The Subaru CrossTrek does have Apple CarPlay! This feature is now standard in most Subaru models, although the CrossTrek first got CarPlay just a few years ago in the 2018 model year.
To connect your phone to your Subaru’s CarPlay feature, you’ll need to enable your Wi-fi and Bluetooth if your iPhone. Then, connect to your vehicle’s Subaru Starlink Infotainment System via Bluetooth or USB. When you do this, you’ll be prompted by a pop-up to approve your vehicle for CarPlay use.