cocoapods 做库的时候报如下错误Could not find a `ios` simulator解决

2019年6月19日
1.cocoapods 做库的时候报如下错误Could not find a ios simulator解决

- ERROR | [iOS] unknown: Encountered an unknown error (Could not find a `ios` simulator (valid values: com.apple.coresimulator.simruntime.ios-11-2, com.apple.coresimulator.simruntime.ios-8-1, com.apple.coresimulator.simruntime.ios-9-0, com.apple.coresimulator.simruntime.ios-9-3). Ensure that Xcode -> Window -> Devices has at least one `ios` simulator listed or otherwise add one.

解决

1. sudo gem update cocoapods
   成功：
   
   

   image.png
   
   参考：https://stackoverflow.com/questions/52742003/cocoapods-cant-find-simulators-pod-repo-push-fails

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