HTML

transparent navbar

<!-- Navbar -->
<nav class="navbar navbar-expand-lg navbar-dark shadow-5-strong">
  <!-- Container wrapper -->
  <div class="container-fluid">
    <!-- Navbar brand -->
    <a class="navbar-brand" href="#">Brand</a>

    <!-- Toggle button -->
    <button
      class="navbar-toggler"
      type="button"
      data-mdb-toggle="collapse"
      data-mdb-target="#navbarSupportedContent"
      aria-controls="navbarSupportedContent"
      aria-expanded="false"
      aria-label="Toggle navigation"
    >
      <i class="fas fa-bars"></i>
    </button>

    <!-- Collapsible wrapper -->
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <!-- Left links -->
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        <li class="nav-item">
          <a class="nav-link active" aria-current="page" href="#">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
        <!-- Navbar dropdown -->
        <li class="nav-item dropdown">
          <a
            class="nav-link dropdown-toggle"
            href="#"
            id="navbarDropdown"
            role="button"
            data-mdb-toggle="dropdown"
            aria-expanded="false"
          >
            Dropdown
          </a>
          <!-- Dropdown menu -->
          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
            <li>
              <a class="dropdown-item" href="#">Action</a>
            </li>
            <li>
              <a class="dropdown-item" href="#">Another action</a>
            </li>
            <li><hr class="dropdown-divider" /></li>
            <li>
              <a class="dropdown-item" href="#">Something else here</a>
            </li>
          </ul>
        </li>
        <li class="nav-item">
          <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true"
            >Disabled</a
          >
        </li>
      </ul>
      <!-- Left links -->
    </div>
    <!-- Collapsible wrapper -->
  </div>
  <!-- Container wrapper -->
</nav>
<!-- Navbar -->

transparent navigation bar

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default) //UIImage.init(named: "transparent.png")
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.isTranslucent = true
self.navigationController?.view.backgroundColor = .clear