问题
Client wants a button on the mobile web app that launches a QR code scan (with camera on iPad) then returns to the mobile web app with the QR code info. Wondering how best to achieve this and/or if it's even possible. Thanks!
回答1:
Yes, see the zxing: URL format here.
回答2:
Not really possible, sorry.
The closest you can get is some apps have a URL scheme (redlaser://, for example) that you could provide a link to. There's no way of detecting that they've got the app installed, though.
回答3:
The best thing would be to use a bluetooth barcode scanner. Something like Socket scan , CX2864-1336 would work for well for this. I've seen it used with an ipad to manage inventory.
回答4:
Seems like that would require two separate native applications. Both using URL schemes to jump to the other and pass information. If you have a web app and check for a QR code scanner's URL scheme it's totally possible for your web app to launch a QR code scan but passing data back would require a native app. Oh, and I'm not sure if there are any QR code apps with a scheme.
来源：https://stackoverflow.com/questions/11195178/is-it-possible-to-launch-a-qr-code-scan-from-a-mobile-web-app-running-on-ipad