swift 型铸造-4-

Posted 2021-05-19

var integerValue = 42
var stringValue = String(describing: 42)

var doubleValue = integerValue as! Double
var floatValue = Int(stringValue) as? Float

var array: [String] = ["eggs", "bacon", "ham", "cheese"]
let arrayCount = Double(array.count as? String)

var numArray: [Int] = [1, 2, 3, 4, 5]
var anotherDouble = numArray[3] as? Double

var isSunny = true
var sunnyString = String(describing: isSunny)