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Xamarin.Forms 應用程序在 IOS 上顯示藍屏，然后應用程序關閉

[英]Xamarin.Forms app shows blue screen on IOS then the app closes

 原文  2020-08-25 19:53:43  5   1    ios/ xamarin/ xamarin.forms/ xamarin.ios

問題描述

因此，當我在 android 模擬器上測試我的應用程序時，我沒有問題，但是當我在 iOS 上測試我的應用程序時，我得到了 Xamarin 的起始藍屏，然后應用程序關閉，我被帶到模擬器上的所有應用程序頁面（但它就像它仍在運行一樣，因為您仍然會在 Visual Studio 上看到顯示應用程序運行時間的紅色方塊）。

所以我沒有收到任何錯誤消息，所以我不確定如何找到問題，因為我是移動開發的新手。

任何的想法 ？ 非常感謝 ！

在此處輸入圖片說明

應用程序.xaml

<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d"
             x:Class="Calculette.App">
    <Application.Resources>

    </Application.Resources>
</Application>

應用程序.xaml.cs

using Calculette.Database;
using System;
using System.IO;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

//[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace Calculette
{
    public partial class App : Application
    {
        
        static CalculetteDatabase database;
        public static CalculetteDatabase Database
        {
            get
            {
                if (database == null)
                {
                    
                    database = new CalculetteDatabase(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Calculette.db3"));
        
                }
                return database;
            }
        }

        public App()
        {
            InitializeComponent();
            //MainPage = new MainPage();
            // Pour pouvoir faire apparaitre la toolbaritems
            MainPage = new NavigationPage(new MainPage());
            ((NavigationPage)MainPage).BarBackgroundColor = Color.FromHex("#008A00");
            ((NavigationPage)MainPage).BarTextColor = Color.FromHex("#FFFFFF");
            

        }

        protected override void OnStart()
        {
            // Handle when your app starts
        }

        protected override void OnSleep()
        {
            // Handle when your app sleeps
        }

        protected override void OnResume()
        {
            // Handle when your app resumes
        }
    }
}

適用於 iOS 的 AppDelegate.cs

using System;
using System.Collections.Generic;
using System.Linq;

using Foundation;
using UIKit;

namespace Calculette.iOS

    {
        // The UIApplicationDelegate for the application. This class is responsible for launching the 
        // User Interface of the application, as well as listening (and optionally responding) to 
        // application events from iOS.
        [Register("AppDelegate")]
        public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
        {
            //
            // This method is invoked when the application has loaded and is ready to run. In this 
            // method you should instantiate the window, load the UI into it and then make the window
            // visible.
            //
            // You have 17 seconds to return from this method, or iOS will terminate your application.
            //
            public override bool FinishedLaunching(UIApplication app, NSDictionary options)
            {
    
                Xamarin.Forms.Forms.SetFlags(new string[] { "Expander_Experimental", "SwipeView_Experimental" });
                global::Xamarin.Forms.Forms.Init();
                LoadApplication(new App());
    
                return base.FinishedLaunching(app, options);
            }
        }
    }

適用於 iOS 的 Main.cs

using System;
using System.Collections.Generic;
using System.Linq;

using Foundation;
using UIKit;

    namespace Calculette.iOS
    {
        public class Application
        {
            // This is the main entry point of the application.
            static void Main(string[] args)
            {
                // if you want to use a different Application Delegate class from "AppDelegate"
                // you can specify it here.
                UIApplication.Main(args, null, "AppDelegate");
            }
        }
    }

加載應用程序時調試輸出，然后藍屏關閉，您會看到所有應用程序的初始屏幕

Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Xamarin.iOS.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Mono.Security.dll [External]
Resolved pending breakpoint for 'UIKit.UIApplication.Main(System.String[], System.IntPtr, System.IntPtr)' to /Library/Frameworks/Xamarin.iOS.framework/Versions/13.20.2.2/src/Xamarin.iOS/UIKit/UIApplication.cs:85 [0x00000].
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Calculette.iOS.exe
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Xamarin.Forms.Platform.iOS.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Xamarin.Forms.Core.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/netstandard.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Core.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Xml.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Numerics.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Data.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Transactions.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Data.DataSetExtensions.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Drawing.Common.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.IO.Compression.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.IO.Compression.FileSystem.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.ComponentModel.Composition.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Net.Http.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Runtime.Serialization.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.ServiceModel.Internals.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Web.Services.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Xml.Linq.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Xamarin.Forms.Platform.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Calculette.dll
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/Xamarin.Forms.Xaml.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/XamForms.Controls.Calendar.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Runtime.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Resources.ResourceManager.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Collections.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.ObjectModel.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Threading.Tasks.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Globalization.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Threading.dll [External]
Loaded assembly: /Users/user179537/Library/Developer/CoreSimulator/Devices/CBBD6116-A257-42AB-B54A-9C00DF68934D/data/Containers/Bundle/Application/31B4CC71-FFB9-4A92-946F-B35391E22175/Calculette.iOS.app/System.Runtime.Extensions.dll [External]

