苹果官方swift文档
AboutSwift
SwiftisanewprogramminglanguageforiOSandOSXappsthatbuildsonthebestofC
andObjective-C,withouttheconstraintsofCcompatibility.Swiftadoptssafe
programmingpatternsandaddsmodernfeaturestomakeprogrammingeasier,more
flexible,andmorefun.Swift’scleanslate
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