无法启动 iOS 模拟器：错误：模拟器在 60 秒内未连接

Question

Flutter doctor -v（运行和不运行 ios 模拟器的结果相同）

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flutter doctor -v\n[\xe2\x9c\x93] Flutter (Channel stable, 2.2.3, on Mac OS X 10.14.6 18G103 darwin-x64, locale en-US)\n    \xe2\x80\xa2 Flutter version 2.2.3 at /Users/faizan/Developer/flutter\n    \xe2\x80\xa2 Framework revision f4abaa0735 (8 weeks ago), 2021-07-01 12:46:11 -0700\n    \xe2\x80\xa2 Engine revision 241c87ad80\n    \xe2\x80\xa2 Dart version 2.13.4\n\n[\xe2\x9c\x93] Android toolchain - develop for Android devices (Android SDK version 31.0.0)\n    \xe2\x80\xa2 Android SDK at /Users/faizan/Library/Android/sdk\n    \xe2\x80\xa2 Platform android-31, build-tools 31.0.0\n    \xe2\x80\xa2 ANDROID_HOME = /Users/faizan/Library/Android/sdk\n    \xe2\x80\xa2 Java binary at: /Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/bin/java\n    \xe2\x80\xa2 Java version Java(TM) SE Runtime Environment (build 1.8.0_301-b09)\n    \xe2\x80\xa2 All Android licenses accepted.\n\n[!] Xcode - develop for iOS and macOS\n    \xe2\x80\xa2 Xcode at /Applications/Xcode.app/Contents/Developer\n    \xe2\x80\xa2 Xcode 10.1, Build version 10B61\n    \xe2\x9c\x97 Xcode 10.1.0 out of date (12.0.1 is recommended).\n      Download the latest version or update via the Mac App Store.\n    \xe2\x80\xa2 CocoaPods version 1.10.2\n\n[\xe2\x9c\x93] Chrome - develop for the web\n    \xe2\x80\xa2 Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome\n\n[!] Android Studio (version 2020.3)\n    \xe2\x80\xa2 Android Studio at /Applications/Android Studio.app/Contents\n    \xe2\x80\xa2 Flutter plugin can be installed from:\n       https://plugins.jetbrains.com/plugin/9212-flutter\n    \xe2\x80\xa2 Dart plugin can be installed from:\n       https://plugins.jetbrains.com/plugin/6351-dart\n    \xe2\x9c\x97 Unable to find bundled Java version.\n    \xe2\x80\xa2 Try updating or re-installing Android Studio.\n\n[\xe2\x9c\x93] VS Code (version 1.59.1)\n    \xe2\x80\xa2 VS Code at /Applications/Visual Studio Code.app/Contents\n    \xe2\x80\xa2 Flutter extension version 3.25.0\n\n[\xe2\x9c\x93] Connected device (2 available)\n    \xe2\x80\xa2 macOS (desktop) \xe2\x80\xa2 macos  \xe2\x80\xa2 darwin-x64     \xe2\x80\xa2 Mac OS X 10.14.6 18G103 darwin-x64\n    \xe2\x80\xa2 Chrome (web)    \xe2\x80\xa2 chrome \xe2\x80\xa2 web-javascript \xe2\x80\xa2 Google Chrome 92.0.4515.159\n\n! Doctor found issues in 2 categories.\n

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即使我启动了 ios 模拟器，vscode 底部选项卡中也没有设备。android studio 也会发生同样的情况

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我尝试了 12.0.1 xcode 和 10.1（带或不带命令行工具）

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Answer 1

转到系统活动监视器，搜索simulator，双击它，然后退出 ==> 然后再退出。

之后应该会起作用。不知道为什么会这样，但这不是第一次了，断断续续地发生。