ios - Pass data from one view controller to the other using unwind segue with identifier -

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here code: making user able select image phone , want jump previous view controller passing image file too..

@ibaction func unwindtothisviewcontroller(segue: uistoryboardsegue) {      if (segue.identifier == "unwindtothis") {         }  }

if original view controller still loaded in memory can use nsnotification via nsnotificationcenter.

in view controller needs data, in viewdidload:

nsnotificationcenter.defaultcenter().addobserver(self, selector: "imagereceived:", name: "imagereceived", object: self.videodeviceinput?.device)

then add deinit method same controller, remove observer when view controller no longer loaded.

deinit { nsnotificationcenter.defaultcenter().removeobserver(self, name: "imagereceived", object: nil) }

still in same class create method handle notification:

func imagereceived(notification: nsnotification) { if let image = notification.object as? uiimage {  // image stuff here.  } }

in view controller create or data need pass can trigger notification data so: 

nsnotificationcenter.defaultcenter().postnotificationname("imagereceived", object: youruiimage)

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