swift 3 prepare(for segue: ) function broken?

ios swift segue swift3
John Durand picture John Durand · Sep 19, 2016 · Viewed 30.4k times · Source

for some odd reason , with swift 3, the prepare(for segue: method refuses to acknowledge the segue identifier. I have the following IBAction's connected to a couple button's on the UI:

@IBAction func goToImagesPicker(_ sender: AnyObject) {
    performSegue(withIdentifier: "showImagePicker", sender: sender)

}

@IBAction func goToNamePicker(_ sender: AnyObject) {
    performSegue(withIdentifier: "showNamePicker", sender: sender)
}

However in my prepare(for segue: method, it doesn't recognize the different segue identifier's, I know so because my console doesn't log the messages I assigned to each:

func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {

        if segue.identifier == "showImagePicker" {

            print("This is the Image Picker")

        }

        if segue.identifier == "showNamePicker"  {

            print("This is the Name Picker")

        } 
}

any suggestions? or is this just a bug?

Answer

dan picture dan · Sep 19, 2016

Your method isn't getting called at all because you have the wrong signature. It was changed in Xcode 8 beta 6 to:

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

Note that the type of sender is Any? instead of AnyObject?. You should have had an error after upgrading Xcode which told you your method wasn't overriding any method from its superclass which should have clued you in before you deleted the override.

Related questions

Programmatically go back to previous ViewController in Swift

I send the user over to a page on a button click. This page is a UITableViewController. Now if the user taps on a cell, I would like to push him back to the previous page. I thought about something …

Read More
IOS - How to segue programmatically using swift

I'm creating an app that uses the Facebook SDK to authenticate users. I'm trying to consolidate the facebook logic in a separate class. Here is the code (stripped for simplicity): import Foundation class FBManager { class func fbSessionStateChane(fbSession:FBSession!, fbSessionState:…

Read More
How to present view controller from right to left in iOS using Swift

I am using presentViewController to present new screen let dashboardWorkout = DashboardWorkoutViewController() presentViewController(dashboardWorkout, animated: true, completion: nil) This presents new screen from bottom to top but I want it to presented from right to left without using UINavigationController. I am …

Read More