iOS 键盘样式UIKeyboardType

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 NS_ENUM_AVAILABLE_IOS(4_1), // A number pad with a decimal point.

UIKeyboardTypeTwitter NS_ENUM_AVAILABLE_IOS(5_0), // A type optimized for
twitter text entry (easy access to @ #)

UIKeyboardTypeWebSearch NS_ENUM_AVAILABLE_IOS(7_0), // A default keyboard type
with URL-oriented addition (shows space . prominently).

UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable,// Deprecated