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After testing countless QR-reader apps, I settled upon i-nigma.

Hands-down, the most mature option for iOS.

Is there anything wrong with using the Google Search app? I haven't used QR codes very much, but it's seemed fine for when I have.

I think the reason Android works so well is the intent system is well thought out and just works. That just doesn't exist on iOS

That said, for opening links, Google's devised [1] for Chrome-ish on iOS to abstract everything, but I believe (as an Android user and developer myself) that all it takes is a

[[UIApplication sharedApplication] openURL:targetURL];

where targetURL is an NSUrl.

Chrome on iOS even allows you to specify a callback URL to return to.

[1] https://developers.google.com/chrome/mobile/docs/ios-links

Qyu takes a screenshot and display's this and in addition gives you the option to if it is a website open it in a browser.