As of iOS 11, Apple introduced a QR code scanner for the iPhone, which was integrated directly into the camera app, so that no third-party scanner is needed anymore. However, not everyone knew it existed, so many users still use third-party QR code scanners. In iOS 12, Apple has addressed this issue, improving its visibility and generally improving the scanning of QR codes.
You've just opened the Camera app – either from the Home screen, the lock screen or Control Center, Notification Center, and so on – and aim your lens at just the QR code you want to scan in Photo mode. This way still works the same way in iOS 12, but there is now another way to get to the QR code scanner.
The extra method is built into the Control Center so you can open it from anywhere on your iPhone (unless you've disabled the Control Center for some reason.) Yes, you could just tap the camera icon there, but now there is a dedicated "Scan QR Code" button for disconnection ̵
Step 1: Add the QR Button to the Control Center
The "Scan QR Code" button is not included in the Control Center on your iPhone by default, so you'll need to add it first by going to the Settings app, tapping Control Center, and selecting Controls on the following page
Scroll down until See More Controls "Scan QR Code" and then tap the green plus button to the right of it. After it has been added, you can change it from the last one in the Include to another place by dragging and dropping the three lines next to it. When finished, exit the Settings app and proceed to the next step.
Point your camera at n there on all QR codes that you want to scan. If you've ever scanned a QR code with Apple's tools before iOS 12, you'll notice right away that there's now a frame around the QR code that makes it easier to align and scan the image and reduce the number of failed read attempts.
Once it detects and reads a code, a confirmation prompt appears at the top. You can drag it down to see your options, or just tap it to open the content through Safari or its third-party app. For example, if you have scanned a QR code for a cryptocurrency wallet, Coinbase may open.
As mentioned above, tapping the button "Scan QR Code "exactly the same function as the camera button, which is already available in the Control Center. Both can take photos and videos as usual.
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