Swift3 Scanner用法之判断是否数字、提取字符串里的数字

1.判断是否数字

    // - Parameter string: <#string description#>

/// - Returns: <#return value description#>

class func isPurnInt(string: String) -> Bool {

        let scan: Scanner = Scanner(string:string)

      varval:Int =0returnscan.scanInt(&val) && scan.isAtEnd

    }

2、提取字符串里的数字

从字符串中提取数字

class func getIntFromString(str:String) -> String {

        let scanner = Scanner(string: str)

        scanner.scanUpToCharacters(from: CharacterSet.decimalDigits, into: nil)

        varnumber :Int =0       

        scanner.scanInt(&number)

        print(number)

        return String(number)

    }