ios 侧边手势滑动返回 禁用/开启 功能

// 禁用  返回手势  

    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  

        self.navigationController.interactivePopGestureRecognizer.enabled = NO;  

   }  

}  

  // 开启  

  if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {  

      self.navigationController.interactivePopGestureRecognizer.enabled = YES;  

  }