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