Xcode 12、React Native 应用程序，不再显示模拟器
Xcode 12, React Native app, no simulators displayed anymore
我正在开发 React Native 应用程序（已被 expo eject），我最近升级到 Xcode 12，但从那以后我的模拟器从我的不同方案列表中消失了：
但是当我 运行 xcrun simctl list 我可以在列表中看到模拟器和 运行 次 :
== Device Types ==
iPhone 4s (com.apple.CoreSimulator.SimDeviceType.iPhone-4s)
iPhone 5 (com.apple.CoreSimulator.SimDeviceType.iPhone-5)
iPhone 5s (com.apple.CoreSimulator.SimDeviceType.iPhone-5s)
iPhone 6 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus)
iPhone 6 (com.apple.CoreSimulator.SimDeviceType.iPhone-6)
iPhone 6s (com.apple.CoreSimulator.SimDeviceType.iPhone-6s)
iPhone 6s Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6s-Plus)
iPhone SE (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPhone-SE)
iPhone 7 (com.apple.CoreSimulator.SimDeviceType.iPhone-7)
iPhone 7 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-7-Plus)
iPhone 8 (com.apple.CoreSimulator.SimDeviceType.iPhone-8)
iPhone 8 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-8-Plus)
iPhone X (com.apple.CoreSimulator.SimDeviceType.iPhone-X)
iPhone Xs (com.apple.CoreSimulator.SimDeviceType.iPhone-XS)
iPhone Xs Max (com.apple.CoreSimulator.SimDeviceType.iPhone-XS-Max)
iPhone Xʀ (com.apple.CoreSimulator.SimDeviceType.iPhone-XR)
iPhone 11 (com.apple.CoreSimulator.SimDeviceType.iPhone-11)
iPhone 11 Pro (com.apple.CoreSimulator.SimDeviceType.iPhone-11-Pro)
iPhone 11 Pro Max (com.apple.CoreSimulator.SimDeviceType.iPhone-11-Pro-Max)
iPhone SE (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPhone-SE--2nd-generation-)
iPod touch (7th generation) (com.apple.CoreSimulator.SimDeviceType.iPod-touch--7th-generation-)
iPad 2 (com.apple.CoreSimulator.SimDeviceType.iPad-2)
iPad Retina (com.apple.CoreSimulator.SimDeviceType.iPad-Retina)
iPad Air (com.apple.CoreSimulator.SimDeviceType.iPad-Air)
iPad mini 2 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-2)
iPad mini 3 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-3)
iPad mini 4 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-4)
iPad Air 2 (com.apple.CoreSimulator.SimDeviceType.iPad-Air-2)
iPad Pro (9.7-inch) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--9-7-inch-)
iPad Pro (12.9-inch) (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro)
iPad (5th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--5th-generation-)
iPad Pro (12.9-inch) (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---2nd-generation-)
iPad Pro (10.5-inch) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--10-5-inch-)
iPad (6th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--6th-generation-)
iPad (7th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--7th-generation-)
iPad Pro (11-inch) (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--11-inch-)
iPad Pro (12.9-inch) (3rd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---3rd-generation-)
iPad Pro (11-inch) (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--11-inch---2nd-generation-)
iPad Pro (12.9-inch) (4th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---4th-generation-)
iPad mini (5th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-mini--5th-generation-)
iPad Air (3rd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Air--3rd-generation-)
iPad (8th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--8th-generation-)
iPad Air (4th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Air--4th-generation-)
Apple TV (com.apple.CoreSimulator.SimDeviceType.Apple-TV-1080p)
Apple TV 4K (com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-4K)
Apple TV 4K (at 1080p) (com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-1080p)
Apple Watch - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-38mm)
Apple Watch - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-42mm)
Apple Watch Series 2 - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-38mm)
Apple Watch Series 2 - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-42mm)
Apple Watch Series 3 - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-38mm)
Apple Watch Series 3 - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-42mm)
