整理下方便以后查阅～
UIKeyboardTypeDefault
UIKeyboardTypeDefault //Default type for the current input method.
UIKeyboardTypeASCIICapable
UIKeyboardTypeASCIICapable, // Displays a keyboard which can enter ASCII characters
UIKeyboardTypeNumbersAndPunctuation
UIKeyboardTypeNumbersAndPunctuation, // Numbers and assorted punctuation.
UIKeyboardTypeURL
UIKeyboardTypeURL, // A type optimized for URL entry (shows . / .com prominently).
UIKeyboardTypeNumberPad
UIKeyboardTypeNumberPad, // A number pad with locale-appropriate digits (0-9, ۰-۹, ०-९, etc.). Suitable for PIN entry.
UIKeyboardTypePhonePad
UIKeyboardTypePhonePad, // A phone pad (1-9, *, 0, #, with letters under the numbers).
UIKeyboardTypeNamePhonePad
UIKeyboardTypeNamePhonePad, // A type optimized for entering a person's name or phone number.
UIKeyboardTypeEmailAddress
UIKeyboardTypeEmailAddress, // A type optimized for multiple email address entry (shows space @ . prominently).
UIKeyboardTypeDecimalPad
UIKeyboardTypeDecimalPad NS_ENUM_AVAILABLE_IOS(4_1), // A number pad with a decimal point.
UIKeyboardTypeTwitter
UIKeyboardTypeTwitter NS_ENUM_AVAILABLE_IOS(5_0), // A type optimized for twitter text entry (easy access to @ #)
UIKeyboardTypeWebSearch
UIKeyboardTypeWebSearch NS_ENUM_AVAILABLE_IOS(7_0), // A default keyboard type with URL-oriented addition (shows space . prominently).
UIKeyboardTypeASCIICapableNumberPad
UIKeyboardTypeASCIICapableNumberPad NS_ENUM_AVAILABLE_IOS(10_0), // A number pad (0-9) that will always be ASCII digits.
UIKeyboardTypeAlphabet
UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, // Deprecated 已废弃
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