隐藏键盘快捷键

项目中有需要隐藏键盘快捷键的需求 这里记录一下

func hideAssistantBar() {
    if #available(iOS 9.0, *) {
        let assistant = self.inputAssistantItem
        assistant.leadingBarButtonGroups = []
        assistant.trailingBarButtonGroups = []
    }
}