ios UISearchController ios 11.4.1版本 Application tried to present modal view controller on itself

最近发现bugly记录了这样的bug,都集中在了ios 11.4.1版本上面,并且只出现了 2次，无法复现，所以就是看代码，各种查阅了,最后找了这么一个有用的文章https://stackoverflow.com/questions/31487824/error-application-tried-to-present-modal-view-controller-on-itself-while-a

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