Rangeと仲良くなる15分 with String.Index & Unicode

Understanding Range of iOS with String.Index & Unicode
iOSDC2017

9/17 15:10
@早稲田大学理工学部　西早稲田キャンパス 63号館

Transcript

1. Copyright © 2017 eureka, Inc. All rights reserved. Understanding Range of iOS Rangeͱ஥ྑ͘ͳΔ15෼
2. ࢿྉΛ࡞͍ͬͯͯൃ֮
3. String.Indexͱ஥ྑ͘ͳΒͳ͍ͱ Rangeͱ஥ྑ͘Ͱ͖ͳ͍
4. Copyright © 2017 eureka, Inc. All rights reserved. Understanding Range of iOS with String.Index & Unicode Rangeͱ஥ྑ͘ͳΔ15෼ with String.Index & Unicode
5. Copyright © 2017 eureka, Inc. All rights reserved. 5 Introduce  FVSFLB
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6. Copyright © 2017 eureka, Inc. All rights reserved. 6 ͜ͷSessionͷ໨ඪ  4XJGU3BOHFɺ/43BOHFͷجૅʹ͍ͭͯཧղ͢Δ
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7. Copyright © 2017 eureka, Inc. All rights reserved. 7 ͜ͷSessionͷ໨ඪ  จࣈྻૢ࡞࣌ͷ3BOHFͱ஥ྑ͘ͳΔ
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9. Copyright © 2017 eureka, Inc. All rights reserved. Basic of Swift.Range Rangeͷجຊ
10. Copyright © 2017 eureka, Inc. All rights reserved. 10 Swift.Rangeͷجຊ  3BOHF#PVOE
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11. Copyright © 2017 eureka, Inc. All rights reserved. 11 Swift.Range )BMG0QFO
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12. Copyright © 2017 eureka, Inc. All rights reserved. 12 Countable or UnCountable ? // Countable let countableRange1 = 0...0 let countableRange2 = 10..<100 // UnCountable let unCountableRange1 = 0.2...19.5 let unCountableRange2 = 0..<20.0
13. Copyright © 2017 eureka, Inc. All rights reserved. 13 Countable or UnCountable ? // Countable let countableRange1 = 0...0 let countableRange2 = 10..<100 // UnCountable let unCountableRange1 = 0.2...19.5 let unCountableRange2 = 0..<20.0
14. Copyright © 2017 eureka, Inc. All rights reserved. 14 Countable or UnCountable ?  $PVOUBCMF
    
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15. Copyright © 2017 eureka, Inc. All rights reserved. 15 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)? // Range(半開区間) let range1 = 0..<10 let range2 = 0.0..<10.0 // ClosedRange(閉区間) let closedRange1 = 0...10 let closedRange2 = 0.0...10.0
16. Copyright © 2017 eureka, Inc. All rights reserved. 16 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)? // Range(半開区間) let range1 = 0..<10 let range2 = 0.0..<10.0 // ClosedRange(閉区間) let closedRange1 = 0...10 let closedRange2 = 0.0...10.0
17. Copyright © 2017 eureka, Inc. All rights reserved. 17 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)?  $MPTFE3BOHFVQQFS#PVOE
    
