iOS 键盘样式

UIKeyboardTypeDefault

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UIKeyboardTypeASCIICapable

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UIKeyboardTypeNumbersAndPunctuation

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UIKeyboardTypeURL

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UIKeyboardTypeNumberPad

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UIKeyboardTypePhonePad

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UIKeyboardTypeNamePhonePad

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UIKeyboardTypeEmailAddress

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UIKeyboardTypeDecimalPad

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UIKeyboardTypeTwitter

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UIKeyboardTypeWebSearch

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UIKeyboardTypeASCIICapableNumberPad

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UIKeyboardTypeASCIICapable