Improved QR code reader
The QR code reader was originally introduced in iOS 11, but iOS 12 has brought improvements to the feature. Instead of pointing your camera at the code, iOS 12 will now highlight it for you to indicate that it has been detected. For easier access to the feature, you can also now add it to your Control Center. So when you want to scan a QR code, all you need to do is swipe into the Control Center and tap the tile to launch the feature.
Easy-to-use App Switcher
With iOS 12, you no longer have to long-press a card in the app switcher and then tap the minus button. Instead, all you need to do is swipe up once and then swipe up again on the app you want to specifically close out of.