CoreText のはなし - Speaker Deck

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͋ ͭ CoreText ͷ͸ͳ͠ Yusuke Ito, @novi_

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֓ཁ ग़ݱ: 3.2 (iPad only) 2010/4/3 (3.0͔Β͕͋ͬͨ·ͩPrivate) ςΩετϨϯμϦϯάΤϯδϯ TextEdit, Cocoa(NSText*)Ͱ࢖ΘΕ͍ͯΔ may be Pages, iMovie, Keynote ....

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iOS ͱ OS X AttributedStringͱηοτͰ࢖͏ (ඳը͸CoreGraphics) RTLɾॎॻ͖༻άϦϑʹରԠ→ॎॻ͖ άϦϑͷஔ׵ (CTGlyphInfo) ҟମࣈʹ࢖͑Δ ϑΥϯτͷબ୒(σΟεΫϦϓλ) (CTFontDescriptor) ϑΥϯτϑΝΠϧͷύʔεɾ֤छϝλσʔλ (CTFont)

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CoreText.framework (iOS) ApplicationServices.framework/CoreText.framework (OS X) CݴޠͷΠϯλʔϑΣʔε CoreFoundationϕʔε CFTypeΛܧঝ(ͱͯ͠ৼΔ෣͏)

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NSAttributedString CFAttributedStringͱToll-free NSMutableAttributedString, CFMutableAttributedString म০จࣈ (৭ɾϑΥϯτɾߦؒ...) Λදݱ͢ΔΫϥε ෦෼จࣈྻʹରͯ͠ɺ৭(ଐੑ)ͳͲΛઃఆ͢Δ iOS4.0૬౰Ҏ্͔Β͸BlocksʹΑΔଐੑͷྻڍΛα ϙʔτ

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Ͳ͏Ͱ΋ྑ͍࿩ ☞ ౰࣌ iOS3.2 ☞ CoreText͕࢖͑ΔΑ͏ʹͳͬͨ ☞ ॎॻ͖͕Ͱ͖Δ!! (ΞςʹͳΒͳ͍υΩϡϝϯτʹΑ Δͱʣ ☞ ͔͠͠ɺग़དྷͳ͍!! ☞ Macͱಉ͡ίʔυͰ΋ग़དྷͳ͍!!

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☞ υΩϡϝϯτʹ͸ࡌ͍ͬͯΔͷʹ... (࢖͑Δͱ͸ॻ͍ ͯ͋Δ) ☞ ͍ͭ΋௨Γग़དྷͳ͍ΜͩΖ͏→ఘΊΔ ☞ ͱΓ͋͑ͣAppleʹόάϨϙ ☞ ςετίʔυΛૹΕͱݴΘΕΔ ☞ iOSͱMac༻ʹ࡞ͬͯૹΔ ☞ εΫϦʔϯγϣοτΛૹΔ ☞ ͦͯ͠ɺԻࠫଡແ͠...

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೥ޙ J04ϦϦʔεલ

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Apple: “ग़དྷͨΑʔ” ͓ͤʔΑ!!! ͱ͍͏͜ͱͰɺ ࠓ͸ॎॻ͖Ͱ͖·͢ɻ

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αϙʔτ͸͞Ε͕ͨ... ௒όΪʔͩͬͨ! ߦͷRTL(Right to Left)ɺॎॻ͖ܥ͕·ͱ΋ʹग़དྷͳ͍ RTLϞʔυͩͱάϦϑͷbounds͕͓͔͍͠ Unicodeॲཧ΋एׯ͓͔͍͠ (ؾ͕͢Δ) ೔ຊޠͱԤจϑΥϯτࠞ߹࣌ͷߦؒ໰୊ (࢓༷) ͍͔ͭ͘ͷτϦοΫͰमਖ਼Մೳ

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αϙʔτ͸͞Ε͕ͨ... ϑΥϯτσΟεΫϦϓλʹ೔ຊޠΛ৯ΘͤΔͱམͪΔ ώϥΪϊҎ֎·ͱ΋ʹϨϯμϦϯά͞Εͳ͍͜ͱ΋ (e.g.) IPA TrueType ϑΥϯτͷॎॻ͖͕·ͱ΋ʹͰ ͖ͳ͍ ԣ͸OKɺॎ͕μϝ (ϑΥϯτͷ࢓༷͔΋) FontForgeͰίϯόʔτͯ͠΋ͩΊ

