LSApplicationQueriesSchemes kbkeyboardAppExtension NSMicrophoneUsageDescription 需要使用麦克风进行语音输入 NSExtension NSExtensionAttributes IsASCIICapable PrefersRightToLeft PrimaryLanguage en-US RequestsOpenAccess NSExtensionPointIdentifier com.apple.keyboard-service NSExtensionPrincipalClass KeyboardViewController