iOS 側滑返回過程中導航欄的黑色問題解決辦法

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
   //開啟側滑返回
self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;
//對於導航欄的是否顯示使用此方法設置
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}
//設置狀態欄的顏色顯示
-(UIStatusBarStyle)preferredStatusBarStyle{
     return UIStatusBarStyleLightContent;
}