My phones screen color is inverted but settings doesn’t change anything, something is wrong with my phone itself and also a screen is stuck behind what I’m viewing so for example if I look at an app and leave it, it shows it in the background after

Hello Pilot_string_,

Thanks for using Apple Support Communities, it's great to have you here.

We understand that your iPhone is experiencing some unexpected behavior after your trip to the pool and we'd like to help get you pointed in the right direction.

To that end, we think that having your iPhone inspected in person is going to be your best option here. Based on the potential for liquid contact and being exposed to a very high heat and direct sunlight, it's possible that your device is experiencing a physical hardware issue. However, the only way to know for sure is to allow a technician to physically inspect the iPhone and make that determination.

To get started, you can head here and see if hardware service is available in your region: iPhone Repair & Service - Apple Support

We hope this information is helpful!

Have a great day.