[Solved] I need help with a Mixin Class to inject into a Method

[SparkleArts]

EDIT: I found the Solution how to fix it by myself.

I'm trying to make a Event that is fired if a Player is swimming.

Here is the Event Class:

public class PlayerSwimEvent extends PlayerEvent {

    public PlayerSwimEvent(Player player) {
        super(player);
    }
}

Here is the Hooks (similar to ForgeHooks Class) that has Methods for the Events:

public class EventHooks {
    public static void onPlayerSwim(Player player) {
        MinecraftForge.EVENT_BUS.post(new PlayerSwimEvent(player));
    }
}

And here is the Mixin Class:

@Mixin(value = Player.class)
public class MixinPlayerSwimEvent {
    @Inject(method = "isSwimming", at = @At("HEAD"))
    public boolean isSwimming(CallbackInfoReturnable<Boolean> cir) {
        Player player = null;
        if (!player.getAbilities().flying && !player.isSpectator()) {
            EventHooks.onPlayerSwim(player);
        }
        return cir.getReturnValue();
    }
}

My Issue is now that I don't get it to work because of the missing Parameter Player. Can someone help with this?

Edited December 4, 2023 by Jonas Handtke
Found the Solution by myself