Using iPhone QR Code to open lock

Hi everyone,
Im attempting to create a QR scanner with my iPhone app to open a door lock using an Arduino Uno. I am not sure how to connect the Arduino to the app on my phone. I saw a video online that did exactly what I wanted but with an Android and I was wondering if that was any way to do the same thing using iPhones. The link to the video I watched is here: App Inventor 2 + Arduino tutorial - simple QR code door lock - YouTube

Thanks in advance.

P.S. I am very new to Arduino and have only done a few personal projects for fun.

The main hardware difference is that the iPhone seems to require a Bluetooth 4.0 (BLE) interface on the Arduino.

Thank you. I will take this into consideration when doing some more research on the topic.