How to screen mirror your iOS 13 iPhone to your computer:
Download and install Reflector on your computer. It’s available for both macOS and Windows.
Connect your computer and iPhone to the same wifi network.
Open Reflector on your computer.
On your iPhone, swipe down from the top right corner of the screen to open Control Center. Tap "Screen Mirroring."
Scroll through the list of receivers and select where you want to mirror your screen. If you’re using Reflector, this will be the name of your computer.
That’s it! Now you’re wirelessly screen mirroring your iPhone with iOS 13.
If you want to screen mirror to another display like an Apple TV, the steps to connect will remain the same. All you have to do is choose the name of your Apple TV or other wireless receiver from the screen mirroring list.
With Reflector, you can take screenshots and record your devices. Just click the camera icon or the red button above your connected device to snap a photo or record video of its screen.
If you want to screen mirror to a projector or TV, simply connect your Reflector-enabled computer to the projector or TV with an HDMI cord. You’ll be wirelessly mirroring your device to the big screen in seconds.