Normally on iOS you will have many ways to scan QR codes such as using third-party applications, using the QR scanning feature integrated QR Code Reader in the Control Center menu.
But with just a small setting, you just need to launch the iOS camera, towards the QR code, a notification appears and when touching it, you can quickly access the content hidden behind the code. Note that this feature is only supported on the rear camera of the device.

Enable QR code scanning for Camera
How to enable QR scanning with the camera
• Go to Settings> Camera.
• Next, turn on the Scan QR Codes option to enable the feature.
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