Mobile Programming enum

モバイルプログラミングの授業で使うスライドです

Transcript

1. ྻڍܕ
   MOBILE PROGRAMMING 12TH DEC
   

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2. 1. ྻڍܕʁ
   

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3. ςΩετ
   ྻڍܕ(ENUM)ͱ͸ʁ
   ▸ ؔ࿈͢Δ஋ΛҰͭͷܕͱͯ͠·ͱΊͨ΋ͷ
   ▸ ྫ͑͹ϙέϞϯͷλΠϓͳͲ͸ྻڍܕ(enum)Ͱද͢͜ͱ͕Ͱ
   ͖Δ
   ▸ λΠϓͰॲཧΛ෼͚͍ͨ৔߹จࣈྻ΍਺ࣈΛ࢖͏ΑΓ΋enum
   Λ࢖͏ํ͕ϛεΛແ͘͠΍͘͢ɺ҆શʹ࣮૷͢Δ͜ͱ͕Ͱ͖Δ
   ▸ จ๏͸enum { case member1 case member2 }
   

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4. ςΩετ
   ࣮ࡍͷίʔυ(ENUMͷఆٛ)
   // ϙέϞϯͷλΠϓΛEnumͰ·ͱΊͨ৔߹
   enum PokemonType {
   case fire // ΄ͷ͓λΠϓ
   case grass // ͘͞λΠϓ
   case water // ΈͣλΠϓ
   case normal // ϊʔϚϧλΠϓ
   }
   

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5. ςΩετ
   ࣮ࡍͷίʔυ(ม਺ʹೖΕΔ)
   // ϙέϞϯͷλΠϓΛEnumͰ·ͱΊͨ৔߹
   enum PokemonType {
   case fire // ΄ͷ͓λΠϓ
   case grass // ͘͞λΠϓ
   case water // ΈͣλΠϓ
   case normal // ϊʔϚϧλΠϓ
   }
   var pokemonType: PokemonType
   pokemonType = PokemonType.fire // جຊܕ
   pokemonType = .grass // ܕͷ໊લ͸লུՄೳ
   

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6. ςΩετ
   ࣮ࡍͷίʔυ(ϓϩύςΟ΍ϝιου΋ఆٛͰ͖·͢)
   enum PokemonType {
   // লུ…
   func getTypeString() -> String {
   switch self {
   case .fire: return "΄ͷ͓"
   case .grass: return "͘͞"
   case .water: return "Έͣ"
   case .normal: return "ϊʔϚϧ"
   }
   }
   }
   var pokemonType: PokemonType = .fire
   print(pokemonType.getTypeString()) // ϝιουݺͼग़͠
   

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7. 2. ENUMʹ͍ͭͯ
   

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8. ςΩετ
   ENUMͷಛ௃
   ▸ switch(NintendoͰͳ͍)Ͱ enum Λ࢖͏৔߹defaultΛॻ͔
   ͳͯ͘͢Ή(໢ཏνΣοΫ)
   ▸ ϝϯόʔ͕஋Λ࣋ͨͤΔ͜ͱ͕Ͱ͖Δ (஋ܕenum)
   ▸ ϝϯόʔʹؔ࿈͢ΔܕΛ͚ͬͭ͘Δ͜ͱ͕Ͱ͖Δ (ؔ࿈ܕ
   enum)
   

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9. 2-1. ENUMͷ໢ཏ
   νΣοΫ
   

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10. ςΩετ
    ໢ཏνΣοΫ?
    ▸ enum Ͱ switchͰ৚݅෼ذΛߦ͏ࡍʹνΣοΫ͕ೖΔ
    ▸ ͦͷenumͷϝϯό͕શͯྻڍ͞Ε͍ͯΔ͔ΛνΣοΫͯ͠
    ଍Γͳ͍৔߹͸ΤϥʔΛग़͢(ίϯύΠϧΤϥʔ)
    ▸ ྻڍܕͷϝϯό͸਺͕ܾ·͍ͬͯΔͷͰ͜ͷΑ͏ͳνΣοΫ
    ͕Մೳ
    ▸ ΤϥʔΛղফ͢Δʹ͸શͯͷϝϯόΛྻڍ͢Δ͔ default Λ
    هड़͢Δ
    

