错误原因：
Xcode9后出现的BUG弹出警告框.
解决方法：
Xocde—>Window menu—>Device and Simulators—>Device—>Button at bottom left corner—>Next—>Done
或者退出xcode,重启手机.
Xcode10真机测试出现：iPhone is busy: Preparing debugger support for iPhone?
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转载自blog.csdn.net/yuhao309/article/details/80927064
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