Passing object with prepareForSegue Swift

Question

I am trying to pass an object to another scene with prepareForSegue()

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObj         


        

Answer 1

In Swift 3, Xcode 8

Just don't use "identifier". I don't know why but "segue.identifier" is always nil. I just used prepare method like this and works!

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let secondController = segue.destination as? SecondController {
        secondController.anyItemInSecondController = self.anyItemInFirstController
    }

Answer 2

You have to give the segue an identifier in the storyboard.(say mySegue)

Using Xcode 10 swift 4.x(Also works with Xcode 9 & 8 , swift 3.x)

override func prepare(for segue: UIStoryboardSegue, sender: Any?){}

Is called for all segues being called from your current UIViewController. So the identifier is to differentiate the different segues

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "mySegue" , 
       let nextScene = segue.destination as? VehicleDetailsTableViewController , 
       let indexPath = self.tableView.indexPathForSelectedRow {
        let selectedVehicle = vehicles[indexPath.row]
        nextScene.currentVehicle = selectedVehicle
    }
}

If you are using Using Xcode 7, swift 2.x

Then use this code:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "mySegue" {
    var nextScene =  segue.destinationViewController as! VehicleDetailsTableViewController

    // Pass the selected object to the new view controller.
    if let indexPath = self.tableView.indexPathForSelectedRow {
        let selectedVehicle = vehicles[indexPath.row]
        nextScene.currentVehicle = selectedVehicle
    }
  }
}

Place a breakpoint after nextScene and see if it is being triggered by clicking any cell in the TableView. If it isn't then the identifier name u provided in the storyboard must be different then the one given here.

Answer 3

What that error is telling you is that segue.destinationViewController isn't a VehicleDetailsTableViewController. We don't have enough details to tell you why.

Check your segues and make sure they're all pointing to the correct place, and always check the identifier of your segue before you perform a cast.

if segue.identifier == "theNameOfYourSegue" // then do your cast

Answer 4

In swift 3.0 Xcode 8 beta 6

AnyObject has been renamed to Any?

override func prepare(for segue: UIStoryboardSegue, sender: Any?){
    let nextScene =  segue.destinationViewController as! VehicleDetailsTableViewController

    // Pass the selected object to the new view controller.
    if let indexPath = self.tableView.indexPathForSelectedRow {
        let selectedVehicle = vehicles[indexPath.row]
        nextScene.currentVehicle = selectedVehicle
    }
  }
}