Xamarin Forms NavigationBar有左边距

public class CustomNavigationPage : NavigationPage
{
    public CustomNavigationPage(Page root) : base(root)
    {
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();

        // 设置导航栏左边距
        BarMarginConfig.SetBarMargin(this);
    }
}

public static class BarMarginConfig
{
    public static void SetBarMargin(NavigationPage navigationPage)
    {
        // 获取导航栏的内部控件
        var navigationBar = navigationPage.GetInternalField<NavigationBar>("_navigationBar");

        // 设置左边距
        navigationBar.Padding = new Thickness(10, 0, 0, 0);
    }

    private static T GetInternalField<T>(this object obj, string fieldName)
    {
        var field = obj.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance);
        return (T)field.GetValue(obj);
    }
}

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        MainPage = new CustomNavigationPage(new MainPage());
    }
}