关于 UITextField 的键盘是可以自定义的，正好在一个代码用这个，就总结一下。

在 UITextField 中有一个 keyboardType 属性，它的类型是一个枚举值，下面就是枚举值和对应的键盘样式

UIKeyboardTypeDefault　　// Default type for the current input method.

UIKeyboardTypeASCIICapable　　// Displays a keyboard which can enter ASCII characters, non-ASCII keyboards remain active

UIKeyboardTypeNumbersAndPunctuation　　// Numbers and assorted punctuation.

UIKeyboardTypeURL　　// A type optimized for URL entry (shows . / .com prominently).

UIKeyboardTypeNumberPad　　// A number pad (0-9). Suitable for PIN entry.

UIKeyboardTypePhonePad　　// A phone pad (1-9, *, 0, #, with letters under the numbers).

 

UIKeyboardTypeNamePhonePad　　// A type optimized for entering a person's name or phone number.

UIKeyboardTypeEmailAddress　　// A type optimized for multiple email address entry (shows space @ . prominently).

UIKeyboardTypeDecimalPad　　// A number pad with a decimal point.

UIKeyboardTypeTwitter　　// A type optimized for twitter text entry (easy access to @ #)

UIKeyboardTypeWebSearch　　// A default keyboard type with URL-oriented addition (shows space . prominently).

UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, // Deprecated