SwiftのEnum Associated Valuesを Kotlinでエミュレートしたい

Transcript

1. Ո଒ͷຖ೔Λ΋ͬͱসإʹɻ 4XJGUͷ&OVN
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   ,PUMJOͰΤϛϡϨʔτ͍ͨ͠ ίωώτגࣜձࣾ

2. ෋ా݈ೋ !UPNNZLX !UPNNZLX ίωώτגࣜձࣾ
   "OESPJE
   &OHJOFFS ϓϩϑΟʔϧ

3. ΞδΣϯμ w 4XJGU
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   w ,PUMJOͰΤϛϡϨʔτ͢Δํ๏
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4. Ո଒ͷຖ೔Λ΋ͬͱসإʹɻ 4XJGU
   &OVN
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5. ͦ΋ͦ΋Կʁ 4XJGU
   &OVN
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6. 4XJGUͷ&OVNܕʹͯ೚ҙͷܕΛ֨ೲ͢ Δ͜ͱ͕Ͱ͖·͢ 4XJGU
   &OVN
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7. enum ListItemType { case header(Int, String) case row1(Int, String, Int)

   case row2(Int, String) case row3(Int, String) case footer(Int, String) } 4XJGU
   &OVN 4XJGU
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8. ศརʂʂ 4XJGU
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9. ,PUMJO͸ʜ 4XJGU
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10. enum class ListItemType(val id: Int, val title: String) {
 HEADER(1,

    "header"),
 ROW1(2, "row1"),
 ROW2(3, "row2"),
 ROW3(4, "row3"),
 FOOTER(5, "footer"),
 } ,PUMJO
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11. enum class ListItemType(val id: Int, val title: String) {
 HEADER(1,

    "header"),
 ROW1(2, "row1", “image_url"), // ίϯύΠϧΤϥʔ
 ROW2(3, "row2"),
 ROW3(4, "row3"),
 FOOTER(5, "footer"),
 } ,PUMJO
    &OVN 4XJGU
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12. ,PUMJOʹ͸&OVN
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13. ͪͳΈʹ4XJGU͚ͩͰͳ͘ɺଞݴޠͰ͸όϦΞϯ τܕͱ͍͏ܕͰಉ༷ͷػೳΛ࣮ݱͰ͖ΔΑ͏Ͱ ͢ 4XJGU
    &OVN
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14. ϦετͷϏϡʔλΠϓ΍ΠϕϯτλΠϓΛ ಉ༷ͷػೳΛ࢖ͬͯ,PUMJOͰ؅ཧ͍ͨ͠ʂ 4XJGU
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    7BMVFTͱ͸

15. Ո଒ͷຖ೔Λ΋ͬͱসإʹɻ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

16. "OESPJE։ൃʹ͓͍ͯɺ3FDZDMFS7JFXͷ ෳ਺ϏϡʔλΠϓΛͲ͏΍ͬͯ؅ཧͯ͠ ͍·͔͢ʁ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

17. ϕʔεͱͳΔجఈΫϥεΛ࡞ΓɺͦΕ Λجʹͨ͠αϒΫϥεͰ؅ཧ͢Δ ΞϓϩʔνʢجఈΫϥεʣ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

18. ΞϓϩʔνʢجఈΫϥεʣ open class BaseListItem(
 open val id: Int,
 open val

    title: String
 )
 
 data class ListItem1(
 override val id: Int,
 override val title: String,
 val mainImageUrl: Int
 ) : BaseListItem(id, title)
 
 data class ListItem2(
 override val id: Int,
 override val title: String,
 val mainImageUrl: String,
 val subImageUrl: String
 ) : BaseListItem(id, title) ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

19. ΞϓϩʔνʢλΠϓ෼͚ʣ λΠϓΫϥεΛ࡞ͬͯ؅ཧ͢Δ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

20. ΞϓϩʔνʢλΠϓ෼͚ʣ enum class ListItemType {
 HEADER, ROW1, ROW2, ROW3, FOOTER


    }
 
 data class ListItem(val id: String = "",
 val title: String = "",
 val type: ListItemType = ListItemType.HEADER)
 ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

21. 4XJGUΈ͍ͨʹ&OVNͰ؅ཧͯ͠Έ͍ͨ ͳʜ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

22. ,PUMJOͰ΋ͬͱ؆୯ʹͰ͖ͳ͍͔ͳʜ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

23. 4FBMFE
    $MBTT ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

24. 4FBMFE
    $MBTT͸ܧঝΛ੍ݶͰ͖ɺωετ͠ ͨΫϥε΍ΦϒδΣΫτʹରͯ͠ར༻Ͱ͖Δ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

25. ྻڍܕΛ&OVNͰ͸ͳ͘ɺ4FBMFE
    $MBTTͰදݱ͢Δ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

26. sealed class ListItemType {
 class Header(val id: Int, val title:

    String) : ListItemType()
 class Footer(val id: Int, val title: String) : ListItemType()
 } ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

27. 3FMBYFE
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28. ,PUMJO͔Β4FBMFE
    $MBTTͰ%BUB
    $MBTTΛར༻Ͱ͖ΔΑ͏ʹͳΓ·ͨ͠ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

29. sealed class ListItemType {
 data class Header(val id: Int, val

    title: String) : ListItemType()
 data class Row1(val id: Int, val title: String, val imageUrl: String) : ListItemType()
 data class Row2(val id: Int, val title: String) : ListItemType()
 data class Row3(val id: Int, val title: String) : ListItemType()
 data class Footer(val id: Int, val title: String) : ListItemType()
 } ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

30. %BUB
    $MBTTʹ͸ɺFRVBMTɺIBTI$PEFɺ DPNQPOFOUɺDPQZͳͲ͕͋ͬͯศརʂ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

31. %BUB
    $MBTT͸σʔλͷ੔߹ੑΛकΔͨ ΊʹҾ਺͕ඞཁͱͳΓ·͢ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

32. sealed class ListItemType {
 data class Header(val id: Int, val

    title: String) : ListItemType()
 data class Row1(val id: Int, val title: String, val imageUrl: String) : ListItemType()
 data class Row2(val id: Int, val title: String) : ListItemType()
 data class Row3(val id: Int, val title: String) : ListItemType()
 data class Footer() : ListItemType() // ίϯύΠϧΤϥʔ
 } ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

33. Ҿ਺ͷͳ͍΋ͷʹ͍ͭͯ͸ɺ$MBTTͰ ఆٛ͢Ε͹ྑͦ͞͏ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

34. sealed class ListItemType {
 data class Header(val id: Int, val

    title: String) : ListItemType()
 data class Row1(val id: Int, val title: String, val imageUrl: String) : ListItemType()
 data class Row2(val id: Int, val title: String) : ListItemType()
 data class Row3(val id: Int, val title: String) : ListItemType()
 class Footer() : ListItemType()
 } ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

35. ϦετͷϏϡʔλΠϓ΍ΠϕϯτλΠ ϓͷ؅ཧָ͕ʹͳΓ·͢Ͷʂ ,PUMJOͰΤϛϡϨʔτ͢Δʹ͸

36. Ո଒ͷຖ೔Λ΋ͬͱসإʹɻ ·ͱΊ

37. 4XJGU
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38. Ո଒ͷຖ೔Λ΋ͬͱসإʹɻ ίωώτגࣜձࣾ ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