Xamarin.Forms使用ViewModel导航到另一个页面

Question

我有几个ContentPages,我想通过单击页面中的元素从一个导航到另一个.我有我的ViewModel类:

 class JumpVM : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private INavigation _navigation;

        public ICommand NewPage
        {
            get
            {
                return new Command(async () =>
                {
                    await _navigation.PushAsync(new MySettingsPage());
                });
            }
        }

        public JumpVM() { }

        public JumpVM(INavigation navitation)
        {
            _navigation = navitation;
        }
    }

这是我的一个页面(为了空间,我只放了相关的代码):

BindingContext = new JumpVM(this.Navigation);

....

 Image fbInvite = new Image
            {
                Source = ImageSource.FromResource(Constants.ASSETLOCATION + ".facebookInviteIcon.png"),
                HorizontalOptions = LayoutOptions.Center
            };
            fbInvite.GestureRecognizers.Add(new TapGestureRecognizer(sender =>
                {
                    //navigation in the method below
                    FaceboonInviteFriends();
                    fbInvite.Opacity = 0.8;
                    fbInvite.FadeTo(1);
                }));

我想在单击图像时执行JumpVM类中的Command并导航到那里的页面.我怎样才能做到这一点？

Answer 1

这是在ViewModel概念中将一页导航到另一页的答案。

public ICommand NavigationList { get; set; }

NavigationList = new Command(GetListview);  

public void  GetListview()
{
   Xamarin.Forms.Application.Current.MainPage.Navigation.PushAsync(new ListViewPerson());
}

Answer 2

尝试在行后添加以下行FadeTo： ((JumpVM)BindingContext).NewPage.Execute(null)。