UIModalPresentationCustom Always present On UIWindow.rootViewController

[davidfuzju]

hi there, I come with a question that, I found with option UIModalPresentationCustom, the presented view controller is always presented on UIWindow.rooViewController. I have no idea to present it on any other specific view contoller. I have tested proprety definesPresentationContext, It seems only work with option UIModalPresentationCurrentContext or UIModalPresentationOverCurrentContext to provide the presenting view controller.