Apple Watch Series 4 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-40mm)
Apple Watch Series 4 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-44mm)
Apple Watch Series 5 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-5-40mm)
Apple Watch Series 5 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-5-44mm)
Apple Watch SE - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-40mm)
Apple Watch SE - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-44mm)
Apple Watch Series 6 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-6-40mm)
Apple Watch Series 6 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-6-44mm)
== Runtimes ==
iOS 14.0 (14.0 - 18A372) - com.apple.CoreSimulator.SimRuntime.iOS-14-0
tvOS 14.0 (14.0 - 18J383) - com.apple.CoreSimulator.SimRuntime.tvOS-14-0
watchOS 7.0 (7.0 - 18R382) - com.apple.CoreSimulator.SimRuntime.watchOS-7-0
如果我在 Xcode 中创建一个新项目，我可以看到模拟器。
我试图将构建、常规和签名设置作为方案设置与另一个看到模拟器的项目进行比较，但找不到任何相关差异。
我可以在设备上构建（所以我猜项目的设置还算不错）。
我还尝试了 Xcode (12.6) 的最新测试版，结果相同。
我做了几次干净的卸载，也重新安装了 XCode 12。
我尝试为 iOS 12.0 和 12.4 安装模拟器，将应用程序的目标设置为 12.0、12.4、14.0。所有模拟器都已安装并可用于其他项目，但未显示用于此项目。
这似乎是一个设置问题，但我无法弄清楚 missing/badly 设置了什么。
我在现有项目中遇到了同样的问题，该项目在 Xcode 11.7 上运行良好。升级到 Xcode 12 后，我无法 select 模拟器。当我创建一个新项目时，我能够 运行 在模拟器中进行该操作，因此我仔细比较了两个项目之间的构建设置。
我注意到新（工作）项目中的 Architectures 值设置为 $(ARCHS_STANDARD) 而我现有项目中的相同值设置为 arm64。将值更改为 $(ARCHS_STANDARD) 解决了问题。
您的项目 select 在 Xcode 中编辑，select 您的构建目标，然后是“构建设置”选项卡。确保 All 而不是 Basic 是 selected 和 select Architectures/Architectures。单击它的值并将其设置为 $(ARCHS_STANDARD)。您可能会发现您可以 select 一个名为“标准体系结构”的值，该值也会将其设置为所需的值。
您现在应该能够 select 从架构 select 或 window 顶部的常用模拟器列表。
就我而言，Xcode 项目中的架构设置似乎在 Xcode 12 UI.
中不再可见
> grep -r VALID_ARCHS ios
ios/MyProject.xcodeproj/project.pbxproj: VALID_ARCHS = "arm64 arm64e";
ios/MyProject.xcodeproj/project.pbxproj: VALID_ARCHS = "arm64 arm64e";
删除那些 vim 然后 re-opening Xcode 中的项目让模拟器再次开始出现。
对我来说，问题是我已经将 iOS Deployment Target to 13.5 设置为最大值 iOS version was 13.4 - 我想我不小心通过代码而不是来自 xcode GUI
打开 YourProj.xcworkspace => 并在项目选项卡下 select 您的项目名称，然后更改 iOS Deployment Target 以匹配您的模拟器已安装的项目名称
我正在开发 React Native 应用程序（已被 expo eject），我最近升级到 Xcode 12，但从那以后我的模拟器从我的不同方案列表中消失了：
但是当我 运行 xcrun simctl list 我可以在列表中看到模拟器和 运行 次 :
== Device Types ==
iPhone 4s (com.apple.CoreSimulator.SimDeviceType.iPhone-4s)
iPhone 5 (com.apple.CoreSimulator.SimDeviceType.iPhone-5)
iPhone 5s (com.apple.CoreSimulator.SimDeviceType.iPhone-5s)
iPhone 6 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus)
iPhone 6 (com.apple.CoreSimulator.SimDeviceType.iPhone-6)
iPhone 6s (com.apple.CoreSimulator.SimDeviceType.iPhone-6s)
iPhone 6s Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6s-Plus)
iPhone SE (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPhone-SE)
iPhone 7 (com.apple.CoreSimulator.SimDeviceType.iPhone-7)
iPhone 7 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-7-Plus)
iPhone 8 (com.apple.CoreSimulator.SimDeviceType.iPhone-8)
iPhone 8 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-8-Plus)
iPhone X (com.apple.CoreSimulator.SimDeviceType.iPhone-X)
iPhone Xs (com.apple.CoreSimulator.SimDeviceType.iPhone-XS)
iPhone Xs Max (com.apple.CoreSimulator.SimDeviceType.iPhone-XS-Max)
iPhone Xʀ (com.apple.CoreSimulator.SimDeviceType.iPhone-XR)
iPhone 11 (com.apple.CoreSimulator.SimDeviceType.iPhone-11)
iPhone 11 Pro (com.apple.CoreSimulator.SimDeviceType.iPhone-11-Pro)
iPhone 11 Pro Max (com.apple.CoreSimulator.SimDeviceType.iPhone-11-Pro-Max)
iPhone SE (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPhone-SE--2nd-generation-)
iPod touch (7th generation) (com.apple.CoreSimulator.SimDeviceType.iPod-touch--7th-generation-)
iPad 2 (com.apple.CoreSimulator.SimDeviceType.iPad-2)
iPad Retina (com.apple.CoreSimulator.SimDeviceType.iPad-Retina)
iPad Air (com.apple.CoreSimulator.SimDeviceType.iPad-Air)
iPad mini 2 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-2)
iPad mini 3 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-3)
iPad mini 4 (com.apple.CoreSimulator.SimDeviceType.iPad-mini-4)
iPad Air 2 (com.apple.CoreSimulator.SimDeviceType.iPad-Air-2)
iPad Pro (9.7-inch) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--9-7-inch-)
