ios - How to redraw my view in SWIFT? -

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on ipad app, have uiviewcontroller button open modalview.

@ibaction func showpostcommentviewcontroller(sender: anyobject){      let modalview = uistoryboard(name: "main", bundle: nil).instantiateviewcontrollerwithidentifier("postcommentviewcontroller") as! postcommentviewcontroller     modalview.modaltransitionstyle = uimodaltransitionstyle.coververtical     modalview.modalpresentationstyle = uimodalpresentationstyle.formsheet     modalview.delegate=self     self.presentviewcontroller(modalview, animated: true, completion: nil) }

when close modalview dismissviewcontrolleranimated, "refresh" view controller (because added new content). modal view "formsheet" style, viewdidappear or viewwillappear aren't called.

i tried use setneedsdisplay, doesn't work.

i don't know how do.

this perfect use case delegate pattern.

1) define protocol within postcommentviewcontroller. 

protocol postcommentvcinformationdelegate {     func hasdismissedpostcommentviewcontroller(controller:postcommentviewcontroller) }

2) set delegate variable within postcommentviewcontroller

var delegate: postcommentvcinformationdelegate?

3) when dismiss postcommentviewcontroller, call delegate?.hasdismissedpostcommentviewcontroller(self)

this send information presenting vc.

4) have our presenting view controller conform protocol. 

class viewcontroller: uiviewcontroller, postcommentvcinformationdelegate

5) when presenting modal view:

modalview.delegate = self

6) finally, implement:

func hasdismissedpostcommentviewcontroller(controller: postcommentviewcontroller) {     //update }

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