iOS 侧滑返回过程中导航栏的黑色问题解决办法

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
   //开启侧滑返回
self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
//对于导航栏的是否显示使用此方法设置
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}
//设置状态栏的颜色显示
-(UIStatusBarStyle)preferredStatusBarStyle{
     return UIStatusBarStyleLightContent;
}