将var从类传递给ViewController

Question

[！[在此输入图像描述] [1]] [1]我想将var postKey值改为另一个名为：ExtraViewController的ViewController。第一个var postKey的值需要放在ExtraViewController的var postKey中。这就是我到目前为止所做的。

var postKey = Database.database().reference().childByAutoId().key

        let ExtraViewController = storyboard?.instantiateViewControllerWithIdentifier("ExtraViewController") as! ExtraViewController

        ExtraViewController.postKey = postKey

  

错误：使用未解析的标识符＆＃39; storyboard＆＃39;错误：预期   声明

Answer 1

您无法创建对象，其名称与任何类ExtraViewController匹配

替换您的代码

    let ExtraViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ExtraViewController") as! ExtraViewController

    ExtraViewController.postKey = postKey

使用

    let extraViewController = self.storyboard?.instantiateViewControllerWithIdentifier("ExtraViewController") as! ExtraViewController

    extraViewController.postKey = postKey

Answer 2

Use this code-

func moveToOtherView()
{
    var postKey = Database.database().reference().childByAutoId().key
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let extraViewController = storyboard?.instantiateViewControllerWithIdentifier("ExtraViewController") as! ExtraViewController
    extraViewController.postKey = postKey
}