Xamarin Forms 3.1 UWP DisplayActionSheet-参数不正确。放置目标需要在可视树中

很抱歉我之前的回答不正确

问题是 Page1 是 ModalPage ,但您仍然使用 NavigationStack 作为父原因 ActionSheet 在错误的地方渲染。

public static Page Instance
{
    get
    {
        Page ret = null;
        if (Application.Current.MainPage.Navigation.NavigationStack != null)
            ret = Application.Current.MainPage.Navigation.NavigationStack.LastOrDefault();

        if (ret == null)
            ret = Application.Current.MainPage;

        return ret;
    }
}

如果你用过 PushModalAsync 方法,页将堆叠在其中。 ModalStack

get
{
    Page ret = null;
    if (Application.Current.MainPage.Navigation.ModalStack != null)
        ret = Application.Current.MainPage.Navigation.ModalStack.LastOrDefault();

    if (ret == null)
        ret = Application.Current.MainPage;

    return ret;
}