    
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     DPOUBJOT *OUNBY
18. Copyright © 2017 eureka, Inc. All rights reserved. 18 Swift.Range )BMG0QFO
    ൒։۠ؒ $MPTFE
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    #PVOE
19. Copyright © 2017 eureka, Inc. All rights reserved. 19 Swift 4 - PartialRange  ࠨӈ͍ͣΕ͔ͷ୺఺ #PVOE ͕ଘࡏ͠ͳ͍3BOHF let range1 = 0... // CountablePartialRangeFrom let range2 = 0.5... // PartialRangeFrom let range3 = ...100 // PartialRangeThrough let range4 = ..<100.0 // PartialRangeUpTo
20. Copyright © 2017 eureka, Inc. All rights reserved. 20 Swift 4 - PartialRange let target = 50 switch target { case 100...: print("greater than 100") case ..<100: print("less than 100") default: print(“default") } // > less than 100
21. Copyright © 2017 eureka, Inc. All rights reserved. 21 NSRange  MPDBUJPOͱMFOHUIΛ࣋ͭ
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22. Copyright © 2017 eureka, Inc. All rights reserved. Range with String.Index Range with String.Index
23. Copyright © 2017 eureka, Inc. All rights reserved. String.IndexΊΜͲ͍໰୊
24. Copyright © 2017 eureka, Inc. All rights reserved. 24 slice String let array = ["❤", "#", "❤", "$", "%", "&"] let familyLove = array[1...2] // ["#", “❤"] let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let substring2 = string[targetStart..<targetEnd] // ↓Swift 4からDeprecated //let substring = string.substring(with: targetStart..<targetEnd)
25. Copyright © 2017 eureka, Inc. All rights reserved. 25 slice String let array = ["❤", "#", "❤", "$", "%", "&"] let familyLove = array[1…2] // ["#", “❤"] let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let substring2 = string[targetStart..<targetEnd] // ↓Swift 4からDeprecated //let substring = string.substring(with: targetStart..<targetEnd)
26. Copyright © 2017 eureka, Inc. All rights reserved. 26 slice with PartialRange string.substring(to: targetEnd) // Deprecated! string[..<targetEnd] string.substring(from: targetStart) // Deprecated! string[targetStart...]
27. Copyright © 2017 eureka, Inc. All rights reserved. 27 slice with PartialRange string.substring(to: targetEnd) // Deprecated! string[..<targetEnd] string.substring(from: targetStart) // Deprecated! string[targetStart...]
29. Copyright © 2017 eureka, Inc. All rights reserved. 29 why String.Index?  lߴίετͳॲཧͰ͋Δ͜ͱΛҙࣝͤ͞ɺ͔ͭޮ཰ͷྑ͍ཁૉΞΫηε͕Մ ೳͳ"1*ͱͳ͍ͬͯΔ͜ͱz
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30. Copyright © 2017 eureka, Inc. All rights reserved. 30 why String.Index?  /44USJOHʹ͓͚Δ65'Τϯίʔυ΍ɺ65'7JFXͳͲ֤छΤϯίʔυ 7JFXͱॻهૉΫϥελͷࠩҟΛҙࣝͤ͞Δ
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32. Copyright © 2017 eureka, Inc. All rights reserved. Characters
33. Copyright © 2017 eureka, Inc. All rights reserved. 33 Unicodeͷجૅ Character View let string = "résumé〜" string.utf8.count // 15 string.utf16.count // 9 string.unicodeScalars.count // 8 string.characters.count // 8 (string as NSString).length // 9
34. Copyright © 2017 eureka, Inc. All rights reserved. 34 UTF8View r é s u m é 〜 72 c3 a9 73 75 6d c3 a9 e3 9c 80 f0 9f 84 98 for view in string.utf8 { print(String(view, radix: 16)) }
35. Copyright © 2017 eureka, Inc. All rights reserved. 35 UTF16View r é s u m é 〜 72 e9 73 75 6d e9 301c d83d de04 for view in string.utf16 { print(String(view, radix: 16)) }
36. Copyright © 2017 eureka, Inc. All rights reserved. 36 UnicodeScalarView r é s u m é 〜 72 e9 73 75 6d e9 301c 1f604 for view in string.unicodeScalars { print(String(view.value, radix: 16)) }
37. Copyright © 2017 eureka, Inc. All rights reserved. 37 ʮ1จࣈʯͱ͸  Ϣʔβ͕ೝࣝ͢Δʮจࣈʯ͸ɺ6OJDPEFͷίʔυϙΠϯτ͕ෳ਺૊Έ߹Θ ͤͯߏ੒͞ΕΔࣄ΋͋Δ
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38. Copyright © 2017 eureka, Inc. All rights reserved. 38 ֦ுॻهૉΫϥελ  4USJOHDIBSBDUFST
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39. Copyright © 2017 eureka, Inc. All rights reserved. 39 ֦ுॻهૉΫϥελ ڥքϧʔϧ 1. ςΩετ͕ۭͰͳ͍ݶΓɺςΩετͷઌ಄ͱ࠷ޙ͸ڥքʹͳΔ 2. CRͱLFͷؒ͸ڥքʹͳΒͳ͍ɻ΋͘͠͸ɺControlɺCRɺLFͷલޙΛڥքʹ͢Δ 3. ϋϯάϧͷԻઅγʔέϯε͕ଓ͘৔߹͸ڥքʹͳΒͳ͍ 4. ZWJ΍֦ுΩϟϥΫλͷલ͸ڥքʹͳΒͳ͍ 5. SpacingMarkͷલɺ΋͘͠͸ઌ಄௥Ճจࣈͷޙ͸ڥքʹͳΒͳ͍ 6. Emoji Modifier Sequenceɺ΋͘͠͸ZWJΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 7. ࠃضֆจࣈΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 8. ্هͷ৚݅ʹؚ·Εͳ͍৔߹ɺڥքʹͳΔ http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries
40. Copyright © 2017 eureka, Inc. All rights reserved. 40 ֦ுॻهૉΫϥελ ڥքϧʔϧ 1. ςΩετ͕ۭͰͳ͍ݶΓɺςΩετͷઌ಄ͱ࠷ޙ͸ڥքʹͳΔ 2. CRͱLFͷؒ͸ڥքʹͳΒͳ͍ɻ΋͘͠͸ɺControlɺCRɺLFͷલޙΛڥքʹ͢Δ 3. ϋϯάϧͷԻઅγʔέϯε͕ଓ͘৔߹͸ڥքʹͳΒͳ͍ 4. ZWJ΍֦ுΩϟϥΫλͷલ͸ڥքʹͳΒͳ͍ 5. SpacingMarkͷલɺ΋͘͠͸ઌ಄௥Ճจࣈͷޙ͸ڥքʹͳΒͳ͍ 6. Emoji Modifier Sequenceɺ΋͘͠͸ZWJΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 7. ࠃضֆจࣈΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 8. ্هͷ৚݅ʹؚ·Εͳ͍৔߹ɺڥքʹͳΔ http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries ཁ͢ΔʹΊΜͲ͍ʂ
41. Copyright © 2017 eureka, Inc. All rights reserved. NSRange × Swift.Range in String
42. Copyright © 2017 eureka, Inc. All rights reserved. 42 NSੈքʹ͓͚ΔString Range  /44USJOH͸65'
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43. Copyright © 2017 eureka, Inc. All rights reserved. 43 NSString slice // 1文字目を取得する let string = "こんにちは！" let startIndex = string.startIndex let endIndex = string.index(startIndex, offsetBy: 1) string[startIndex..<endIndex] // "" let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: 1)) // “U+FFFD"
44. Copyright © 2017 eureka, Inc. All rights reserved. 44 NSString substring // 1文字目を取得する let string = "こんにちは！" let startIndex = string.startIndex let endIndex = string.index(startIndex, offsetBy: 1) string[startIndex..<endIndex] // "" let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: 1)) // “U+FFFD”
45. Copyright © 2017 eureka, Inc. All rights reserved. 45 String.Index  65'ͷίʔυϙΠϯτͱͯ͠ʮʯ͸͕ͭͩɺ4USJOH*OEFY͸ॻهૉ ΫϥελΛߟྀ
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46. Copyright © 2017 eureka, Inc. All rights reserved. 46 Swift 3ʹ͓͚ΔSwift.Range to NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance))
47. Copyright © 2017 eureka, Inc. All rights reserved. 47 Swift 3ʹ͓͚ΔSwift.Range > NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance))
48. Copyright © 2017 eureka, Inc. All rights reserved. 48 Swift 3ʹ͓͚ΔSwift.Range > NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance)) // ""
49. Copyright © 2017 eureka, Inc. All rights reserved. 49 Swift 4 let range = NSRange(startIndex..<endIndex, in: string) (string as NSString).substring(with: range) // ""  /43BOHF SFHJPO
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50. Copyright © 2017 eureka, Inc. All rights reserved. Swift 4ͰRangeٴͼStringपΓ ͍Ζ͍Ζߋ৽͞Ε͍ͯΔ݅
51. Copyright © 2017 eureka, Inc. All rights reserved. 51 Swift 4  4XJGU
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52. Copyright © 2017 eureka, Inc. All rights reserved. 52 Swift 4 - Unicode 9 ʹରԠ  4XJGU
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53. Copyright © 2017 eureka, Inc. All rights reserved. 53 Swift 3ͷ৔߹ // 1文字目を取得 let emoji = “-家族" let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex..<endIndex]
54. Copyright © 2017 eureka, Inc. All rights reserved. 54 Swift 3ͷ৔߹ // 1文字目を取得 let emoji = “-家族" let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex..<endIndex] // -> ""
55. Copyright © 2017 eureka, Inc. All rights reserved. 55 Swift 3ͷ৔߹ // 1文字目を取得 let emoji = “-家族" let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex..<endIndex] // -> ""
56. Copyright © 2017 eureka, Inc. All rights reserved. 56 Unicode - ZWJ 0
    
