SFSpeechRecognizer 是否需要互联网连接？
Does SFSpeechRecognizer require internet connection?
SFSpeechRecognizer 是否像 Siri 一样在 Apple 服务器上完成处理，还是在 iPhone 本地完成？
此 link 处的语音识别 API 说明
" In the case of speech recognition, permission is required because
data is transmitted and temporarily stored on Apple’s servers to
increase the accuracy of speech recognition."
所以这似乎表明处理是在 Apple 服务器上进行的。
根据https://developer.apple.com/videos/play/wwdc2019/256/ (mirror)，SFSpeechRecognizer做的语音识别可以on-device（即不连接服务器）进行语音识别：
但是，SFSpeechRecognizer's documentation (mirror) 说：
On-device speech recognition is available for some languages, but the framework also relies on Apple’s servers for speech recognition. Always assume that performing speech recognition requires a network connection.
上面的文档和 WWDC 2019 幻灯片似乎相互矛盾。
SFSpeechRecognizer 是否像 Siri 一样在 Apple 服务器上完成处理，还是在 iPhone 本地完成？
此 link 处的语音识别 API 说明
" In the case of speech recognition, permission is required because data is transmitted and temporarily stored on Apple’s servers to increase the accuracy of speech recognition."
所以这似乎表明处理是在 Apple 服务器上进行的。
根据https://developer.apple.com/videos/play/wwdc2019/256/ (mirror)，SFSpeechRecognizer做的语音识别可以on-device（即不连接服务器）进行语音识别：
但是，SFSpeechRecognizer's documentation (mirror) 说：
On-device speech recognition is available for some languages, but the framework also relies on Apple’s servers for speech recognition. Always assume that performing speech recognition requires a network connection.
上面的文档和 WWDC 2019 幻灯片似乎相互矛盾。