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11. ςΩετ
    ࣮ࡍͷίʔυ(͜ͷΑ͏ͳENUM͕͋ͬͨ৔߹)
    // ϙέϞϯͷλΠϓΛEnumͰ·ͱΊͨ৔߹
    enum PokemonType {
    case fire // ΄ͷ͓λΠϓ
    case grass // ͘͞λΠϓ
    case water // ΈͣλΠϓ
    case normal // ϊʔϚϧλΠϓ
    }
    

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12. ςΩετ
    ࣮ࡍͷίʔυ(͜Μͳ෩ʹνΣοΫ͕͞Ε·͢)
    // ͬͪ͜͸OK(ϝϯό͕શͯྻڍ͞Ε͍ͯΔ)
    func getTypeString() -> String {
    switch self {
    case .fire: return "΄ͷ͓"
    case .grass: return "͘͞"
    case .water: return "Έͣ"
    case .normal: return "ϊʔϚϧ"
    }
    }
    // ͬͪ͜͸NG(ϝϯό͕શͯྻڍ͞Ε͍ͯͳ͍)
    func getTypeString() -> String {
    switch self {
    case .fire: return "΄ͷ͓"
    case .grass: return "͘͞"
    case .water: return "Έͣ"
    }
    }
    // ͬͪ͜΋OK(ϝϯό͕શͯྻڍ͞Ε͍͍ͯͳ͍͕default͕͋Δ)
    func getTypeString() -> String {
    switch self {
    case .fire: return "΄ͷ͓"
    case .grass: return "͘͞"
    default: return “ϊʔϚϧ"
    }
    }
    // ͬͪ͜΋NG(default͕༨ܭ)
    func getTypeString() -> String {
    switch self {
    case .fire: return "΄ͷ͓"
    case .grass: return "͘͞"
    case .water: return "Έͣ"
    case .normal: return “ϊʔϚϧ"
    default: return "ϊʔϚϧ"
    }
    }
    

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13. 2-2. ஋ܕENUM
    

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14. ςΩετ
    ஋ܕENUM?
    ▸ enumͷϝϯόʹInt, Float(or Double), String ͷ஋Ληοτͨ͠
    Enumͷ͜ͱ
    ▸ จ๏͸ enum : Type { case member1 =
    … }
    ▸ ϝϯόʹ༩͑ΒΕͨ஋͸ variable.rawValue ͱ͍͏ܗͰऔಘ͕Մೳ
    ▸ ·ͨ EnumName(rawValue: ) ͱ͍͏ܗͰenumͷऔಘ͕
    Մೳ
    

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15. ςΩετ
    ࣮ࡍͷίʔυ(STRINGΛ࢖ͬͨ৔߹)
    // ϙέϞϯͷλΠϓʹจࣈΛ௥Ճ
    enum PokemonType: String {
    case fire = "΄ͷ͓"
    case grass = "͘͞"
    case water = "Έͣ"
    case normal = "ϊʔϚϧ"
    }
    var pokemonType = PokemonType(rawValue: "΄ͷ͓") ?? .normal // enumΛ࡞੒
    print(pokemonType.rawValue)
    

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16. 2-3. ؔ࿈ܕENUM
    

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17. ςΩετ
    ؔ࿈ܕENUM?
    ▸ Enumͷϝϯόʹରͯؔ͠࿈͢ΔܕΛࢦఆ͢Δ͜ͱͷͰ͖Δ
    ػೳ
    ▸ ஋ܕͷEnumͱ͸ҧ͍ϝϯόʹܕ͚ͩΛࢦఆ͢Δ
    ▸ จ๏͸ enum : Type { case member1(Type)
    … }
    ▸ ͲΜͳঢ়ଶ͔ͱ͍͏͜ͱ͚ͩͰͳͦ͘Εʹ෇ਵ͢Δ෇Ճ৘ใ
    Λ͚ͬͭ͘Δ͜ͱ͕Ͱ͖Δ
    

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18. ۩ମྫ
    

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19. ςΩετ
    ͜ΕΛ࣮૷͍ͨ͠
    

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20. ςΩετ
    ۩ମྫ
    func formattedPostDateTime(datetime: Int) -> String {
    // ࣮૷...
    }
    // Ҿ਺ʹͲΕ͘Β͍લ͔࣌ؒΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10)
    

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21. Μʁ
    

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22. ςΩετ
    ۩ମྫ
    func formattedPostDateTime(datetime: Int) -> String {
    // ࣮૷...
    }
    // Ҿ਺ʹͲΕ͘Β͍લ͔࣌ؒΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10) // <- "10" ͸ 10೔લʁ 10࣌ؒ
    લʁ 10෼લʁ 10ඵલʁ
    

