Fix issue #19 by checking if there is any presentedViewController and assigning it as topController.
Fix issue #19 by checking if there is any presentedViewController and assigning it as topController.

ajrulez/FlatUIKit,zyprosoft/FlatUIKit,GuanKunLuo/FlatUIKit,lydonchandra/FlatUIKit,yungfan/FlatUIKit,algoaccess/FlatUIKit,ChaosCoder/FlatUIKit,lioonline/FlatUIKit,nathankot/FlatUIKit,hanangellove/FlatUIKit,yangchenghu/FlatUIKit,0x73/FlatUIKit,imjerrybao/FlatUIKit,fromeflow/FlatUIKit,hieutn/FlatUIKit,tfrank64/FlatUIKit,Grouper/FlatUIKit,tuanpa199/FlatUIKit,applexiaohao/FlatUIKit,SummerHanada/FlatUIKit,hessu/FlatUIKit,AmitaiB/FlatUIKit,brextonpham/FlatUIKit,somedev/FlatUIKit