Retain all popup controllers which are currently presented.
Retain all popup controllers which are currently presented.

RyanTech/STPopup,hieutn/STPopup,mohsinalimat/STPopup,mahong125/STPopup,misterwell/STPopup,jonesgithub/STPopup,shaunstanislaus/STPopup,gabrielPeart/STPopup,sun6boys/STPopup,FelixMLians/STPopup,songbaogang/STPopup,carabina/STPopup,soheilbm/STPopup,kevin0571/STPopup,ajijoyo/STPopup,JonComo/STPopup,Igor-Palaguta/STPopup,germc/STPopup,NghiaTranUIT/STPopup,edison9888/STPopup,PhuocLinh/STPopup,JeeLiu/STPopup,TheBlackApple/STPopup,TimorCan/STPopup,machelix/STPopup,augmify/STPopup