Camera for OBS Studio is an add-on for OBS that allows you to use your iOS phone as a video recording device. You must use the app Camera for OBS Studio with the desktop version of OBS which has Mac, Windows, and Linux support. There is a one-time purchase cost of $15.99. We think it's worth it to get a high-quality app like Camera for OBS Studio vs. using a free app like Streamlabs OBS.
Once the Camera for OBS Studio is installed as an add-on, you can use USB to make your iPhone a source to use in OBS. While it can be done wireless, you'll need a good upload speed on your wireless network to get 1080p streaming. It should be easy to achieve if your computer is hardwired via Ethernet cable.
You will probably want to check out a website like www.monoprice.com to get 10 foot+ cables for this.
Finally, we're going to provide instructions for set up via the obs.camera site. There are multiple options on how to do this, so we think it's best if you read it right from the builders of the app:
Now, once you've got the add-on working, you can proceed like normal with streaming from OBS to Uscreen. Read the following help guide to know how to set it up.