转换

Int -> String

let myInt: Int = 10
var myString = String(myInt)
let myInt: Int = 10
var myString = "\(myInt)"

Int -> String

let myString: String = "10"
let myInt: Int = Int(myString)

Int -> Float

let myInt = 556
let myFloat = Float(myInt)

Date -> String

Date to Timestamp

let timeInterval:TimeInterval = Date().timeIntervalSince1970
let timeStamp = Int(timeInterval)
print("Start时间戳：\(timeStamp)")