Why does iOS link "static" to Unity?

Question

[DllImport("__Internal")]
private static extern void IOSFBInit(string appId, bool frictionlessRequests, string urlSuffix, string unityUserAgentSuffix);  

First, sorry for my English.
I already know that iOS use DllImport("__Internal") for "static link" to C# script(Unity).
But, other platforms(Android, Windows..) are using dynamic linking not static linking.
Why "only" iOS use static linking to link C# script?

Answer 1

That is a limit on iOS now. Because the library's signature and app's signature must be the same. But Apple had provided a function of dynamiclly load on macOS.

There is a instance in UnityWebRTCPlugin.

• for iOS use libwebrtc.a
• for macOS use libwebrtc.dylib

This is a brief description about statically load and dynamiclly load.