ios - 使用 pushViewController 传递数据？

Question

使用这段代码，我能够“继续”到我的 View Controller 的同一个实例

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "DetailVC")
    self.navigationController?.pushViewController(vc, animated: true)


}

但是，我该如何传递数据呢？我只知道如何使用 segue 选项传递数据。当我用它运行代码时，我得到了 nil 错误，因为新的实例化 View Controller 无法读取数据。

Answer 1

例如我在这里添加，详细说明可以从here获取教程

class SecondViewController: UIViewController {

var myStringValue:String?

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    // We will simply print out the value here
    print("The value of myStringValue is: \(myStringValue!)")
}

并将字符串发送为

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "DetailVC") as! SecondViewController
      vc.myStringValue = "yourvalue"

    self.navigationController?.pushViewController(vc, animated: true)


}