swift 字符串提取数字

func isPurnInt(_ str : String) -> Bool{
let scanner :Scanner = Scanner(string: str)
var val = 0
return scanner.scanInt(&val) && scanner.isAtEnd
}

//字符串提取数字

func getIntFromString(str : String) -> Int {
let scanner = Scanner(string: str)
scanner.scanUpToCharacters(from: CharacterSet.decimalDigits, into: nil)
var number = 0
scanner.scanInt(&number)
return number
}