You have issues with WireGuard split tunneling in general or only on iOS ?

To make split tunneling work in WireGuard I changed AllowedIPs = 0.0.0.0/0 in the config file into: AllowedIPs = 92.13.14.15/32 10.192.122.0/24

where 10.192.122.0/24 is the subnet of my tunnel, and 92.13.14.15/32 is the ip address of my home computer

this works on iOS and macos for me