CODEWITHSUNDEEP
iosiphoneswiftviewcontrollerpopover
fs_tigre
fs_tigre

Reputation: 10738

Pass data back from a popover view controller on iPhone

How can I pass data back from a PopoverViewController to the main view controller on an iPhone?

I know I'm doing something terribly wrong but I cannot figure it out.

Here is the code: PopoverViewController.swift

protocol PopoverViewControllerDelegate {
    func messageData(data: AnyObject)
}

class PopoverViewController: UIViewController {
    @IBOutlet weak var inputMessage: UITextField!
    var delegate: PopoverViewControllerDelegate?

    @IBAction func sendData(sender: AnyObject) {
        if inputMessage.text != ""{
            self.presentingViewController!.dismissViewControllerAnimated(true, completion: nil)
            self.delegate?.messageData(inputMessage.text!)
        }
    }
}

Main ViewController.swift:

class ViewController: UIViewController, UIPopoverPresentationControllerDelegate, PopoverViewControllerDelegate {

    @IBOutlet weak var showData: UILabel!

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // popover segue
        if segue.identifier == "popoverSegue" {

            let popoverViewController = segue.destinationViewController
            popoverViewController.popoverPresentationController!.delegate = self
        }
        // code to comunicate with data in popoverViewController
        let pvc = storyboard?.instantiateViewControllerWithIdentifier("popoverViewController") as! PopoverViewController
        pvc.delegate = self
        self.presentViewController(pvc, animated:false, completion:nil)
    }

    func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
        return UIModalPresentationStyle.None
    }

    func messageData(data: AnyObject) {
        self.showData.text = "\(data)"
    }
}

With the code above I can pass data back to the main view controller without a problem, the issue is that the popover doesn't work, it just acts like a regular ViewController occupying the whole screen.

The funny thing is that if I comment the following line of code the popover works but I can no longer pass data back, I can see the popover but the passing data stops working.

// if I comment this line 
self.presentViewController(pvc, animated:false, completion:nil)

I don't get any errors, one just stops working.

Any suggestions?

Thanks a lot

Upvotes: 4

Views: 1918

Answers (1)

vacawama
vacawama

Reputation: 154563

In prepareForSegue, the destinationViewController is your PopoverViewController. You need to cast it to that and set the delegate on that so that you can pass back data, and you need to set the popoverPesentationController?.delegate as well. You don't need the rest of the code in prepareForSegue:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // popover segue
    if segue.identifier == "popoverSegue" {
        let popoverViewController = segue.destinationViewController as! PopoverViewController
        popoverViewController.delegate = self
        popoverViewController.popoverPresentationController?.delegate = self
    }
}

Upvotes: 2

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