The-Swift-Programming-Language.pdf

The-Swift-Programming-Language.pdf

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时间:2019-07-21

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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

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