iPad Pro (12.9-inch) (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro)
iPad (5th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--5th-generation-)
iPad Pro (12.9-inch) (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---2nd-generation-)
iPad Pro (10.5-inch) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--10-5-inch-)
iPad (6th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--6th-generation-)
iPad (7th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--7th-generation-)
iPad Pro (11-inch) (1st generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--11-inch-)
iPad Pro (12.9-inch) (3rd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---3rd-generation-)
iPad Pro (11-inch) (2nd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--11-inch---2nd-generation-)
iPad Pro (12.9-inch) (4th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Pro--12-9-inch---4th-generation-)
iPad mini (5th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-mini--5th-generation-)
iPad Air (3rd generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Air--3rd-generation-)
iPad (8th generation) (com.apple.CoreSimulator.SimDeviceType.iPad--8th-generation-)
iPad Air (4th generation) (com.apple.CoreSimulator.SimDeviceType.iPad-Air--4th-generation-)
Apple TV (com.apple.CoreSimulator.SimDeviceType.Apple-TV-1080p)
Apple TV 4K (com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-4K)
Apple TV 4K (at 1080p) (com.apple.CoreSimulator.SimDeviceType.Apple-TV-4K-1080p)
Apple Watch - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-38mm)
Apple Watch - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-42mm)
Apple Watch Series 2 - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-38mm)
Apple Watch Series 2 - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-42mm)
Apple Watch Series 3 - 38mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-38mm)
Apple Watch Series 3 - 42mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-3-42mm)
Apple Watch Series 4 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-40mm)
Apple Watch Series 4 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-4-44mm)
Apple Watch Series 5 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-5-40mm)
Apple Watch Series 5 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-5-44mm)
Apple Watch SE - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-40mm)
Apple Watch SE - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-SE-44mm)
Apple Watch Series 6 - 40mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-6-40mm)
Apple Watch Series 6 - 44mm (com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-6-44mm)
== Runtimes ==
iOS 14.0 (14.0 - 18A372) - com.apple.CoreSimulator.SimRuntime.iOS-14-0
tvOS 14.0 (14.0 - 18J383) - com.apple.CoreSimulator.SimRuntime.tvOS-14-0
watchOS 7.0 (7.0 - 18R382) - com.apple.CoreSimulator.SimRuntime.watchOS-7-0
如果我在 Xcode 中创建一个新项目，我可以看到模拟器。
我试图将构建、常规和签名设置作为方案设置与另一个看到模拟器的项目进行比较，但找不到任何相关差异。
我可以在设备上构建（所以我猜项目的设置还算不错）。
我还尝试了 Xcode (12.6) 的最新测试版，结果相同。 我做了几次干净的卸载，也重新安装了 XCode 12。
我尝试为 iOS 12.0 和 12.4 安装模拟器，将应用程序的目标设置为 12.0、12.4、14.0。所有模拟器都已安装并可用于其他项目，但未显示用于此项目。
这似乎是一个设置问题，但我无法弄清楚 missing/badly 设置了什么。
我在现有项目中遇到了同样的问题，该项目在 Xcode 11.7 上运行良好。升级到 Xcode 12 后，我无法 select 模拟器。当我创建一个新项目时，我能够 运行 在模拟器中进行该操作，因此我仔细比较了两个项目之间的构建设置。
我注意到新（工作）项目中的 Architectures 值设置为 $(ARCHS_STANDARD) 而我现有项目中的相同值设置为 arm64。将值更改为 $(ARCHS_STANDARD) 解决了问题。
您的项目 select 在 Xcode 中编辑，select 您的构建目标，然后是“构建设置”选项卡。确保 All 而不是 Basic 是 selected 和 select Architectures/Architectures。单击它的值并将其设置为 $(ARCHS_STANDARD)。您可能会发现您可以 select 一个名为“标准体系结构”的值，该值也会将其设置为所需的值。
您现在应该能够 select 从架构 select 或 window 顶部的常用模拟器列表。
就我而言，Xcode 项目中的架构设置似乎在 Xcode 12 UI.
中不再可见> grep -r VALID_ARCHS ios
ios/MyProject.xcodeproj/project.pbxproj: VALID_ARCHS = "arm64 arm64e";
ios/MyProject.xcodeproj/project.pbxproj: VALID_ARCHS = "arm64 arm64e";
删除那些 vim 然后 re-opening Xcode 中的项目让模拟器再次开始出现。
对我来说，问题是我已经将 iOS Deployment Target to 13.5 设置为最大值 iOS version was 13.4 - 我想我不小心通过代码而不是来自 xcode GUI
打开 YourProj.xcworkspace => 并在项目选项卡下 select 您的项目名称，然后更改 iOS Deployment Target 以匹配您的模拟器已安装的项目名称