iOS-键盘弹出的类型

iOS 提供了10种键盘类型，在开发中，我们可以根据不同的需求，选择不同的键盘样式，例如，当我们只需要输入手机号码时，可以选择纯数字类型的键盘（NumbersAndPunctuation），当我们需要输入网址时，可以选择URL样式的键盘（UIKeyboardTypeURL），其中，默认的键盘样式（UIKeyboardTypeDefault）就是（UIKeyboardTypeNamePhonePad）样式。

我们可以通过输入框的 keyboardType 来设置键盘样式

UITextField.keyboardType = UIKeyboardTypeNamePhonePad;

 1、  UIKeyboardTypeDefault,
        // Default type for the current input method.
 2、  UIKeyboardTypeASCIICapable,           
        // Displays a keyboard which can enter ASCII characters, non-ASCII keyboards remain active
 3、  UIKeyboardTypeNumbersAndPunctuation,  
        // Numbers and assorted punctuation.
 4、  UIKeyboardTypeURL,                    
        // A type optimized for URL entry (shows . / .com prominently).
 5、  UIKeyboardTypeNumberPad,              
        // A number pad (0-9). Suitable for PIN entry.
 6、  UIKeyboardTypePhonePad,               
        // A phone pad (1-9, *, 0, #, with letters under the numbers).
 7、  UIKeyboardTypeNamePhonePad,           
        // A type optimized for entering a person‘s name or phone number.
 8、  UIKeyboardTypeEmailAddress,           
        // A type optimized for multiple email address entry (shows space @ . prominently).
 9、  UIKeyboardTypeDecimalPad NS_ENUM_AVAILABLE_IOS(4_1),   
        // A number pad with a decimal point.
 10、 UIKeyboardTypeTwitter    NS_ENUM_AVAILABLE_IOS(5_0),   
        // A type optimized for twitter text entry (easy access to @ #)
 11、 UIKeyboardTypeWebSearch NS_ENUM_AVAILABLE_IOS(7_0),    
        // A default keyboard type with URL-oriented addition (shows space . prominently).

下面一图像展示区别
UIKeyboardTypeDefault

UIKeyboardTypeNumbersAndPunctuation

UIKeyboardTypeURL

UIKeyboardTypeNumberPad

UIKeyboardTypePhonePad

UIKeyboardTypeEmailAddress

UIKeyboardTypeDecimalPad

UIKeyboardTypeTwitter

UIKeyboardTypeWebSearch