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プロトコル指向フレンズ -Class to Struct-
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satoshin21
February 15, 2017
Programming
3
1.9k
プロトコル指向フレンズ -Class to Struct-
オブジェクト指向と対比して取り上げられるプロトコル指向について、ClassとStructそれぞれの特徴をベースにまとめました #potatotips37
satoshin21
February 15, 2017
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Transcript
ϓϩτίϧࢦϑϨϯζ - Class to Struct - @satoshin21
satoshin21 SatoshiN21 ࡔ ޛࢤ (Nagasaka Satoshi) - iOS Engineer of
pairs Div. eureka, Inc. - Swift, Objective-C, Java(Android), Apple Script
- Pairs - Couples - We are hiring!!
Objecive-C͔ΒSwift
ΦϒδΣΫτࢦ(OOP)͔Β ϓϩτίϧࢦ(POP)
ϓϩτίϧࢦͬͯʁ
protocolΛ͑ ϓϩτίϧࢦͰ͢
ͦΜͳ;͏ʹߟ͍͑ͯͨ࣌ظ͕ ʹ͋Γ·ͨ͠
POPͱOOP͕ܾఆతʹҧ͏ॴ
ClassΛ͏͔ʁ StructΛ͏͔ʁ
ͱߟ͑Δํ͕͍ۙ
͘͠
ΦϒδΣΫτࢦ(Class)ͷऑΛ
StructͱProtocolͰղܾ͢Δ ύϥμΠϜ
ͦΕ͕ϓϩτίϧࢦ
ΦϒδΣΫτࢦͱʁ
ΦϒδΣΫτࢦ ‣ &ODBQTVMBUJPO ΧϓηϧԽ ‣ "DDFTT$POUSPM Մࢹੑ੍ޚ ‣
"CTUSBDUJPO நԽ ‣ /BNFTQBDF ໊લۭؒ ‣ &YQSFTTJWF4ZOUBY දݱྗͷ͋ΔߏจɻϝιουϓϩύςΟΛ ܨ͛ͯॻ͚ͨΓͳͲ ‣ &YUFOTJCJMJUZ ֦ுੑ
ΦϒδΣΫτࢦ ‣ &ODBQTVMBUJPO ΧϓηϧԽ ‣ "DDFTT$POUSPM Մࢹੑ੍ޚ ‣
"CTUSBDUJPO நԽ ‣ /BNFTQBDF ໊લۭؒ ‣ &YQSFTTJWF4ZOUBY දݱྗͷ͋ΔߏจɻϝιουϓϩύςΟΛ ܨ͛ͯॻ͚ͨΓͳͲ ‣ &YUFOTJCJMJUZ ֦ுੑ ͜ΕΒܕ(Type)ͷಛ
ΦϒδΣΫτࢦͷऑ
ΦϒδΣΫτࢦͷऑ ‣ ҉తͳΦϒδΣΫτͷڞ༗ w ࢀর͍ͯ͠ΔΦϒδΣΫτ͕ଞͷΦϒδΣΫτͱڞ༗ w ʮࢀর͍ͯ͠ΔΦϒδΣΫτ͕উखʹҧ͏ͷʹͳͬͨΑʂͳʹ ͜Εͳʹ͜Εʂʯ
ΦϒδΣΫτࢦͷऑ ‣ ܧঝؔΛѲ͢Δͷ͕େม w ͜ͷ6TFS%FUBJM7JFX$POUSPMMFS%FUBJM7JFX$POUSPMMFSΛܧঝ ͍ͯͯ͠͞ΒʹͦͷεʔύʔΫϥεʹ#BTF7JFX$POUSPMMFS͕ w εʔύʔΫϥε͕ͲͷΑ͏ͳڍಈΛ͢Δͷ͔ɺͲͷΑ͏ͳΦϒδΣ ΫτΛอ͍࣋ͯ͠Δͷ͔ΛѲ͠ͳ͚ΕͳΒͳ͍ w
ʮ͜ͷεʔύʔΫϥεͷΛमਖ਼ͨ͠Βಈ͔ͳ͘ͳͬͨΑʔʂ ͢͝ʔ͍ʂʯ
ͳͲ
ͦ͜Ͱొ͢Δͷ͕ ϓϩτίϧࢦ
ϓϩτίϧࢦͰجຊతʹ ClassΘͳ͍
StructͱProtocolͷΈ
Class to Struct
ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍
ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ
class DataStore { var strings = [String]() func add(string: String)
{ strings.append(string) } } ClassΛ༻͍ͨ߹
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༻͍ͨ߹
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༻͍ͨ߹
Structͷ߹
struct DataStore { var strings = [String]() mutating func add(string:
String) { strings.append(string) } } StructΛ༻͍ͨ߹
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"] StructΛ༻͍ͨ߹
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༻͍ͨ߹
ࢀরઌ͕มԽ͢Δ͜ͱΛ ؾʹ͠ͳͯ͘ྑ͍
ͨͩɺStructܧঝ͕͑ͳ͍
is-aؔͱ͔ಉ͡;Δ·͍ఆٛ ͢Δͱ͖ͱ͔Ͳ͏͢Μͷʁ
ͦ͜ͰProtocol
ΦϒδΣΫτࢦʹΑΔܧঝؔ "OZ0CKFDU &NQMPZFF %FWFMPQFS %JSFDUPS J04%FWFMPQFS ʜ
ϓϩτίϧࢦ )BT1SPHSBNNJOH4LJMM %JSFDUPS J04%FWFMPQFS "OESPJE%FWFMPQFS )BT.BOBHFNFOU4LJMM
ϓϩτίϧࢦͷར ‣ ґଘؔΛϑϥοτʹͰ͖Δ ‣ ؔੑ͍͍͢ ‣ 1SPUPDPM&YUFOTJPOʹΑΓɺΦϒδΣΫτࢦͷܧঝͰ࣮ݱ͖ͯ͠ ͨίʔυͷ࠶ར༻ੑอͯΔ
Swift Standart LibraryͰɺ طʹclass1ͭΛ͢ͷΈ
͜ΕͰ໌͔Β ϓϩτίϧࢦϑϨϯζͩͶʔʂ
͙͢ʹͦ͠͏
ϓϩτίϧࢦͷ ‣ ΦʔϓϯιʔεԽ͞Ε͍ͯΔ͕ɺະͩ4XJGUJ04 ͳ͍͠ NBD04ΞϓϦ։ൃݴޠͷΠϝʔδ͕ڧ͍ ‣ ͭ·Γɺ$PDPB'SBNFXPSLͱྑ͘͠ͳ͚ΕͳΒͳ͍ ‣ $PDPB'SBNFXPSLDMBTTϕʔε ‣
ΦϒδΣΫτࢦͱ൱͕ԠͰ͖߹͏ඞཁ͕͋Δ ‣ ͦΕɺΦϒδΣΫτࢦͷةݥੑ ҉తΦϒδΣΫτڞ༗ Λ ΒΜͰ͍Δͱ͍͏͜ͱ
·ͨɺແཧʹ classͱstructΛڞଘͤ͞Δͱɾɾ
ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍
ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ
ClassͱStruct $MBTT 4USVDU ܕ 5ZQF ࢀরܕ ܕ ܧঝ Ͱ͖Δ Ͱ͖ͳ͍
ϓϩύςΟมߋ Մೳ جຊతʹෆՄೳ ͜ͷҧ͍Λৗʹҙࣝ͢Δඞཁ͕͋Δ
·ͩզʑ ΦϒδΣΫτࢦ͔ΒΕΒΕͳ͍
SwiftϚϧνύϥμΠϜͳͷͰ ͏·͘ڞଘ͍ͤͯ͘͞ࣄ͕ॏཁ
ʔ͖ʔ͖ʂ
ύϥμΠϜʹΑͬͯ ͱ͍͘ͳ͜ͱҧ͏͔Βʂ
֤ύϥμΠϜͷಛੑΛཧղͯ͠ ॊೈͳϓϩάϥϛϯάΛ
Thank you IUUQTXXXOBTBHPWNJTTJPO@QBHFT/11OFXTFBSUIBUOJHIUIUNM