unity add behavior to trigger code example

Example: unity check if a animator parameter trigger is activated

bool isPlaying(Animator anim, string stateName)
{
    if (anim.GetCurrentAnimatorStateInfo(animLayer).IsName(stateName) &&
            anim.GetCurrentAnimatorStateInfo(animLayer).normalizedTime < 1.0f)
        return true;
    else
        return false;
}