Sony has released a software update number 6.50 for the PlayStation 4, which will allow you to remotely access the system from iOS.
With the app, PS4 Remote Play, you can connect tablets and phones to Apple (requires iOS 12.1 or higher) to the system. This feature is already several years available on PC and Android.
The number of features is voice chat via microphone or enter text through the keyboard of the mobile device. The controls on the screen superimposed on an image, like in mobile games. To manage, of course, would be better with a third-party controller.