Question

我正在从视图控制器切换到TabbarController，我想传递数据。我想将“ sendAuthor”传递给tabbarcontroller的第一个视图控制器。

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if segue.identifier == "FirstVC" {

  let vc = (segue.destination as? UITabBarController)?.viewControllers?.first as? CommentProfileViewController

    vc?.sendAuthor = sendAuthor!
    vc?.Username.text = sendAuthor!

        print(sendAuthor!)
    }



    }

为了确保我得到正确的信息，我添加了一条打印语句print(sendAuthor!)，并且得到了正确的打印语句。我还在目标视图控制器中包含了一条print语句，但是该打印语句返回nil

var sendAuthor: String?

override func viewDidLoad() {
        super.viewDidLoad()
print(self.sendAuthor)

}

Answer 1

您的VC嵌入在UINavigationController中。您还需要考虑到这一点：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if segue.identifier == "FirstVC" {
       guard let tabbar = segue.destination as? UITabBarController,
             let navcon = tabbar.viewControllers?.first as? UINavigationController,
             let vc = navcon.topViewController as? CommentProfileViewController
             else { return }

       vc.sendAuthor = sendAuthor!
       vc.Username.text = sendAuthor!

       print(sendAuthor!)
    }
}

将数据从视图控制器传递到tabbarviewcontroller

1 个答案: