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《The Swift Programming Language》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、WelcometoSwiftAboutSwiftSwiftisanewprogramminglanguageforiOSandOSXappsthatbuildsonthebestofCandObjective-C,withouttheconstraintsofCcompatibility.Swiftadoptssafeprogrammingpatternsandaddsmodernfeaturestomakeprogrammingeasier,moreflexible,andmorefun.Swift’scleanslate,backedbyth
2、ematureandmuch-lovedCocoaandCocoaTouchframeworks,isanopportunitytoreimaginehowsoftwaredevelopmentworks.Swifthasbeenyearsinthemaking.ApplelaidthefoundationforSwiftbyadvancingourexistingcompiler,debugger,andframeworkinfrastructure.WesimplifiedmemorymanagementwithAutomaticRefere
3、nceCounting(ARC).Ourframeworkstack,builtonthesolidbaseofFoundationandCocoa,hasbeenmodernizedandstandardizedthroughout.Objective-Citselfhasevolvedtosupportblocks,collectionliterals,andmodules,enablingframeworkadoptionofmodernlanguagetechnologieswithoutdisruption.Thankstothisgr
4、oundwork,wecannowintroduceanewlanguageforthefutureofApplesoftwaredevelopment.SwiftfeelsfamiliartoObjective-Cdevelopers.ItadoptsthereadabilityofObjective-C’snamedparametersandthepowerofObjective-C’sdynamicobjectmodel.ItprovidesseamlessaccesstoexistingCocoaframeworksandmix-and-
5、matchinteroperabilitywithObjective-Ccode.Buildingfromthiscommonground,Swiftintroducesmanynewfeaturesandunifiestheproceduralandobject-orientedportionsofthelanguage.Swiftisfriendlytonewprogrammers.Itisthefirstindustrial-qualitysystemsprogramminglanguagethatisasexpressiveandenjo
6、yableasascriptinglanguage.Itsupportsplaygrounds,aninnovativefeaturethatallowsprogrammerstoexperimentwithSwiftcodeandseetheresultsimmediately,withouttheoverheadofbuildingandrunninganapp.SwiftcombinesthebestinmodernlanguagethinkingwithwisdomfromthewiderAppleengineeringculture.T
7、hecompilerisoptimizedforperformance,andthelanguageisoptimizedfordevelopment,withoutcompromisingoneither.It’sdesignedtoscalefrom“hello,world”toanentireoperatingsystem.AllthismakesSwiftasoundfutureinvestmentfordevelopersandforApple.SwiftisafantasticwaytowriteiOSandOSXapps,andwi
8、llcontinuetoevolvewithnewfeaturesandcapabilities.OurgoalsforSwiftare
