Core Animation Cookbook

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1、CoreAnimationCookbookContentsCoreAnimationCookbook4OrganizationofThisDocument4SeeAlso4Drawing5DrawingLayerContentWithApplicationKitClasses5Timing7UsingaSingleTimingFunctionForaKeyframeAnimation7DocumentRevisionHistory92008-03-11

2、Copyright©2008AppleInc.AllRightsReserved.2Li

3、stingsDrawing5Listing1DrawingintoalayerusingApplicationKitclasses5Timing7Listing1Usingasingletimingfunctionforakeyframeanimation72008-03-11

4、Copyright©2008AppleInc.AllRightsReserved.3CoreAnimationCookbookThisdocumentprovidesinstructionsandcodefragmentsthatdescribehowtoperfo

5、rmcommonCoreAnimationtasks.OrganizationofThisDocumentThisdocumenthasthefollowingchapters:●“Drawing”(page5)describesvariousdrawingtechniqueswhenworkingwithlayers.●“Timing”(page7)describesvarioustimingtechniqueswhenworkingwithanimations.SeeAlsoTheseprogrammingguidesdiscussso

6、meofthetechnologiesthatareusedbyCoreAnimation:●CoreAnimationProgrammingGuidedescribestheCoreAnimationtechnologyandshowshowtousetheCoreAnimationAPI.●Quartz2DProgrammingGuidedescribesthetwo-dimensionaldrawingengineusedtodrawthecontentofanCALayerinstance.●CoreImageProgramming

7、GuidedescribestheOSXimageprocessingtechnologyandshowshowtousetheCoreImageAPI.2008-03-11

8、Copyright©2008AppleInc.AllRightsReserved.4DrawingThischapterdiscussesdrawingissueswhenusingCoreAnimationandothertechnologies.DrawingLayerContentWithApplicationKitClassesCoreAnimationCAL

9、ayerclassdefinesadelegatemethod,drawLayer:inContext:,thatyoucanimplementanddrawyourlayercontentusingQuartz2Ddrawingfunctions.However,CocoadeveloperswhohavecompleteandworkingdrawingsolutionsbasedontheApplicationKitdrawingclassesmaywishtocontinueusingthatcode.Listing1showsan

10、implementationoftheCALayerdelegatemethoddrawLayer:inContext:thatcreatesanNSGraphicsContextfromtheCGContextRefpassedastheinContext:parameter.LayerdelegatescanusethistechniquetodisplaycontentcreatedusingNSBezierPath,NSColor,NSImageandotherApplicationKitclasses.Listing1Drawin

11、gintoalayerusingApplicationKitclasses-(void)drawLayer:(CALayer*)layerinContext:(CGContext