title: React Native - No command found with name 'focus'
body: <p>I run the react-native app in my Xcode, it can be build succeeded, but when I click the Textinput of the login page , it throwed a error :</p>
  <pre><code>No command found with name &quot;focus&quot;
  
  -[RCTUIManager dispatchViewManagerCommand:commandID:commandArgs:]
      RCTUIManager.m:1115
  __invoking___
  -[NSInvocation invoke]
  -[NSInvocation invokeWithTarget:]
  -[RCTModuleMethod invokeWithBridge:module:arguments:]
  facebook::react::invokeInner(RCTBridge*, RCTModuleData*, unsigned int, folly::dynamic const&amp;)
  facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&amp;&amp;, int)::$_0::operator()() const
  invocation function for block in facebook::react::RCTNativeModule::invoke(unsigned int, folly::dynamic&amp;&amp;, int)
  _dispatch_call_block_and_release
  _dispatch_client_callout
  _dispatch_lane_serial_drain
  _dispatch_lane_invoke
  _dispatch_workloop_worker_thread
  _pthread_wqthread
  start_wqthread
  </code></pre>
  <p>I search all of the questions ,but none can solve this problem.what's the reason of this error?</p>