无法部署 Xamarin Forms iOS App 它只是在物理设备上不断中断答案

【问题标题】：Unable to deploy Xamarin Froms iOS App it just keeps breaking on physical device无法部署 Xamarin Forms iOS App 它只是在物理设备上不断中断
【发布时间】：2021-08-27 16:55:38
【问题描述】：

这是我第一次尝试向您写请求。多亏了 stackoverflow 和其他人，我通常可以解决大部分问题。

我开发了一个 Xamarin.Forms 应用程序，它可以在 Android 上完美运行，但是当我尝试将它部署到 iOS（物理 iPhone 8）时，它一直在崩溃。

在搜索了几个小时并尝试了不同的事情之后，我希望有人能读出代码是怎么回事......

我也尝试在 appdelegate 或第一页中设置断点，但几秒钟后，一切都因这些信息而中断：

2021-08-27 18:39:24.004 Xamarin.PreBuilt.iOS[4330:1030659] Xamarin.iOS: Successfully received USB connection from the IDE on port 10000, fd: 6

2021-08-27 18:39:24.007 Xamarin.PreBuilt.iOS[4330:1030659] Xamarin.iOS: Processing: 'start profiler: no'
2021-08-27 18:39:24.007 Xamarin.PreBuilt.iOS[4330:1030624] Xamarin.iOS: Profiler not loaded (disabled)

Loaded assembly: /private/var/containers/Bundle/Application/092BCD0C-2FC9-4F1B-A83E-29D87ACD245E/SHAPP.iOS.app/Xamarin.iOS.dll [External]
   
2021-08-27 18:39:24.334 Xamarin.PreBuilt.iOS[4330:1030624] Xamarin.iOS: Unable to locate assembly 'SHAPP' (culture: '')

2021-08-27 18:39:24.334 Xamarin.PreBuilt.iOS[4330:1030624] Xamarin.iOS: Unable to locate assembly 'SHAPP' (culture: '')


Loaded assembly: /private/var/mobile/Containers/Data/Application/6FE32CF0-AE4D-41A2-BBBA-EAD56133AA7E/Documents/SHAPP.iOS.content/Xamarin.Forms.Core.dll [External]
2021-08-27 18:39:24.404 Xamarin.PreBuilt.iOS[4330:1030624] Xamarin.iOS: Unable to locate assembly 'FFImageLoading' (culture: '')

2021-08-27 18:39:24.404 Xamarin.PreBuilt.iOS[4330:1030624] Xamarin.iOS: Unable to locate assembly 'FFImageLoading' (culture: '')

Loaded assembly: /private/var/mobile/Containers/Data/Application/6FE32CF0-AE4D-41A2-BBBA-EAD56133AA7E/Documents/SHAPP.iOS.content/FFImageLoading.Platform.dll [External]
....
[0:] Failed to force load assembly /var/mobile/Containers/Data/Application/6FE32CF0-AE4D-41A2-BBBA-EAD56133AA7E/Documents/SHAPP.iOS.content/Forms9Patch.dll. Type:Forms9Patch.PopupLayerEffect. Exception: 'You must call Xamarin.Forms.Forms.Init(); prior to using this property.'. Callstack: '  at Xamarin.Forms.Device.get_PlatformServices () [0x00007] in D:\a\1\s\Xamarin.Forms.Core\Device.cs:87 
  at Xamarin.Forms.Device.GetAssemblies () [0x00000] in D:\a\1\s\Xamarin.Forms.Core\Device.cs:245 
  at Xamarin.Forms.DependencyService.Initialize () [0x00021] in D:\a\1\s\Xamarin.Forms.Core\DependencyService.cs:103 
  at Xamarin.Forms.DependencyService.Get[T] (Xamarin.Forms.DependencyFetchTarget fetchTarget) [0x00000] in D:\a\1\s\Xamarin.Forms.Core\DependencyService.cs:28 
  at Forms9Patch.Settings.ConfirmInitialization () [0x00008] in C:\Users\ben\Development\Xamarin\Forms9Patch\Forms9Patch\Forms9Patch\Models\Settings.cs:116 
  at Forms9Patch.PopupLayerEffect..cctor () [0x00000] in C:\Users\ben\Development\Xamarin\Forms9Patch\Forms9Patch\Forms9Patch\Effects\PopupLayerEffect.cs:19 '
...
[0:] An error occurred: 'Could not create an native instance of the type 'Airbnb.Lottie.LOTAnimationView': the native class hasn't been loaded.
It is possible to ignore this condition by setting ObjCRuntime.Class.ThrowOnInitFailure to false.'. Callstack: '  at Foundation.NSObject.InitializeObject (System.Boolean alloced) [0x0002e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSObject2.cs:247 
  at Foundation.NSObject..ctor (Foundation.NSObjectFlag x) [0x0000d] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSObject2.cs:147 
  at UIKit.UIResponder..ctor (Foundation.NSObjectFlag t) [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/build/ios/native/UIKit/UIResponder.g.cs:74 
  at UIKit.UIView..ctor (Foundation.NSObjectFlag t) [0x00000] in

