UIKeyboardTypeDefault:
UIKeyboardTypeASCIICapable:
UIKeyboardTypeNumbersAndPunctuation:
UIKeyboardTypeURL:
UIKeyboardTypeNumberPad:
UIKeyboardTypePhonePad:
UIKeyboardTypeNamePhonePad:
UIKeyboardTypeEmailAddress:
UIKeyboardTypeDecimalPad:
UIKeyboardTypeTwitter:
UIKeyboardTypeWebSearch:
UIKeyboardTypeAlphabet:
原文:http://www.cnblogs.com/sunfuyou/p/6727006.html