Question: how to connect my iphone to a roku?
Answer: Download the Mirror for Roku App. Head over to the Apple App Store and download this app for Roku screen mirroring by iStreamer. ... 
Connect the App to Your TV. Connecting to your TV is simple. ... 
Tap on the Screen Mirroring Button. Tap the screen mirroring button in the app. ... 
Tap Start Broadcast. ... 
Start mirroring iPhone to Roku.