问题
We are building a mobile barcode-scanner using QuaggaJS that reads barcodes directly from the device's camera stream. Works fine on desktop/Android, but doesn't work at all on iOS.
From initial research, I've found that iOS simply does not support WebRTC/getUserMedia through Safari or iOS Chrome (related links below), which is what QuaggaJS uses to read the camera stream.
I've also seen this question about capturing a still image on iOS, but the answer provided is only for capturing a still image, not for reading the stream real-time.
My question - is there any other way to grab the stream from an iOS camera? Perhaps an alternate library other than QuaggaJS that does not use getUserMedia? I am not well-versed in Javascript, so I am not sure if there even is a possible way to access the camera stream other than getUserMedia.
A "no" is an acceptable answer here; I'm simply looking for someone more experienced to provide guidance.
Appendix/related links:
navigator.getUserMedia alternative API for iOS safari mobile browser?
https://www.quora.com/Why-is-navigator-getUserMedia-not-supported-in-Safari
https://bloggeek.me/webrtc-apple-or-microsoft/
HTML5: getUserMedia iOS issue?
回答1:
2017 update: Apple just announced that getUserMedia will finally be supported in iOS11.
Aug 2019 update: ONLY works in Safari, not in a WebView of any kind. Thanks @Klathmon for the comment.
回答2:
The quaggaJS page has a feature compatibility matrix which answers your question:
getusermedia is not supported on iOS safari.
As per the quaggaJS documentation (https://github.com/serratus/quaggaJS#browser-support)
Quagga makes use of many modern Web-APIs which are not implemented by all browsers yet. There are two modes in which Quagga operates:
analyzing static images and
using a camera to decode the images from a live-stream. The latter requires the presence of the MediaDevices API. You can track the compatibility of the used Web-APIs for each mode:
- Static Images
- Live Stream
I would suggest that you use static image mode on iOS as live stream mode is not supported.
来源：https://stackoverflow.com/questions/41619598/alternative-to-getusermedia-for-reading-live-camera-stream-on-ios