؾʹ͠ͳͯ͘ྑ͍

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ͨͩɺStruct͸ܧঝ͕࢖͑ͳ͍

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is-aؔ܎ͱ͔ಉ͡;Δ·͍ఆٛ ͢Δͱ͖ͱ͔Ͳ͏͢Μͷʁ

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ͦ͜ͰProtocol

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ΦϒδΣΫτࢦ޲ʹΑΔܧঝؔ܎ "OZ0CKFDU &NQMPZFF %FWFMPQFS %JSFDUPS J04%FWFMPQFS ʜ

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ϓϩτίϧࢦ޲ )BT1SPHSBNNJOH4LJMM %JSFDUPS J04%FWFMPQFS "OESPJE%FWFMPQFS )BT.BOBHFNFOU4LJMM

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ϓϩτίϧࢦ޲ͷར఺ ‣ ґଘؔ܎ΛϑϥοτʹͰ͖Δ ‣ ؔ܎ੑ΋௥͍΍͍͢ ‣ 1SPUPDPM&YUFOTJPOʹΑΓɺΦϒδΣΫτࢦ޲ͷܧঝͰ࣮ݱ͖ͯ͠ ͨίʔυͷ࠶ར༻ੑ΋อͯΔ

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Swift Standart LibraryͰ͸ɺ طʹclass͸1ͭΛ࢒͢ͷΈ

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͜ΕͰ໌೔͔Β ϓϩτίϧࢦ޲ϑϨϯζͩͶʔʂ

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͙͢ʹ͸೉ͦ͠͏

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ϓϩτίϧࢦ޲ͷ໰୊఺ ‣ ΦʔϓϯιʔεԽ͞Εͯ͸͍Δ͕ɺະͩ4XJGU͸J04 ͳ͍͠͸ NBD04ΞϓϦ։ൃݴޠͷΠϝʔδ͕ڧ͍ ‣ ͭ·Γɺ$PDPB'SBNFXPSLͱ஥ྑ͘͠ͳ͚Ε͹ͳΒͳ͍ ‣ $PDPB'SBNFXPSL͸DMBTTϕʔε ‣ ΦϒδΣΫτࢦ޲ͱ൱͕ԠͰ΋෇͖߹͏ඞཁ͕͋Δ ‣ ͦΕ͸ɺΦϒδΣΫτࢦ޲ͷةݥੑ ҉໧తΦϒδΣΫτڞ༗ Λ͸ ΒΜͰ͍Δͱ͍͏͜ͱ

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·ͨɺແཧʹ classͱstructΛڞଘͤ͞Δͱɾɾ

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ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ஋ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍ ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ

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ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ஋ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍ ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ ͜ͷҧ͍Λৗʹҙࣝ͢Δඞཁ͕͋Δ