https://answers.unrealengine.com/questions/48352/how-can-i-get-the-tarray-index-on-posteditchangepr.html
https://forums.unrealengine.com/showthread.php?6599-OnPropertyChanged-or-similiar-does-it-exist
原文：http://www.cnblogs.com/blueroses/p/5193955.html