destroySharedInstance method Null safety
销毁 TRTCCloud 单例。
Implementation
static Future<void> destroySharedInstance() async {
  await _channel.invokeMethod('destroySharedInstance');
  _trtcCloud = null;
}销毁 TRTCCloud 单例。
static Future<void> destroySharedInstance() async {
  await _channel.invokeMethod('destroySharedInstance');
  _trtcCloud = null;
}