IKEV2 is fast and secure and mobile-friendly VPN protocol.
Since it has no interface, it is a little complex to create.
Here are the steps:
Add CA
Sign It
Add Server Certificate
Sign It with CA
Add Client Certificate
Sign It with CA
Export CA for Clients (for iOS)
Export Client Certificate (for iOS)
Add ip pool for IKEV2 (better calculate online)
Add mode config for Ikev2
Add Proposal for Ikev2
Create Group for Ikev2
Create Policy for Ikev2
Add profile for Ikev2
Add Peers for Ikev2
Add Identity for Ikev2
Now, Ikev2 server in RouterOS is finished.
Download the exported two files, CA and CA client.
And copy to iPhone iCloud .
Install the two certificates.
Add VPN Ikev2 (it is default vpn protocol in iOS)
Done!