有没有办法在没有自定义渲染器的情况下以 xamarin 表单实现 toast 消息答案

【问题标题】：Is there any way to implement toast message in xamarin forms without custom renderer有没有办法在没有自定义渲染器的情况下以 xamarin 表单实现 toast 消息
【发布时间】：2021-02-15 20:54:07
【问题描述】：

到目前为止，我一直在使用dependency service 在Xamarin.Forms 中显示toast messages。

现在我正在寻找一种方法，可以在不使用Custom renderer 和dependency service 的情况下仅在Xamarin Cross platform 中开发toast message。

谁能给我建议

【问题讨论】：

标签： xamarin xamarin.forms cross-platform

【解决方案1】：

您可以尝试 ACR 用户对话框块插件。

https://github.com/aritchie/userdialogs

我将它用于我的所有项目！

快速示例

Acr.UserDialogs.ToastConfig.DefaultPosition = ToastPosition.Top;

Acr.UserDialogs.UserDialogs.Instance.InfoToast("Toast at the top");

【讨论】：

没有插件我们能做什么
如果您不想使用第三方插件，请仅使用依赖服务。我推荐用户对话框，它是一个救生员，它还有一个非常漂亮的加载器！！
创建您自己的控制模板并使用 absolutelayout 放置文本并运行一个计时器功能，该功能可以关闭和打开可见性，之后在您的内容页面上使用控制模板，现在您可以控制您的客户烤面包机

【解决方案2】：

我觉得新的https://github.com/xamarin/XamarinCommunityToolkit有些东西

<?xml version="1.0" encoding="UTF-8"?>
<pages:BasePage xmlns="http://xamarin.com/schemas/2014/forms"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                xmlns:pages="clr-namespace:Xamarin.CommunityToolkit.Sample.Pages"
                x:Class="Xamarin.CommunityToolkit.Sample.Pages.Views.SnackBarPage">
    <StackLayout Spacing="10" Margin="20">
        <Button Clicked="DisplaySnackBarClicked" Text="Show SnackBar"></Button>
        <Button Clicked="DisplayToastClicked" Text="Show toast"></Button>
        <Button Clicked="DisplaySnackBarAdvancedClicked" Text="Show SnackBar"></Button>
        <Label x:Name="StatusText"></Label>
    </StackLayout>
</pages:BasePage>




using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Threading.Tasks;
using Xamarin.CommunityToolkit.Extensions;
using Xamarin.CommunityToolkit.UI.Views.Options;
using Xamarin.Forms;

namespace Xamarin.CommunityToolkit.Sample.Pages.Views
{
    public partial class SnackBarPage : BasePage
    {
        public SnackBarPage() => InitializeComponent();

        async void DisplaySnackBarClicked(object sender, EventArgs args)
        {
            var result = await this.DisplaySnackBarAsync(GenerateLongText(5), "Run action", () =>
            {
                Debug.WriteLine("SnackBar action button clicked");
                return Task.CompletedTask;
            });
            StatusText.Text = result ? "SnackBar is closed by user" : "SnackBar is closed by timeout";
        }

        async void DisplayToastClicked(object sender, EventArgs args)
        {
            var result = await this.DisplayToastAsync(GenerateLongText(5));
            StatusText.Text = result ? "SnackBar is closed by user" : "SnackBar is closed by timeout";
        }

        async void DisplaySnackBarAdvancedClicked(object sender, EventArgs args)
        {
            var messageOptions = new MessageOptions
            {
                Foreground = Color.DeepSkyBlue,
                FontSize = 40,
                FontFamily = "Sans-serif",
                Message = GenerateLongText(5)
            };

            var actionOptions = new List<SnackBarActionOptions>
            {
                new SnackBarActionOptions
                {
                    ForegroundColor = Color.Red,
                    BackgroundColor = Color.Green,
                    FontSize = 40,
                    FontFamily = "Sans-serif",
                    Text = "Action1",
                    Action = () =>
                    {
                        Debug.WriteLine("1");
                        return Task.CompletedTask;
                    }
                },
                new SnackBarActionOptions
                {
                    ForegroundColor = Color.Green,
                    BackgroundColor = Color.Red,
                    FontSize = 20,
                    FontFamily = "Sans-serif",
                    Text = "Action2",
                    Action = () =>
                    {
                        Debug.WriteLine("2");
                        return Task.CompletedTask;
                    }
                }
            };
            var options = new SnackBarOptions(messageOptions, 5000, Color.Coral, true, actionOptions);
            var result = await this.DisplaySnackBarAsync(options);
            StatusText.Text = result ? "SnackBar is closed by user" : "SnackBar is closed by timeout";
        }

        string GenerateLongText(int stringDuplicationTimes)
        {
            const string message = "It is a very long message to test multiple strings. A B C D E F G H I I J K LO P Q R S T U V W X Y Z";
            var result = new StringBuilder();
            for (var i = 0; i < stringDuplicationTimes; i++)
            {
                result.AppendLine(message);
            }

            return result.ToString();
        }
    }
}

【讨论】：