在 Xamarin 中状态更改时隐藏按钮

Question

我已经实现了一个按钮，它需要一个函数。该函数实际上向服务器发送一个请求以颁发证书。当用户收到凭据时，凭据状态为已提供，但当她/他单击此按钮时，它会向服务器发送请求，并且按钮状态更改为已接收 .

我只想在按钮状态为Offered时显示按钮。

CredentialPage.xml

<Button x:Name="Button_Round"
WidthRequest="40"
HeightRequest="40"
CornerRadius="20"
BorderWidth="2"
TextColor="White"
BorderColor="Teal"
BackgroundColor="Teal"
Text="Accept Offer"
Command="{Binding ProcessOffer}" />

CredentialViewModel.cs => CreateRequestAsync() 是一个，它将请求发送到服务器。当请求发送成功后，我想隐藏按钮。

    public ICommand ProcessOffer => new Command(async () =>
    {
        try
        {
            //await _poolConfigurator.ConfigurePoolsAsync();
            var agentContext = await _agentContextProvider.GetContextAsync();
            var credentialRecord = await _credentialService.GetAsync(agentContext, _credential.Id);
            var connectionId = credentialRecord.ConnectionId;
            var connectionRecord = await _connectionService.GetAsync(agentContext, connectionId);
            (var request, _) = await _credentialService.CreateRequestAsync(agentContext, _credential.Id);
            await _messageService.SendAsync(agentContext.Wallet, request, connectionRecord);
            await DialogService.AlertAsync("Request has been sent to the issuer.", "Success", "Ok");
        }
        catch (Exception e)
        {
            await DialogService.AlertAsync("Pool is not correctly configured. Please add proper genesis file.\n("+e.Message+")","Pool Error","Ok");
        }
    });

如果你能指导我，你会很友善:)

Answer 1

将IsVisible 属性绑定到VM 属性

<Button x:Name="Button_Round"  IsVisible="{Binding ButtonVisible}" ... />

然后在您的 VM 中（您的 VM 必须实现 INotifyPropertyChanged）

private bool _ButtonVisible = true;

public bool ButtonVisible
{
  get {
    return _ButtonVisible;
  }
  set {
     _ButtonVisible = value;
     PropertyChanged("ButtonVisible");
  }
 }

那么每当您收到来自服务器的响应时，您可以将ButtonVisible 设置为适当的值