Xamarin.iOS：Visual Studio 2019 更新后无法运行

Question

我遇到了一个奇怪的情况，

更新 Visual Studio 2019 后，我无法运行 iOS 中的应用程序，当我尝试从 [=46] 运行时发生这种情况=] 计算机链接到 Mac。但是当我运行应用程序使用 Visual Studio 作为 Mac 而不是 windows 时，应用程序运行没有问题。

我查看了 Xcode 的 VS 配置和路径并且是正确的 (/Applications/Xcode.app)。Mac 上的路径存在并且可以访问。

我尝试了以下解决方案，但它不起作用：打开模拟器 --> 点击顶部菜单 Simulator --> 点击 **Reset Content and Settings.... ** 同样在 Windows 和 Mac 中，架构都是 x86_64.

Windows 计算机： Visual Studio2019专业版16.3.7 Xamarin.iOS 和 Xamarin.Mac SDK - 13.4.0.2 (e37549b)

Mac: Visual Studio Mac 2019 企业版 8.3.5（内部版本 13） Xcode11.2 (11B52) Xamarin.iOS 和 Xamarin.Mac SDK - 13.4.0.2 (e37549bc)

VS 在 Windows 上的输出：输出控制台：该应用程序已终止。启动失败。应用 'AppName' 无法在 'iPhone 11 iOS 13.2' 上启动。错误：错误 HE0042：无法在设备 'iOS 13.2 (17B84) - iPhone 11' 上启动应用程序 'PackageName'：打开 "PackageName" 的请求失败。请查看日志以获取更多详细信息。该应用程序已终止。

构建输出：

Using Xcode 11.2 found in /Applications/Xcode.app/Contents/Developer
Xamarin.Hosting: Xamarin.Hosting
Xamarin.Hosting:     Version: 3064e2c463 (d16-3)
Xamarin.Hosting:     Xcode: /Applications/Xcode.app
Xamarin.Hosting:     Xcode Version: 11.2
Xamarin.Hosting:     Verbosity: 1
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTFoundation.framework/Versions/A/DVTFoundation
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTiPhoneSimulatorRemoteClient.framework/DVTiPhoneSimulatorRemoteClient
Xamarin.Hosting: Loaded /Library/Developer/PrivateFrameworks/CoreSimulator.framework/CoreSimulator
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DTDeviceKitBase.framework/DTDeviceKitBase
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/DVTKit
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DTDeviceKit.framework/DTDeviceKit
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DTXConnectionServices.framework/DTXConnectionServices
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTSourceControl.framework/DVTSourceControl
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTServices.framework/DVTServices
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTPortal.framework/DVTPortal
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTDocumentation.framework/DVTDocumentation
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTAnalyticsClient.framework/DVTAnalyticsClient
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/DVTAnalytics.framework/DVTAnalytics
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/SourceKit.framework/SourceKit
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/Frameworks/IDEFoundation.framework/IDEFoundation
Xamarin.Hosting: Loaded /Applications/Xcode.app/Contents/SharedFrameworks/IDEProducts.framework/IDEProducts
Xamarin.Hosting: Simulator watchdogs are not disabled for 'iOS 13.2 (17B84) - iPhone 11'.
Xamarin.Hosting: Shutting down simulator...
Xamarin.Hosting: Successfully disabled simulator watchdogs for 'iOS 13.2 (17B84) - iPhone 11'.
Xamarin.Hosting: Launching simulator application 'com.apple.iphonesimulator'
Xamarin.Hosting: Booting iPhone 11...
Xamarin.Hosting: Booted iPhone 11 successfully.
Xamarin.Hosting: No need to boot (already booted): iPhone 11
Xamarin.Hosting: Installing /Users/angyay0/Library/Caches/Xamarin/mtbs/builds/App.iOS/fb8bb79d47458ad099aab10c40ce7836/bin/iPhoneSimulator/Debug/App.iOS.app with Bundle Identifier PackageName on 'iOS 13.2 (17B84) - iPhone 11'...
Xamarin.Hosting: Installed 'PackageName' from /Users/angyay0/Library/Caches/Xamarin/mtbs/builds/App.iOS/fb8bb79d47458ad099aab10c40ce7836/bin/iPhoneSimulator/Debug/App.iOS.app
Xamarin.Hosting: Could not find any potentially troublesome weak load commands.
Xamarin.Hosting: The bundle id PackageName was successfully installed.
Xamarin.Hosting: Creating shared memory for:
__XAMARIN_DEBUG_PORT__=59082
Xamarin.Hosting: Created shared memory id: 65536
Xamarin.Hosting: Mapped shared memory: 0x1091ff000 for key 301399 and id 65536
Xamarin.Hosting: Launching com.hebmex.sg on 'iOS 13.2 (17B84) - iPhone 11'
Xamarin.Hosting: Could not launch the app 'PackageName' on the device 'iOS 13.2 (17B84) - iPhone 11': The request to open "PackageName" failed., will try to reinstall the app
Xamarin.Hosting: Created shared memory token: 301399
Xamarin.Hosting: Installing /Users/angyay0/Library/Caches/Xamarin/mtbs/builds/App.iOS/fb8bb79d47458ad099aab10c40ce7836/bin/iPhoneSimulator/Debug/App.iOS.app with Bundle Identifier PackageName on 'iOS 13.2 (17B84) - iPhone 11'...
Xamarin.Hosting: Installed 'PackageName' from /Users/angyay0/Library/Caches/Xamarin/mtbs/buildsApp.iOS/fb8bb79d47458ad099aab10c40ce7836/bin/iPhoneSimulator/Debug/App.iOS.app
Xamarin.Hosting: Could not find any potentially troublesome weak load commands.

Answer 1

终于解决了

Windows 和 CoreSimulator.Framework 上的 VS 之间存在通信错误。

i 运行以下命令从终端重新安装 CoreSimulator.Framework：

sudo rm -Rf /Library/Developer/PrivateFrameworks/CoreSimulator.framework/Versions/*
/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -runFirstLaunch

然后 Xamarin.iOS 项目的配置正在更改调试端口（新端口），通过 iOS 运行选项将执行模式设置为默认无后台获取。

希望对其他人有帮助。

Answer 2

这对我有用：

更新 Visual Studio 至 16.11.2
在 'iOS Build' 下 Visual Studio 的 iOS 项目属性中，我检查了 'Use the concurrent garbage collector'。

Xamarin.iOS：Visual Studio 2019 更新后无法运行

Xamarin.iOS: Cannot run after Visual Studio 2019 Update

windows

xamarin.ios

ios-simulator

xamarin.forms

visual-studio-2019

Xamarin.iOS：Visual Studio 2019 更新后无法 运行

Xamarin.iOS: Cannot run after Visual Studio 2019 Update

windows

xamarin.ios

ios-simulator

xamarin.forms

visual-studio-2019

Xamarin.iOS：Visual Studio 2019 更新后无法运行