主頁.xaml

<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:Calculette"
            xmlns:pv="clr-namespace:Xamarin.Forms.PancakeView;assembly=Xamarin.Forms.PancakeView"
            xmlns:views1="clr-namespace:Calculette.Views"
            xmlns:converters="clr-namespace:Calculette.Converters"
            x:Class="Calculette.MainPage"
            BarBackgroundColor = "White"
            BarTextColor="#008A00">


    <TabbedPage.ToolbarItems>
        <ToolbarItem Icon="logocalculette.png"></ToolbarItem>

        <ToolbarItem></ToolbarItem>
        <ToolbarItem></ToolbarItem>
        <ToolbarItem Text="Calculette de bruit"/>

        <ToolbarItem Text=""></ToolbarItem>
        <ToolbarItem Text="À propos" Order="Secondary"></ToolbarItem>
        <ToolbarItem Text="Références" Order="Secondary"></ToolbarItem>
        <ToolbarItem Text="Mentions légales" Order="Secondary"></ToolbarItem>
        <ToolbarItem Text="Aide" Order="Secondary"></ToolbarItem>
        <ToolbarItem Text="Options" Order="Secondary"></ToolbarItem>
    </TabbedPage.ToolbarItems>


    <views1:TasksGroupPage></views1:TasksGroupPage>
    <local:CalendarPage></local:CalendarPage>




</TabbedPage>

主頁.xaml.cs

using Calculette.ViewModels;
using Calculette.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.PancakeView;
using Calculette.Views;

namespace Calculette
{
    public partial class MainPage : TabbedPage
    {

        public MainPage()
        {

            InitializeComponent();
            Xamarin.Forms.PlatformConfiguration.AndroidSpecific.TabbedPage.SetIsSwipePagingEnabled(this, false);
            

        }


     }
}

1 個解決方案

解決方案1
 1 已采納  2020-08-27 07:15:20

我檢查了本地站點的 repo，發現問題是CalendarPage 。檢查后，問題來自ViewModel 。

CalendarPage的BindingContext是：

public CalendarPage()
{
    InitializeComponent();

    BindingContext = new CalendarPageViewModel();
}

如果注釋BindingContext ，iOS 將顯示視圖。 但是，當單擊CalendarPage選項卡時，視圖將始終保持在那一刻。

在此處輸入圖片說明

因此，問題應該是CalendarPageViewModel 。 檢查后，當new CalendarPageViewModel() ，它將調用一個 Task 線程。 但是， ListViewCollection.ItemsSource重新調用了 Task 線程。 它會死鎖你的 UI 線程。

protected override async void OnAppearing()
{

    base.OnAppearing();
    var vm = this.BindingContext as CalendarPageViewModel;
    Calendar.SelectedDates.Clear();
    vm.Date = null;
    vm.ExpanderBool = false;
    vm.PancakeViewBool = false;
       
    await vm.GetTasks();
    await vm.Initialize();
    ListViewCollection.ItemsSource = vm.Tasks;
}

最后，我找到了一種解決方法可以使應用程序在 iOS 中運行。 我不確定它是否會影響這個項目中的某些功能，因為我不是這個應用程序的設計者，也不熟悉它。

將CalendarPageViewModel的構造方法中的Initialize方法注釋如下：

public CalendarPageViewModel()
{
    //Initialize().GetAwaiter().GetResult();

    DeleteClickedCommand = new Command(new Action<object>(async (obj) =>
    {

        await DeleteClicked(obj);
    }));

    ResultPageClickedCommand = new Command(new Action<object>(async (obj) =>
    {

        await ResultPageClicked(obj);
    }));

    AddTaskButtonClickedCommand = new Command(new Action<object>(async (obj) =>
    {

        await AddTaskButtonClicked(obj);
    }));
}

在 iOS 中它不會顯示任何問題：

在此處輸入圖片說明

==================================更新================ ==================

如果不為標簽欄項添加標題和圖標源，iOS 將不會顯示它們。

MainPage.xml修改如下：

...
<views1:TasksGroupPage Title="TasksGroup" IconImageSource="iconcalendrier.png"></views1:TasksGroupPage>
<local:CalendarPage Title="Calendar" IconImageSource="icontache.png"></local:CalendarPage>
...

不要忘記在 iOS資源文件夾中添加圖標源。

在此處輸入圖片說明

效果：

在此處輸入圖片說明

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