iOSアプリでLine Heightを 設定するときに注意したいこと / Things to keep in mind when setting Line Height in your iOS app

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iOSΞϓϦͰLine HeightΛ  ઃఆ͢Δͱ͖ʹ஫ҙ͍ͨ͜͠ͱ גࣜձࣾϛΫγΟ ΈͯͶࣄۀ෦ ϩΫωϜ @_rockname

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mixi, Inc. ࣗݾ঺հ ϩΫωϜ / rockname • ϛΫγΟͰʮՈ଒ΞϧόϜΈͯͶʯͱ͍͏ΞϓϦΛ  ։ൃͯ͠Δ • iOSϝΠϯɺAndroid, RailsͳͲ΋ॻ͍ͯΔ • εϚϒϥ͕޷͖

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mixi, Inc. iOSΞϓϦͰςΩετʹLine HeightΛઃఆ͍ͨ͠ • Line HeghitʹԿ΋ઃఆ͠ͳ͔ͬͨ৔߹  ӈਤͷΑ͏ʹځ۶ͳҹ৅Λ༩͑ͯ͠·͏ • ߦؒʹద੾ͳεϖʔεΛ࣋ͨͤͯίϯςϯπΛ  ಡΈ΍͘͢ද͍ࣔͨ͠

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mixi, Inc. Line Heightͷఆٛ Line Height(Leading) = ֤ߦͷBaselineؒͷେ͖͞ https://material.io/design/typography/understanding-typography.html#type-properties

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mixi, Inc. NSParagraphStyle > lineSpacing • iOSͰߦؒΛࢦఆ͍ͨ͠৔߹͸ͪ͜ΒΛ࢖͏ • lineSpacingΛઃఆͨ͠NSParagraphStyleΛ  NSAttributedStringʹ௥Ճ͢Δ

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mixi, Inc.

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mixi, Inc. Line HeightΛઃఆ • fontSize: 25pt ʹରͯ͠ lineSpacing: 5pt Λઃఆ  (Line Height͕30ʹͳΔ͜ͱΛظ଴)

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mixi, Inc. ద੾ͳ஋͕ઃఆ͞Ε͍ͯΔ͔Λ֬ೝ • ظ଴஋ͷ30ptʹରͯ͠5ptେ͖͍Line Height • ૝ఆҎ্ͷεϖʔε͕ઃఆ͞Εͯ͠·͍ͬͯͨ

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mixi, Inc. UIFont > lineHeight • UIFontʹ͸σϑΥϧτͰlineHeight͕ઃఆ͞Ε͍ͯΔ • ͜ͷ஋Λߟྀͯ͠NSAttributedStringʹlineSpacing  Λઃఆ͢Δඞཁ͕͋ͬͨ

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mixi, Inc. ద੾ͳ஋͕ઃఆ͞Ε͍ͯΔ͔Λ֬ೝ • UIFont.font.pointSizeͱUIFont.lineHeightͱ  NSParagraphStyle.lineSpacing͸  ӈਤͷΑ͏ͳؔ܎ • ͭ·ΓɺҎԼͷΑ͏ͳ͕ࣜ੒Γཱͭ  lineSpacing = ૝ఆ͢Δߦؒ - (lineHeight - fontSize)

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mixi, Inc.

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mixi, Inc. ద੾ͳ஋͕ઃఆ͞Ε͍ͯΔ͔Λ֬ೝ • ૝ఆ௨Γ30ptͷLine HeightΛઃఆͰ͖͍ͯΔ