UIKeyboardType是一个枚举；如下
typedef enum {
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).
UIKeyboardTypeAlphabet = UIKeyboardTypeASCIICapable, // Deprecated
} UIKeyboardType;
下面是各个类型的样式
- UIKeyboardTypeAlphabet（Alphabet字母），UIKeyboardTypeASCIICapable，UIKeyboardTypeDefault: （这三个默认都显示字母表--下面第一幅图，另外可以切换倒--下面第二幅图）
- UIKeyboardTypeDecimalPad： (Decimal十进制)
- UIKeyboardTypeEmailAddress：
- UIKeyboardTypeNamePhonePad：（这个类型默认显示第一幅图片，如果点击123按钮则会显示第二副键盘）
- UIKeyboardTypeNumberPad：（下图显示）
- UIKeyboardTypeNumbersAndPunctuation：（默认显示下面第一幅图，切换显示第二幅）
- UIKeyboardTypeTwitter：（默认显示下面第一幅图，切换显示第二幅）
