ERROR | [iOS] unknown: Encountered an unknown error (Could not find a `ios` simulator (valid values:
環境：
os：Mac os Mojave10.14.4
Cocospod：1.6.0beta
操作：
pod spec lint
錯誤：
ERROR | [iOS] unknown: Encountered an unknown error (Could not find a `ios` simulator (valid values: com.apple.coresimulator.simruntime.ios-12-1, com.apple.coresimulator.simruntime.ios-12-2, com.apple.coresimulator.simruntime.tvos-12-2, com.apple.coresimulator.simruntime.watchos-5-2). Ensure that Xcode -> Window -> Devices has at least one `ios` simulator listed or otherwise add one.) during validation.
資料分析（作者issue）：
很多人發生了這個問題。
https://github.com/CocoaPods/fourflusher/issues/18
https://github.com/CocoaPods/CocoaPods/issues/8458
解決辦法：
1.升級Cocospod
2.更新fourflusher 2.2.0
本文更新到1.6.1解決，更新操作傳送門
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