Core Text Programming Guide

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1、CoreTextProgrammingGuideContentsIntroduction4OrganizationofThisDocument4SeeAlso4CoreTextOverview6OSXTextTechnologies6DesignGoalsandPrinciples7CoreTextFeaturesandCapabilities8SystemDataTypesandServices8CoreTextInput8CharactersandGlyphs9CoreTextObjects10LayoutObjects10FontObjects13CommonOper

2、ations15SimpleParagraphs15SimpleTextLabels16ColumnarLayout17ManualLineBreaking20FontCreationandStorage21AccessingFontMetrics25CreatingRelatedFonts27DocumentRevisionHistory292010-03-03

3、Copyright©2010AppleInc.AllRightsReserved.2FiguresandListingsCoreTextOverview6Figure1-1Glyphsofthecharacter

4、A9Figure1-2Ligatures9Figure1-3Textlayoutdataflow10Figure1-4Aframeobjectcontaininglinesandglyphruns12Figure1-5Creatingafontfromafontdescriptor14CommonOperations15Listing2-1Typesettingasimpleparagraph15Listing2-2Typesettingasimpletextlabel17Listing2-3Performingcolumnartextlayout18Listing2-4P

5、erformingmanuallinebreaking20Listing2-5Creatingafontdescriptorfromanameandpointsize21Listing2-6Creatingafontdescriptorfromafamilyandtraits21Listing2-7Creatingafontfromafontdescriptor23Listing2-8Serializingafont23Listing2-9Creatingafontfromserializeddata24Listing2-10Calculatinglineheight26L

6、isting2-11Gettingglyphsforcharacters26Listing2-12Changingtraitsofafont27Listing2-13Convertingafonttoanotherfamily282010-03-03

7、Copyright©2010AppleInc.AllRightsReserved.3IntroductionCoreTextisanadvanced,low-leveltechnologyforlayingouttextandhandlingfonts.Itisdesignedforhighperformanceandease

8、ofuse.TheCoreTextAPI,introducedinOSXv10.5,isaccessiblefromallOSXapplicationenvironments.ItisalsoavailableiniOS3.2.TheCoreTextlayoutengineisdesignedspecificallytomakesimpletextlayoutoperationseasytodoandtoavoidsideeffects.TheCoreTextfontprogramminginterfaceiscomplementarytotheCoreTextlayout

9、engineandisdesignedtohandleUnicodefontsnatively,unifyingdisparateOSXfontfacilitiesintoasinglecomprehensiveprogramminginterface.Thisdocumentisintendedfordeveloperswhoneedtodotextlayoutandfonthandlingatalowlevel.Ifyoucandevelopyourapplicationusinghigher-levelcon