... --- 从之前抛出异常的位置结束堆栈跟踪 ---

  at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:86 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:65 
  at SHAPP.iOS.Application.Main (System.String[] args) [0x00001] in C:\VisualCSharp\MyProjects\SHAPP\SHAPP.iOS\Main.cs:17 
  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/corlib/System.Reflection/RuntimeMethodInfo.cs:395 '
Die App wurde beendet.

感谢 Jason 和 Saamer，

正如您所写，我确实尝试在我提出请求之前修复该错误。但我找不到办法。我的 AppDelegate 看起来像这样：

    using Foundation;
using Lottie.Forms.Platforms.Ios;
using UIKit;

namespace SHAPP.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)
        {
            global::Xamarin.Forms.Forms.Init();
            Xamarin.Forms.Forms.Init();
            Forms9Patch.iOS.Settings.Initialize(this);
            FFImageLoading.Forms.Platform.CachedImageRenderer.Init();
            ZXing.Net.Mobile.Forms.iOS.Platform.Init();
           // ObjCRuntime.Class.ThrowOnInitFailure = false;
            LoadApplication(new App());

            //AnimationViewRenderer.Init();

            return base.FinishedLaunching(app, options);
        }
    }
}

所以没什么特别的，我什至尝试设置旧的 Lottie Init，但它没有帮助。同样，我尝试取消 iOS 中的所有 nuget Lottiefiles 并重新安装它们，之后我清理了项目并重新启动构建，同样的错误。

唯一可行的方法是完全取消 Lottieusage。

我使用的 Lottie-XAML 是这样的：

                 <lottie:AnimationView   
                    Animation="14525-plumbers.json"                    
                    AutoPlay="True"
                    RepeatCount="3"
                    RepeatMode="Restart"
                    CacheComposition="True"                   
                    HeightRequest="500"
                    VerticalOptions="Start"
                    HorizontalOptions="Center"
                    IsVisible="true"
                 />

如果我将其注释掉，一切正常。 LottieAnimationfile 位于我的 RessourcesFolder (BundledRessource) 以及主文件夹中。

Folders iOS and LottieFiles

请多多指教，有什么问题吗？提前致谢

【问题讨论】：

有一些非常明显的错误信息——你对它们中的任何一个采取了行动吗？即，“例外：'您必须调用 Xamarin.Forms.Forms.Init(); 在使用此属性之前。'”。

标签： ios xamarin xamarin.forms

【解决方案1】：

正如 Jason 所说，您需要在 AppDelegate 中添加该行，正如您在 this example 中看到的那样

但是您也有另一个错误，因为您可以阅读您共享的 StackTrace 末尾的错误消息：

An error occurred: 'Could not create an native instance of the type 'Airbnb.Lottie.LOTAnimationView': the native class hasn't been loaded.
It is possible to ignore this condition by setting ObjCRuntime.Class.ThrowOnInitFailure to false.'. Callstack: '  at Foundation.NSObject.InitializeObject (System.Boolean alloced) [0x0002e] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSObject2.cs:247 
  at Foundation.NSObject..ctor (Foundation.NSObjectFlag x) [0x0000d] in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSObject2.cs:147

您使用的是什么 Lottie 包？是this one吗？您使用的是最新版本吗？您必须确保将 Lottie 包的 iOS 版本添加到 iOS 项目中。

【讨论】：