Swift データ型 String、Int、Float、Double 変換

文字列から数値へ

var text: String = "111"
var number: Int? = Int(text)

let text: String = "111"
var n: Int = (text as NSString).integerValue

数値から文字列へ

let number: Float = 123.5
var string: String = "\(number)"

var number: Float = 123.5
var string = String(number)

 数値間の変換

var doubleNumber = 1.8
var intNumber = 0
intNumber = Int(doubleNumber)