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1、WelcometoSwift2AboutSwiftSwiftisanewprogramminglanguageforiOSandOSXappsthatbuildsonthebestofCandObjective-C,withouttheconstraintsofCcompatibility.Swiftadoptssafeprogrammingpatternsandaddsmodernfeaturestomakeprogrammingeasier,moreflexible,andmorefun.Swift’scleanslate,backedbythematureandmu
2、ch-lovedCocoaandCocoaTouchframeworks,isanopportunitytoreimaginehowsoftwaredevelopmentworks.Swifthasbeenyearsinthemaking.ApplelaidthefoundationforSwiftbyadvancingourexistingcompiler,debugger,andframeworkinfrastructure.WesimplifiedmemorymanagementwithAutomaticReferenceCounting(ARC).Ourframe
3、workstack,builtonthesolidbaseofFoundationandCocoa,hasbeenmodernizedandstandardizedthroughout.Objective-Citselfhasevolvedtosupportblocks,collectionliterals,andmodules,enablingframeworkadoptionofmodernlanguagetechnologieswithoutdisruption.Thankstothisgroundwork,wecannowintroduceanewlanguage
4、forthefutureofApplesoftwaredevelopment.SwiftfeelsfamiliartoObjective-Cdevelopers.ItadoptsthereadabilityofObjective-C’snamedparametersandthepowerofObjective-C’sdynamicobjectmodel.ItprovidesseamlessaccesstoexistingCocoaframeworksandmix-and-matchinteroperabilitywithObjective-Ccode.Buildingfr
5、omthiscommonground,Swiftintroducesmanynewfeaturesandunifiestheproceduralandobject-orientedportionsofthelanguage.Swiftisfriendlytonewprogrammers.Itisthefirstindustrial-qualitysystemsprogramminglanguagethatisasexpressiveandenjoyableasascriptinglanguage.Itsupportsplaygrounds,aninnovativefeat
6、urethatallowsprogrammerstoexperimentwithSwiftcodeandseetheresultsimmediately,withouttheoverheadofbuildingandrunninganapp.SwiftcombinesthebestinmodernlanguagethinkingwithwisdomfromthewiderAppleengineeringculture.Thecompilerisoptimizedforperformance,andthelanguageisoptimizedfordevelopment,w
7、ithoutcompromisingoneither.It’sdesignedtoscalefrom“hello,world”toanentireoperatingsystem.AllthismakesSwiftasoundfutureinvestmentfordevelopersandforApple.SwiftisafantasticwaytowriteiOSandOSXapps,andwillcontinuetoevolvewithnewfeaturesandcapabilities.OurgoalsforSwiftar
