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1、WelcometoSwiftAboutSwiftSwiftisanewprogramminglanguageforiOSandOSXappsthatbuildsonthebestofCandObjective-C,withouttheconstraintsofCcompatibility.Swiftadoptssafeprogrammingpatternsandaddsmodernfeaturestomakeprogrammingeasier,moreflexible,andmorefun.Swift’scleanslate,backedbythem
2、atureandmuch-lovedCocoaandCocoaTouchframeworks,isanopportunitytoreimaginehowsoftwaredevelopmentworks.Swifthasbeenyearsinthemaking.ApplelaidthefoundationforSwiftbyadvancingourexistingcompiler,debugger,andframeworkinfrastructure.WesimplifiedmemorymanagementwithAutomaticReferenceC
3、ounting(ARC).Ourframeworkstack,builtonthesolidbaseofFoundationandCocoa,hasbeenmodernizedandstandardizedthroughout.Objective-Citselfhasevolvedtosupportblocks,collectionliterals,andmodules,enablingframeworkadoptionofmodernlanguagetechnologieswithoutdisruption.Thankstothisgroundwo
4、rk,wecannowintroduceanewlanguageforthefutureofApplesoftwaredevelopment.SwiftfeelsfamiliartoObjective-Cdevelopers.ItadoptsthereadabilityofObjective-C’snamedparametersandthepowerofObjective-C’sdynamicobjectmodel.ItprovidesseamlessaccesstoexistingCocoaframeworksandmix-and-matchint
5、eroperabilitywithObjective-Ccode.Buildingfromthiscommonground,Swiftintroducesmanynewfeaturesandunifiestheproceduralandobject-orientedportionsofthelanguage.Swiftisfriendlytonewprogrammers.Itisthefirstindustrial-qualitysystemsprogramminglanguagethatisasexpressiveandenjoyableasasc
6、riptinglanguage.Itsupportsplaygrounds,aninnovativefeaturethatallowsprogrammerstoexperimentwithSwiftcodeandseetheresultsimmediately,withouttheoverheadofbuildingandrunninganapp.SwiftcombinesthebestinmodernlanguagethinkingwithwisdomfromthewiderAppleengineeringculture.Thecompileris
7、optimizedforperformance,andthelanguageisoptimizedfordevelopment,withoutcompromisingoneither.It’sdesignedtoscalefrom“hello,world”toanentireoperatingsystem.AllthismakesSwiftasoundfutureinvestmentfordevelopersandforApple.SwiftisafantasticwaytowriteiOSandOSXapps,andwillcontinuetoev
8、olvewithnewfeaturesandcapabilities.OurgoalsforSwiftare