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How to Use ࠶ͼ: AttributedStringͱηοτͰ࢖͏ ࣮ࡍͷඳը͸CoreGraphics (ྫ͑͹-drawRect:) View͸UIViewΛܧঝͯࣗ͠෼Ͱ࣮૷ ៉ྷͳ݁ՌΛಘΔʹ͸៉ྷͳAttributedStringΛ࡞ΕΔ ͔ɻͨͿΜϙΠϯτ͸ͬͪ͜ɻ ͱ͍͏͜ͱͰɺAttributedStringͷ͸ͳ͠

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1. Attributed StringΛ࡞Δ ଐੑ͸ Core Text String Attributes Λ࢖͏ NSAttributedStringʹCFAttributedString NSMutableAttributedStringʹCFMutableAttributedString ී௨͸Cocoa(NS)Λ࢖͑͹OK

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2. CoreTextͰϨϯμϦϯά 1Ͱ࡞੒ͨ͠NSAttributedString͔ΒCoreTextͷΦϒ δΣΫτΛ࡞੒ CTFramesetterCreateWithAttributedString ͳͲ ϨϯμϦϯά CTFramesetterCreateFrame → CTFrameʹม׵

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3. CoreGraphicsͰඳը͢Δ 1.CTFrameͷDraw(CTFrameDraw)Λ࢖͏ 2.CTLineͷDrawΛ࢖͏→ࣗ෼Ͱߦ͝ͱඳը 1.ۉ౳ἧ͑Λ͢Δͱ͖͸͜ΕΛ࢖͏ 3.CTRunͷDrawΛ࢖͏ 4.CTRun͔ΒάϦϑCGGlyphΛऔΓग़ͯ͠ɺ CGContextShowGlyphsͰඳը͢Δɻ ͍ͣΕ͔ͷํ๏Ͱඳը

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CTFrameSetter NSAttributedString CTFrame CTFont CTGlyphInfo CTParagraph Style CTLine CTLine CTLine CTRun CoreGraphics -drawRect:౳ CTLine ϨϯμϦϯά ඳը ଐੑͱͯ͠ઃఆ ॳظԽ

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׽ࣈ123 Hello World ׽ࣈ123 ... NSAttributedString Hello World CTLine ׽ ࣈ 123 CTLine CTRun

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CTFrameSetter NSAttributedString CTFrame CTLine CTLine CTLine ϨϯμϦϯά ॳظԽ ࠓ·Ͱͷ͸Α͘঺հ͞Ε͍ͯΔ ΍Γํ

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࣮ࡍCTFramesetter͸ɺ CTTypesetterΛ಺෦Ͱಈ͔͍ͯ͠Δ CTTypesetter NSAttributedString CTLine CTLine CTLine ࣗ෼ͰߦΛ࡞ͬͯ ϨϯμϦϯά ॳظԽ ΋͏Ұͭͷ΍Γํ: CTTypesetterΛ࢖͏ ී௨͸࠷ॳʹ঺հͨ͠΄͏Ͱे෼

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͜͜ͰσβΠϯύλʔϯͷ࿩Ͱ΋ ΦϒδΣΫτ͸Mutable(Մม)͔Immutable(ෆม)͔ Mutable: NSMutable..., UIView, UIViewController... Immutable: NSObject, NSString, UIImage, UIColor... NSMutableAttributedString จࣈྻࣗମ͸Immutable (-initWithString:) จࣈྻͷଐੑ͸Mutable (-setAttributes:range:) CoreText͸͢΂ͯImmutable

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CTFrameSetter NSAttributedString NSMutableAttributed... CTFrame CTFont CTGlyphInfo CTParagraph Style CTLine CTLine CTLine CTRun CTLine ϨϯμϦϯά ଐੑͱͯ͠ઃఆ ΠχγϟϥΠβʔ CTFramesetterCreateWithAttributedString CTFramesetterCr eateFrame औΓग़͠ CTFrameGetLines औΓग़͠ CTLineGetGlyphRuns Imuutable Imuutable Imuutable Imuutable Imuutable Imuutable ಈతͳมߋ͸೉͍͠ͷͰ͏·͘ઃܭ͠·͠ΐ͏ɻ

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Ͱ͖Δ or Ͱ͖ͳ͍, FAQ ϦϯΫΤϥʔ iOS͸CoreText.frameworkͷ௥Ճ(ϦϯΫ)͕ඞཁ ඳը࣌ͷαΠζ͕ཉ͍͠ CTFramesetterSuggestFrameSizeWithConstraints ۉ౳഑ஔ CTLineCreateJustiﬁedLineͰCTLineΛม׵ͯ͠ CTLine͝ͱඳը

