相当于Xamarin形式的吐司 [英] Toast equivalent for Xamarin Forms

问题描述

是否可以使用Xamarin Forms(不是Android或iOS专用)弹出窗口，就像Android与Toast一样，不需要用户交互，并且会在(短)时间后消失?

Is there any way using Xamarin Forms (not Android or iOS specific) to have a pop-up, like Android does with Toast, that needs no user interaction and goes away after a (short) period of time?

从搜索中发现的所有警报都是需要用户单击才能消失的警报.

From searching around all I'm seeing are alerts that need user clicks to go away.

推荐答案

有一个简单的解决方案.通过使用 DependencyService ，您可以轻松获取Toast -类似于Android和iOS中的方法.

There is a simple solution for this. By using the DependencyService you can easily get the Toast-Like approach in both Android and iOS.

在常用程序包中创建一个界面.

public interface IMessage
{
    void LongAlert(string message);
    void ShortAlert(string message);
}

Android部分

[assembly: Xamarin.Forms.Dependency(typeof(MessageAndroid))]
namespace Your.Namespace
{
    public class MessageAndroid : IMessage
    {
        public void LongAlert(string message)
        {
            Toast.MakeText(Application.Context, message, ToastLength.Long).Show();
        }

        public void ShortAlert(string message)
        {
            Toast.MakeText(Application.Context, message, ToastLength.Short).Show();
        }
    }
}

iOS部分

在iO中，没有像Toast这样的本机解决方案，因此我们需要实现自己的方法.

In iOs there is no native solution like Toast, so we need to implement our own approach.

[assembly: Xamarin.Forms.Dependency(typeof(MessageIOS))]
namespace Bahwan.iOS
{
    public class MessageIOS : IMessage
    {
        const double LONG_DELAY = 3.5;
        const double SHORT_DELAY = 2.0;

        NSTimer alertDelay;
        UIAlertController alert;

        public void LongAlert(string message)
        {
            ShowAlert(message, LONG_DELAY);
        }
        public void ShortAlert(string message)
        {
            ShowAlert(message, SHORT_DELAY);
        }

        void ShowAlert(string message, double seconds)
        {
            alertDelay = NSTimer.CreateScheduledTimer(seconds, (obj) =>
            {
                dismissMessage();
            });
            alert = UIAlertController.Create(null, message, UIAlertControllerStyle.Alert);
            UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(alert, true, null);
        }

        void dismissMessage()
        {
            if (alert != null)
            {
                alert.DismissViewController(true, null);
            }
            if (alertDelay != null)
            {
                alertDelay.Dispose();
            }
        }
    }
}

请注意，在每个平台中，我们都必须向DependencyService注册我们的类.

Please note that in each platform, we have to register our classes with DependencyService.

现在您可以在我们项目的任何地方访问Toast服务.

Now you can access out Toast service in anywhere in our project.

DependencyService.Get<IMessage>().ShortAlert(string message); 
DependencyService.Get<IMessage>().LongAlert(string message);

这篇关于相当于Xamarin形式的吐司的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！