Swift 5.1官方中文版.pdf

发布时间：2022-05-31 发布人：admin 分类：说明书资料大小：32.59M 资料格式：pdf 举报版权申诉

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Swift iOS, macOS, watchOS tvOS C Objective-C Swift Swift C Objective-C Int Double Float Bool String Swift Array Set Dictionary C Swift Swift C Swift Swift Objective-C Tuple Swift Optional “ x ” “” Objective-C nil Objective-C nil Swift Swift Swift String Int String String maximumNumberOfLoginAttempts welcomeMessage

10 "Hello" let var 1 2 let maximumNumberOfLoginAttempts = 10 var currentLoginAttempt = 0 “ maximumNumberOfLoginAttempts 10 currentLoginAttempt 0 ” var x = 0.0, y = 0.0, z = 0.0 let type annotation welcomeMessage String

var welcomeMessage: String “...” “ String welcomeMessage ” “ String ”“ String ” welcomeMessage welcomeMessage = "Hello" var red, green, blue: Double Swift welcomeMessage welcomeMessage Unicode 1 2 3 let π = 3.14159 let = "" let = "dogcow" Unicode

Swift ` friendlyWelcome "Hello!" "Bonjour!" : 1 2 3 var friendlyWelcome = "Hello!" friendlyWelcome = "Bonjour!" // friendlyWelcome "Bonjour!" 1 2 3 let languageName = "Swift" languageName = "Swift++" // - languageName print(_:separator:terminator:) : 1 2 print(friendlyWelcome) // “Bonjour!” print(_:separator:terminator:) Xcode print(_:separator:terminator:) “console” separator terminator

terminator -- print(someValue, terminator:"") Swift string interpolation Swift 1 2 print("The current value of friendlyWelcome is \(friendlyWelcome)") // “The current value of friendlyWelcome is Bonjour!” Swift Swift C // : // /* */ : 1 2 /* */ C Swift

1 2 3 /* /* */ */ Swift ; 1 2 let cat = " // “ ” "; print(cat) 42 -23 Swift 8163264 C 8 UInt8 32 Int32 Swift min max 1 2 let minValue = UInt8.min // minValue 0 UInt8 let maxValue = UInt8.max // maxValue 255 UInt8

min max UInt8, UInt8 Int Swift Int 32 Int Int32 64 Int Int64 Int 32 Int -2,147,483,648 ~ 2,147,483,647 UInt Swift UInt 32 UInt UInt32 64 UInt UInt64 UInt Int Int 3.14159 0.1 -273.15 Int Swift

Double 64 Float 32 Double 15 Float 6 Double Swift type safe String Int Swift type checks Swift type inference C Objective-C Swift literal value literal 42 3.14159 42 Swift Int 1 2 let meaningOfLife = 42 // meaningOfLife Int

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