我安装了Xcode-11-测试版和macOS 10.15测试版。一开始,我可以正常地玩SwiftUI preview。但是在我尝试将Xcode-beta从我最初安装它的~/Downloads目录移到/Applications之后,预览就无法工作了。下面是错误:

所以我把它移回了~/Downloads,希望事情会像以前一样顺利。但是它给出了同样的错误。
在此之后,我重新安装了它,但我仍然得到这个错误。有人能帮我修一下吗?
诊断报告的内容如下:
== DATE:
Wednesday, June 5, 2019 at 10:25:46 PM China Standard Time
== PENDING U
    PDATE REASONS:
== PREVIEW UPDATE ERROR:
    unexpected error occurred
    Error Domain=com.apple.CoreSimulator.SimError Code=161 "The iOS 13.0 simulator runtime is not available." UserInfo={NSLocalizedRecoverySuggestion=Download the iOS 13.0 simulator runtime from the Components section in Xcode's Preferences., NSLocalizedFailureReason=runtime path not found, NSLocalizedDescription=The iOS 13.0 simulator runtime is not available.}
== VERSION INFO:
    Tools: 11M336w
    OS:    19A471t
== ENVIRONMENT:
    [x] In valid workspace
    [x] Project is using the new build system
        Previews are available for targets that are built with the new build system. Change your project to use the new build system.
    [x] Selected scheme (Landmarks)
        Select a scheme from the scheme picker in the toolbar
    [x] Selected run destination (iPhone 8)
        Select a run destination from the scheme picker in the toolbar
    [x] Have workspace arena
        Try quitting and reopening your workspace
    [x] Have build arena
        Try quitting and reopening your workspace
    [x] Open file has supported build settings发布于 2019-06-06 08:56:36
奇怪的是,我早上醒来,启动了电脑,Canvas和iOS 13.0 Simulator现在可以工作了。
所以,我想解决这个问题的办法可能只是一次残酷的重启。;]
发布于 2019-06-25 12:16:21
CoreSimulator目前不喜欢将simruntime捆绑包从它下面移出。通过从~/Downloads启动,它知道了iOS 13的iOS.simruntime,然后您移动了它。
在这个特定的案例中,你可以通过杀死com.apple.CoreSimulator.CoreSimulatorService来解决这个问题。
发布于 2019-10-31 07:08:24
XCode 11升级以一种我不完全理解的奇怪方式破坏了模拟器-我没有尝试过让模拟器在升级后运行,我也找不到明确的答案来解释为什么会出现这种情况,但以下两个命令为我解决了这个问题:
sudo xcrun simctl shutdown  allsudo xcrun simctl erase allhttps://stackoverflow.com/questions/56462769
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