* [Document] add english document of Checkbox
* [Document] add english document of Field
* [Document] add english document of NumberKeyboard
* [bugfix] NumberKeyboard should not dispaly title when title is empty
* [Document] add english document of PasswordInput
* [Document] add english document of Radio
* [document] add english document of Switch
* [bugfix] remove redundent styles in english document
* [Document] fix details
* fix Switch test cases
* [bugfix] Swipe shouid reinitialize when item changes
* [new feature] ImagePreview reconstruct
neverlandandGitHub
陈嘉涵
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