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23. ୯ҐΛ༩͑ΔͷΛ
    ๨Ε͍ͯ·ͨ͠
    

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24. ςΩετ
    ͜ΕͰOK…?
    // Ҿ਺ʹ࣌ؒͷ୯ҐΛ௥Ճ
    func formattedPostDateTime(datetime: Int, termType: Int) -> String {
    switch termType {
    case 0: return "\(datetime)೔લ"
    case 1: return "\(datetime)࣌ؒલ"
    // লུ...
    default: return "গ͠લ"
    }
    }

    // Ҿ਺ʹͲΕ͘Β͍લ͔࣌ؒΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10, termType: 0)
    

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25. Μʁ
    

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26. ςΩετ
    ͜ΕͰOK…?
    // Ҿ਺ʹ࣌ؒͷ୯ҐΛ௥Ճ
    func formattedPostDateTime(datetime: Int, termType: Int) -> String {
    switch termType {
    case 0: return "\(datetime)೔લ"
    case 1: return "\(datetime)࣌ؒલ"
    // লུ...
    default: return "গ͠લ"
    }
    }

    // Ҿ਺ʹͲΕ͘Β͍લ͔࣌ؒΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10, termType: 0) // <- 0 ͩͱ n೔લʹͳΔΜ͚ͩͬʁ n࣌ؒલʹͳΔʁ
    

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27. ੔਺Ͱ͸Θ͔Γ
    ʹ͍͘
    

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28. ͦΕENUMͰ΍
    Γ·ͤΜ͔ʁ
    

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29. ςΩετ
    ͜ΕͰ΋͍͍͚Ͳ…?
    // ࣌ؒͷ୯ҐΛද͢EnumΛ௥Ճ
    enum DateTerm {
    case day
    case hours
    case minutes
    case seconds
    }
    // Ҿ਺ʹ౉࣌ؒ͢ͷ୯ҐΛInt͔ΒDateTermʹมߋ
    func formattedPostDateTime(datetime: Int, termType: DateTerm) -> String {
    switch termType {
    case .day: return "\(datetime)೔લ"
    case .hours: return "\(datetime)࣌ؒલ"
    // লུ...
    }
    }
    // Ҿ਺ʹͲΕ͘Β͍લ͔IntͱDateTermΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10, termType: .day)
    

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30. Ͱ͖Ε͹Ҿ਺͸গͳ
    ͍ํ͕خ͍͚͠
    Ͳɾɾɾ
    

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31. ͦΕEnumͰ(ry
    

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32. ςΩετ
    ؔ࿈ܕENUMΛ࢖͑͹ɾɾɾ
    // DateTermͷϝϯόʹؔ࿈͢Δܕ(ࠓճ͸Int)Λ௥Ճ
    enum DateTerm {
    case day(Int)
    case hours(Int)
    case minutes(Int)
    case seconds(Int)
    }
    // Ҿ਺ΛDateTermҰͭʹ·ͱΊΒΕͨʂ
    func formattedPostDateTime(from term: DateTerm) -> String {
    switch term {
    case .day(let value): return “\(value)೔લ" // <- value ʹ͸10͕ೖ͍ͬͯΔ
    case .hours(let value): return "\(value)࣌ؒલ"
    // লུ…
    }
    }
    // 10೔લͱϑΥʔϚοτ
    formattedPostDateTime(from: .day(10))
    

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33. ςΩετ
    BEFORE
    // Ҿ਺ʹ࣌ؒͷ୯ҐΛ௥Ճ
    func formattedPostDateTime(datetime: Int, termType: Int) -> String {
    switch termType {
    case 0: return "\(datetime)೔લ"
    case 1: return "\(datetime)࣌ؒલ"
    // লུ...
    default: return "গ͠લ"
    }
    }

    // Ҿ਺ʹͲΕ͘Β͍લ͔࣌ؒΛ༩͑ͯϑΥʔϚοτ
    formattedPostDateTime(datetime: 10, termType: 0)
    

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34. ςΩετ
    AFTER
    enum DateTerm {
    case day(Int)
    case hours(Int)
    case minutes(Int)
    case seconds(Int)
    }
    func formattedPostDateTime(from term: DateTerm) -> String {
    switch term {
    case .day(let value): return “\(value)೔લ"
    case .hours(let value): return "\(value)࣌ؒલ"
    // লུ…
    }
    }
    formattedPostDateTime(from: .day(10))
    

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