    
    
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57. Copyright © 2017 eureka, Inc. All rights reserved. 57 Swift 4 supports Unicode 9 // 1文字目を取得 let emoji = “-家族" emoji.count // 3 let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex..<endIndex] // -> "-"
58. Copyright © 2017 eureka, Inc. All rights reserved. 58 Swift 4 supports Unicode 9 // 1文字目を取得 let emoji = “-家族" emoji.count // 3 let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex..<endIndex] // -> "-"
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59. Copyright © 2017 eureka, Inc. All rights reserved. 59 Swift 4 SubString͕௥Ճ let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let subString = string[targetStart..<targetEnd] subString.startIndex // 2 (Swift 3の場合、 startIndex == 0)
60. Copyright © 2017 eureka, Inc. All rights reserved. 60 Swift 4 - Substring  4XJGU
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61. Copyright © 2017 eureka, Inc. All rights reserved. 61 Substring to String let subString = string[targetStart..<targetEnd] subString.startIndex // 2 // initializerを使う String(subString).startIndex // 0
62. Copyright © 2017 eureka, Inc. All rights reserved. 62 ·ͱΊ  4XJGUͷ3BOHF͸͍͔ͭ͘ଘࡏ͢Δ͕ɺ֤3BOHFͷಛ௃Λཧղ
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63. ʊਓਓਓਓਓਓਓਓਓʊ
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64. Thank you IUUQTXXXOBTBHPWNJTTJPO@QBHFT/11OFXTFBSUIBUOJHIUIUNM