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解决方案:
在终端执行两行代码:
rm -rf ~/Library/Developer/CoreSimulator/Devices
killall -9 com.apple.CoreSimulator.CoreSimulatorService
重新打开Xcode即可
swift-Xcode7.2新建playground报错Unable to find execution service for selected run destination
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原文地址：http://www.cnblogs.com/hejian2836/p/5451967.html
