title: How to change label dynamically in Fragment?
body: <p>I want to change the "android:label" in <code>Fragment</code></p>
  
  <p>I tried to run the following code to change label, but It failed.</p>
  
  <pre><code>val graph = findNavController().graph
  graph.label = "测试"
  findNavController().graph = graph
  </code></pre>