[Swift]ASCII值的获取和转换：extension Character类和extension Int

Character转ASCII整数值：

//Character扩展方法  
extension Character  
{  
  //转ASCII整数值(定义小写为整数值)
   var ascii: Int {
        get {
            let s = String(self).unicodeScalars
            return Int(s[s.startIndex].value)
        }
    }
    
   //Character转ASCII整数值
    func toInt() -> Int  
    {  
        var num:Int = Int()
        for scalar in String(self).unicodeScalars  
        {  
            num = Int(scalar.value)  
        }  
        return num  
    }  
}

ASCII整数值转Character：

//Int扩展方法  
extension Int
{
    //属性：ASCII值(定义大写为字符值)
    var ASCII:Character 
    {
        get {return Character(UnicodeScalar(self)!)}
    }
}