swift 5中如何从viewcontroller发送数据到embedded viewcontroller？

Question

I have one viewcontroller where i am using container view and embedding another viewcontroller in that (using storyboard). I am trying pass data from viewcontroller to embedded viewcontroller using prepersegue but not able to do that.

is there any better way to pass data from viewcontroller to embedded viewcontroller.

import UIKit

class ViewMyDiary: UIViewController {

    var alerts = [blogDataModel]() //getting value here from another viewcontroller 


    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(_ animated: Bool) {
         self.performSegue(withIdentifier: "calenderSegue", sender: self);

    }

     func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        if (segue.identifier == "calenderSegue")
        {
            let vc: CalenderViewController = segue.destination as! CalenderViewController
            vc.alerts = alerts
        }
    }
}

for this i am getting error like "There are unexpected subviews in the container view. Perhaps the embed segue has already fired once or a subview was added programmatically?"

Thank you for help

Answer 1

You don't need to do this for embed segue..embed segue fired automatically once or a subview was added programmatically

override func viewWillAppear(_ animated: Bool) {
         self.performSegue(withIdentifier: "calenderSegue", sender: self);

    }

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

     if let vc: CalenderViewController = segue.destination as? CalenderViewController {
          vc.alerts = alerts
      }

 }

remove this code and you are good to go