无法将数据传递到ContainerView

Question

我尝试了2种方法来将数据从ViewController传递到ContainerView，并带有和不带有segue这里没有segue方法

ViewController

类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)
}

}

结果favposid具有Nill值

Answer 1

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