／／鍵盤的類型
text.keyboardType =UIKeyboardTypeNumberPad;
typedef enum {
UIKeyboardTypeDefault,默認鍵盤，支持所有字符
UIKeyboardTypeASCIICapable, 支持ASCII的默認鍵盤
UIKeyboardTypeNumbersAndPunctuation, 標準電話鍵盤，支持＋＊＃字符
UIKeyboardTypeURL,URL鍵盤，支持.com按鈕只支持URL字符
UIKeyboardTypeNumberPad,數字鍵盤
UIKeyboardTypePhonePad, 電話鍵盤
UIKeyboardTypeNamePhonePad, 電話鍵盤，也支持輸入人名
UIKeyboardTypeEmailAddress, 用于輸入電子郵件地址的鍵盤
UIKeyboardTypeDecimalPad,數字鍵盤有數字和小數點
UIKeyboardTypeTwitter,優化的鍵盤，方便輸入@、#字符
UIKeyboardTypeAlphabet =UIKeyboardTypeASCIICapable,
} UIKeyboardType;
／／return鍵類型
text.returnKeyType =UIReturnKeyDone;
typedef enum {
UIReturnKeyDefault,默認灰色按鈕，標有Return
UIReturnKeyGo,標有Go的藍色按鈕
UIReturnKeyGoogle,標有Google的藍色按鈕，用語搜索
UIReturnKeyJoin,標有Join的藍色按鈕
UIReturnKeyNext,標有Next的藍色按鈕
UIReturnKeyRoute,標有Route的藍色按鈕
UIReturnKeySearch,標有Search的藍色按鈕
UIReturnKeySend,標有Send的藍色按鈕
UIReturnKeyYahoo,標有Yahoo的藍色按鈕
UIReturnKeyYahoo,標有Yahoo的藍色按鈕
UIReturnKeyEmergencyCall,緊急呼叫按鈕
} UIReturnKeyType;
