Int转换Float或Double:
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let intVar : Int = 3 let doubleVar : Double = Double(intVar) |
Int转换为String:
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let intVar : Int = 3 let strVar : String = String(intVar) |
String转换为Int:
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let strVar : String = "123" let intVar : Int? = strVar.toInt() |
Double转换为String:
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let doubleVar : Double = 3.14 let strVar : String = String(doubleVar) |
Double保留两位小数,需要对Double进行扩展:
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extension Double { func format(f: String) -> String { return NSString(format: "%\(f)f", self) } } let myDouble = 1.234567 println(myDouble.format(".2") |
String转换Double:
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let strVar : String = "3.14" var string = NSString(string: strVar) string.doubleValue |