如何在Xamarin.iOS中实现大字体可访问性？

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
    // 设置字体大小变化通知
    NSNotificationCenter.DefaultCenter.AddObserver(UIApplication.DidChangeContentSizeCategoryNotification, DidChangeTextSize);

    return base.FinishedLaunching(app, options);
}

// 处理字体大小变化
private void DidChangeTextSize(NSNotification notification)
{
    // 获取当前字体大小
    var contentSizeCategory = UIApplication.SharedApplication.PreferredContentSizeCategory;

    // 根据字体大小设置应用程序的字体
    switch (contentSizeCategory)
    {
        case UIContentSizeCategory.ExtraSmall:
            // 设置字体大小为ExtraSmall
            break;
        case UIContentSizeCategory.Small:
            // 设置字体大小为Small
            break;
        case UIContentSizeCategory.Medium:
            // 设置字体大小为Medium
            break;
        case UIContentSizeCategory.Large:
            // 设置字体大小为Large
            break;
        case UIContentSizeCategory.ExtraLarge:
            // 设置字体大小为ExtraLarge
            break;
        case UIContentSizeCategory.ExtraExtraLarge:
            // 设置字体大小为ExtraExtraLarge
            break;
        case UIContentSizeCategory.ExtraExtraExtraLarge:
            // 设置字体大小为ExtraExtraExtraLarge
            break;
        default:
            // 设置默认字体大小
            break;
    }
}

Label label = new Label
{
    Text = "Hello, Xamarin.iOS!",
    FontSize = Device.GetNamedSize(NamedSize.Medium, typeof(Label))
};