导航栏背景色 iOS15列表滑动导航栏背景色问题

iOS13以上通过传统的barTintColor会异常，需要区分版本设置

    if (@available(iOS 13.0, *)) {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];

        appearance.backgroundImage= [UIImage imageNamed:@"hengtu1"];//图片
        appearance.backgroundColor= [UIColor blueColor];//背景色
        appearance.shadowColor = UIColor.clearColor; //阴影
        appearance.titleTextAttributes = @{NSForegroundColorAttributeName : [UIColor whiteColor]};//导航栏标题颜色

        self.navigationController.navigationBar.standardAppearance = appearance;
        self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
    } else {
        self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
    }