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ը૾΍ಈը౳ΛຒΊࠐΜͰϨϯμϦϯά AttributedStringʹจࣈU+FFFCΛ௥هͯ͠ɺ kCTRunDelegateAttributeName ଐੑͰCTRunDelegateΛઃఆ ͢Δͱࢦఆͨ͠αΠζͷۭ͖ྖҬ͕Ͱ͖Δ→͜͜ʹޙͰࣗ෼Ͱ ViewΛஔ͘ ඳը࣌ʹCTRunGetAttributesͰCTRunDelegateΛऔಘ ͨͩ͠ɺView͸ࣗ෼Ͱஔ͍ͯͶ

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άϦϑͷஔ׵ kCTGlyphInfoAttributeNameଐੑͰ CTGlyphInfo Λ ηοτ લ͸iOSͰ͸ಈ͔ͳ͔͕࣮ͬͨ૷͞Εͨ ߦؒͳͲͷஈམͷઃఆ kCTParagraphStyleAttributeNameଐੑͰ CTParagraphStyle Ληοτ

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೔ຊޠͱԤจࠞࡏ࣌ʹߦ͕ؒෆࣗવ ํ๏1: ߦؒΛࣗ෼Ͱۭ͚ͳ͕ΒɺCTLine͝ͱʹඳը ํ๏2: kCTParagraphStyleSpecifierMinimumLineSpacing, kCTParagraphStyleSpecifierMaximumLineSpacing Λ0.0 ʹηοτ (͜ͷଐੑ͸υΩϡϝϯτʹࡌ͍ͬͯͳ͍ͷ Ͱ஫ҙɻϔομϑΝΠϧࢀর)

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ॎॻ͖ (࣍ͷ2ͭͷ࡞ۀ͕ඞཁ) ॎॻ͖ͷάϦϑʹ͢Δ: kCTVerticalFormsAttributeName ߦΛॎஔ͖Ͱɺӈ͔Βࠨʹඳը͢Δ: ํ๏1: kCTFrameProgressionAttributeName (LineͳͲͷboundsऔಘͰόά͕͋Δؾ͕͢Δ) ํ๏2: CGContextͰMatrix(CGAfﬁneTransform)Λ ηοτͯ͠ճసͤ͞Δ

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ςΩετΤσΟλతͳ΋ͷΛ࡞Δ UITextInput Protocol ͔Β࢝ΊΔ Text, Web, and Editing Programming Guide for iOS

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͓͢͢ΊReference ެࣜ: ATSUIΛ࢖ͬͨUnicodeςΩετඳը ΋͏άάͬͯ΋ग़ͯ͜ͳ͍͕ɺWebArchiveʹ͋ͬͨɻ http://bit.ly/Hh7sP3 ެࣜ: Core Text Reference Attributed String Programming Guide Core Text String Attributes Reference NSMutableAttributedString Class Reference Strings Programming Guide for Core Foundation

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Reference 2 WWDC Video #110, 2010, Advanced Text Handling for iPhone OS #114, 2010, Advanced Cocoa Text Tips and Tricks #128, 2011, Advanced Text Processing Google ݕࡧ: “coretext ﬁletype:pdf” “attributed string ﬁletype:pdf” SlideShare, SpeakerDeck Github

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LTCoreText ͦΕͳΓʹܰྔ ϖʔδϯά/ ஈ૊Έ ॎஔ͖/ॎॻ͖ ΧελϜϏϡʔ౳ͷຒΊࠐΈ ಈతͳϖʔδૠೖɾ࡟আ ඇಉظϨΠΞ΢τॲཧ https://github.com/novi/LTCoreText ͓·͚: LTGridView ్த͚ͩͲGridViewͷϥΠϒϥϦ ެ։தͷϥΠϒϥϦ

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demo LTCoreText

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Thank you ❡ https://github.com/novi http://speakerdeck.com/u/yusukeito http://about.me/yusukeito

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Appendix: RetinaͱCoreText Retinaͩͱएׯจࣈ͕ࡉ͘ݟ͑Δ (ͱࢥ͏) αϒϐΫηϧϨϯμϦϯάͷON/OFFʹΑͬͯ΋ҧ͏ Retina/ඇRetina, αϒϐΫηϧϨϯμϦϯάON/OFF ͷ4ύλʔϯ Mac͸σϑΥϧτON, iOS͸OFF ͝·͔͕͠ޮ͔ͳ͍ͷͰϑΥϯτͷ඼࣭͕෼͔Δ ώϥΪϊͷ͸͔ͬ͠Γ࡞ͬͯ͋Δҹ৅