Data Formatting Guide for Core Foundation

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1、DataFormattingGuideforCoreFoundationContentsIntroductiontoDataFormattingGuideforCoreFoundation4CreatingandUsingCFDateFormatterObjects5CreatingDateFormatters5UseFormatterStylestoPresentDatesandTimesWiththeUser’sPreferences5UseFormatStringstoSpecifyCustomFormats8FixedFormats8CustomFormatsfo

2、rUser-VisibleDates9CreatingandUsingCFNumberFormatterObjects11CreatingNumberFormatters11UsingNumberFormatStyles13CustomFormatterProperties15DocumentRevisionHistory172011-03-08

3、Copyright©2011AppleInc.AllRightsReserved.2ListingsCreatingandUsingCFDateFormatterObjects5Listing1Comparingdateform

4、atstyles7CreatingandUsingCFNumberFormatterObjects11Listing1Codesampleshowinghowtocreateanumberformatterusingaformatterstyle11Listing2Codesampleshowinghowtocreateanumberformatterusingaformatterstring12Listing3Comparingnumberformatstyles13Listing4Usingnumberformatstrings152011-03-08

5、Copyrig

6、ht©2011AppleInc.AllRightsReserved.3IntroductiontoDataFormattingGuideforCoreFoundationFormattersdefineacommoninterfaceforcreating,interpreting,andvalidatingthetextualrepresentationofobjects.TheCoreFoundationprovidestwoopaquetypes,CFDateFormatterandCFNumberFormatter,thatyouusetoformatdatesa

7、ndnumbersrespectively.TheFoundationframeworkprovidestwoanalogousclasses,NSDateFormatterandNSNumberFormatter.AlthoughtheformatterobjectsinCoreFoundationandFoundationaresimilar,theyarenottoll-freebridged.ThisdocumentassumesyouarefamiliarwiththeconceptspresentedinDataFormattingGuide.●“Creati

8、ngandUsingCFDateFormatterObjects”(page5)describeshowtocreateandusedateformatters.●“CreatingandUsingCFNumberFormatterObjects”(page11)describeshowtocreateandusenumberformatters.2011-03-08

9、Copyright©2011AppleInc.AllRightsReserved.4CreatingandUsingCFDateFormatterObjectsDateformattersformatthe

10、textualrepresentationofdateobjectsandconverttextualrepresentationsofdatesandtimesintodateobjects.Youcreatedateformatterobjectsbyspecifyingalocale(typicallytheuser'scurrentlocale)andatimestyle,youcanalsospecifyacustomformatstring.CreatingDateFormattersYoucreateadatef