SwiftのStringの文字の数え方を完全理解する

by Takanori Hirobe

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SwiftͷStringͷจࣈͷ ਺͑ํΛ׬શཧղ͢Δ Takanori Hirobe @taka1068

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• ኍ෦ وಙ • ϑΣϯϦϧגࣜձࣾॴଐ ࣗݾ঺հ

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ࣗݾ঺հ • ኍ෦ وಙ • ϑΣϯϦϧגࣜձࣾॴଐ ΰʔϧυεϙϯαʔ

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ࣗݾ঺հ • ኍ෦ وಙ • ϑΣϯϦϧגࣜձࣾॴଐ ΰʔϧυεϙϯαʔ Ϙτϧ΢Υʔλʔεϙϯαʔ

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ࣗݾ঺հ • ኍ෦ وಙ • ϑΣϯϦϧגࣜձࣾॴଐ ΰʔϧυεϙϯαʔ Ϙτϧ΢Υʔλʔεϙϯαʔ

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ΞδΣϯμ - SwiftͷStringʹ͍ͭͯ - Unicodeʹ͍ͭͯ - Stringͱཁૉͷஔ͖׵͑ʹ͍ͭͯ

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ΞδΣϯμ -SwiftͷStringʹ͍ͭͯ - Unicodeʹ͍ͭͯ - Stringͱཁૉͷஔ͖׵͑ʹ͍ͭͯ

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print("Hello, iOSDC!")

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String

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String Value Type Bridges to NSString

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String Value Type UTF-8 Encoded Hashable Bridges to NSString

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String Value Type UTF-8 Encoded Equatable Hashable Bridges to NSString Collection

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String Value Type UTF-8 Encoded Equatable Hashable Bridges to NSString Collection

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Collection

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑"

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" let first = array[0]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" let first = array[0] let first = array[array.startIndex] or better

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" let first = array[0]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" let first = array[0] Int ഑ྻͷཁૉͷܕ

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int let first = string[0]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int let first = string[0]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int let first = string[string.startIndex]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int let first = string[string.startIndex] String.Index Character

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int let startIdx = str.startIndex let index = str.index(startIdx, offsetBy: 5) let fifthChar = str[index]

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character

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Collection var array = [ , 20, 30, 40, 50] var string = “ bc͍͋͏͓͑” ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character 10 Λ 100 ʹม͑Δ a Λ X ʹม͑Δ a 10

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Collection X 100 var array = [ , 20, 30, 40, 50] var string = “ bc͍͋͏͓͑” ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character

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Collection var array = [100, 20, 30, 40, 50] var string = "Xbc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character array[0] = 100

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Collection var array = [100, 20, 30, 40, 50] var string = "Xbc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character array[0] = 100 "

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Collection var array = [100, 20, 30, 40, 50] var string = "Xbc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character

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Collection var array = [100, 20, 30, 40, 50] var string = "Xbc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character string[string.startIndex] = "X"

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Collection var array = [100, 20, 30, 40, 50] var string = "Xbc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character string[string.startIndex] = "X" #

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈʹΑΔมߋ: OK ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character ఴࣈʹΑΔมߋ: NG

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Collection let array = [10, 20, 30, 40, 50] let string = "abc͍͋͏͓͑" ఴࣈΞΫηε: Int ཁૉͷܕ: Int ఴࣈʹΑΔมߋ: OK ఴࣈΞΫηε: String.Index ཁૉͷܕ: Character ఴࣈʹΑΔมߋ: NG count͸5 count͸8

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ಉ͡Collectionͱ͍ͬͯ΋ѻ͍ํ ͕গ͠ҧ͏ - Stringͷํ͕ѻ͍ʹ͍͘

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ΞδΣϯμ - SwiftͷStringʹ͍ͭͯ -Unicodeʹ͍ͭͯ - Stringͱཁૉͷஔ͖׵͑ʹ͍ͭͯ

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ʮͺʯͱ͍͏จࣈΛ  UnicodeͰද͢ ྫ

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ͺ ͺ let pa1 = “…” let pa2 = “…” print(pa1, pa2) // ͺ ͺ

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ͺ ͺ let pa1 = “…” let pa2 = “…” print(pa1, pa2) // ͺ ͺ

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