使用模拟器时执行flutter run 报出下面一大堆错误 注意只有模拟器有这种问题，真机可以正常运行

Oops; flutter has exited unexpectedly.

Sending crash report to Google.

Crash report sent (report ID: 1f4909d52a4fc2ef)

Crash report written to /Users/admin/Tiny/Project/Git/YinHuYiTou/yhyt_app/flutter_21.log;

please let us know at https://github.com/flutter/flutter/issues.

定位到flutter_21.log

flutter run

## exception

ProcessException: ProcessException: Process "/usr/bin/xcrun" exited abnormally:

An error was encountered processing the command (domain=IXUserPresentableErrorDomain, code=1):

This app could not be installed at this time.

Could not hardlink copy /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Containers/Bundle/Application/B2B708AE-0740-4AF0-9766-C736BB51DAE6/Runner.app to /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/Payload/Runner.app with manifest /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/com.apple.deltainstallcommands.com.example.yhytApp

Could not hardlink copy /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Containers/Bundle/Application/B2B708AE-0740-4AF0-9766-C736BB51DAE6/Runner.app to /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/Payload/Runner.app with manifest /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/com.apple.deltainstallcommands.com.example.yhytApp

Underlying error (domain=MIInstallerErrorDomain, code=8):

	Could not hardlink copy /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Containers/Bundle/Application/B2B708AE-0740-4AF0-9766-C736BB51DAE6/Runner.app to /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/Payload/Runner.app with manifest /Users/admin/Library/Developer/CoreSimulator/Devices/5D883DD5-5315-474D-8E19-9E08A9FB5B4D/data/Library/Caches/com.apple.mobile.installd.staging/temp.8C1dZO/extracted/com.apple.deltainstallcommands.com.example.yhytApp

  Command: /usr/bin/xcrun simctl install 5D883DD5-5315-474D-8E19-9E08A9FB5B4D /Users/admin/Tiny/Project/Git/YinHuYiTou/yhyt_app/build/ios/iphonesimulator/Runner.app

找到问题

Could not hardlink copy /Users/admin/Library/Developer/CoreSimulator/Devices

解决问题:

原来是在flutter中设置pubspec.yaml配置文件的时候有一个版本号的设置version: 1.0.0，问题就出在了这里，在iOS中有一个build号的概念，这里默认通过version: 1.0.0+n，通过+n,n代表build号，如果把+n去掉，那么在xcode工程中就没办法获取到build号，build那一行就为空，所有千万不要把+n去掉，

添加上了+n之后，把模拟器上面app先删除掉，再重新安装，即可解决问题

version: 1.0.0+1

参考来源 https://stackoverflow.com/a/45718538

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