Can not pass Data To ContainerView

Question

I have tried 2 methods to pass the data from ViewController to ContainerView, with and without segue Here is without segue method

ViewController

 class DetailPostBookReviewVC: UIViewController {

        var postid: String!

        @IBAction func Menubutton(_ sender: Any) {

        print(postid!)

        let storyboard = UIStoryboard(name: "Main", bundle: nil)

        let vc = storyboard.instantiateViewController(withIdentifier: "MenuBookReviewVC") as! MenuBookReviewVC

        vc.favpostid = postid
 }

ContainerView

class MenuBookReviewVC: UIViewController {

    var favpostid = String()
     @IBAction func Deletepost(_ sender: Any) {
        print(favpostid)
    }
}

result: favposid has Nill Value

UPDATE this is with segue method

class DetailPostBookReviewVC: UIViewController {

     var postid: String! 

     @IBAction func Menubutton(_ sender: Any) {       
        print(postid!)

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

    if (segue.identifier == "toMenuBookReviewVC") { //"toMenuBookReviewVC" is identifier 

       let vc = segue.destination as! MenuBookReviewVC
        vc.favpostid = postid!
    }
}

Ketan Parmar: i used func prepareForSegue for segue method but failed — Harryng, Feb 14 '20 at 10:51
have you set segue from button to view controller? or view controller to view controller? If you have set vc to vc then you need to call `performSegue` on button click. And make sure you have set `identifier` of the segue and yo're using that identifier in the code! — Ketan Parmar, Feb 14 '20 at 10:55
do you mean I create func prepareFor Segue and create one more func performSegue, putting to Button Action? — Harryng, Feb 14 '20 at 12:22

A. Amini · Answer 1 · 2020-02-14T10:34:04.543

1

Pass your data like. User prepare(for:sender:)

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if
        segue.identifier == "MyIdentifierInStorybiard", // Set that
        let controller = segue.destination as? MenuBookReviewVC {
        controller.favpostid = postid
    }
}

edited Feb 14 '20 at 10:34

answered Feb 14 '20 at 10:23

A. Amini

521
8
15

I have tried this method but unfortunately failed. My container view is a slide up menu. When I click the Menubutton, it will come up. So I think I dont use push viewcontroller – Harryng Feb 14 '20 at 10:47

score 0 · Answer 2 · answered Feb 14 '20 at 11:04

0

I think you postid is not String type so print the null value

answered Feb 14 '20 at 11:04

deepak

78
4

postid is a varible String type I declared on another VC. I did print postid successfully and show the id as String – Harryng Feb 14 '20 at 12:02

score 0 · Answer 3 · answered Sep 13 '20 at 13:39

In this way, you can't pass data for the container view. if in this way without presenting controller and push controller you can use the global variable then direct pass data and use any controller you want to use.

Example

import UIKit

class ViewController: UIViewController {
    
    var postid: String!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        postid = "23" // You change your post ID

    }
    
    @IBAction func Menubutton(_ sender: Any) {

        favpostid = postid
        
    }
        
}



var favpostid : String!

class MenuBookReviewVC: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        print(favpostid)
        
        
    }

}

Vicksheet · Answer 4 · 2020-02-14T11:23:46.717

-2

For Passing Data To Container View you can use this

UserDefaults.standard.set(value, forKey: "SomeKey")

after your data is used you can clear that default value.

UserDefaults.standard.set("", forKey: "SomeKey")

edited Feb 14 '20 at 11:23

answered Feb 14 '20 at 11:17

Vicksheet

13
2

Fatal! Do not do that – A. Amini Feb 14 '20 at 11:29

Can not pass Data To ContainerView

4 Answers4