Character轉ASCII整數值：

 1 //Character擴充套件方法  
 2 extension Character  
 3 {  
 4   //屬性：ASCII整數值(定義小寫為整數值)
 5    var ascii: Int {
 6         get {
 7             let s = String(self).unicodeScalars
 8             return Int(s[s.startIndex].value)
 9         }
10     }
11     
12    //Character轉ASCII整數值
 

13     func toInt() -> Int  
14     {  
15         var num:Int = Int()
16         for scalar in String(self).unicodeScalars  
17         {  
18             num = Int(scalar.value)  
19         }  
20         return num  
21     }  
22 }

ASCII整數值轉Character：

1 //Int擴充套件方法  
2 extension Int
 
3 {
4   //屬性：ASCII值(定義大寫為字元值)
5    var ASCII:Character  {
6         get {
7             return  Character(UnicodeScalar(self)!)
8         }
9 }