Is there a possibility to do something AFTER a query is done? I have a PFQuery that queries objects, the objectIds of these objects will be apendet to an Array. materUserObjects is an PFUser, MatesIdsAndNames is a dictionary, the rest are String `func queryNow(){Is there a possibility to do something AFTER a
阅读背景：
在PFQuery完成后启动一些东西
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