1.UIKeyboardTypeAlphabet
2.UIKeyboardTypeASCIICapable
3.UIKeyboardTypeDecimalPad 
4.UIKeyboardTypeDefault
5.UIKeyboardTypeEmailAddress
6.UIKeyboardTypeNamePhonePad
7.UIKeyboardTypeNumberPad
8.UIKeyboardTypeNumbersAndPunctuation
9.UIKeyboardTypePhonePad
10.UIKeyboardTypeTwitter
11.UIKeyboardTypeURL