在尝试了多种方法之后，我终于找到了一条设备日志通知，其中显示了以下内容:

After I have tried numerous approaches I finally found a device log notice that printed this:

Time    Device Name Type    PID Tag Message
Oct 24 12:50:41 iPhone-Yuriy    Notice  0   kernel(AppleMobileFileIntegrity)    AMFI: '/private/var/containers/Bundle/Application/4D4359E4-8947-425E-95B4-82AC4D910449/IOS12Test.iOS.app/IOS12Test.iOS' does not pass CT evaluation, result: 0x80008

Oct 24 12:50:41 iPhone-Yuriy    Notice  0   kernel(AppleMobileFileIntegrity)    AMFI: '/private/var/containers/Bundle/Application/4D4359E4-8947-425E-95B4-82AC4D910449/IOS12Test.iOS.app/IOS12Test.iOS': Unrecoverable CT signature issue, bailing out.

在谷歌搜索了一下之后，我遇到了另一个堆栈消息 iOS应用在iOS 12下将无法再在设备上运行:不可恢复的CT签名问题

After googling this a little I came across another stack message iOS app won't run on device any more under iOS 12: Unrecoverable CT signature issue

将苹果全球开发者关系认证中心的权限更改为使用系统默认值后，我便能够启动演示应用程序.

After changing permissions to Apple Worldwide Developer Relations Certification Authority to Use System Defaults I was able to start the demo app.