public App()
{
// The root page of your application
MainPage = new ChatPage {
BindingContext = new ChatViewModel()
};
}
async void OnButtonClicked(object sender, EventArgs args)
{
// await label.RelRotateTo(360, 1000);
// await entry.RelRotateTo(360, 1000);
var target_page = new ChatPage(entry.Text);
await Navigation.PushModalAsync(target_page);
}