Swift：将数据从视图控制器传递到导航控制器

Posted 2023-02-23

【中文标题】Swift：将数据从视图控制器传递到导航控制器

【英文标题】：Swift: Pass data from a view controller to a navigation controller

【发布时间】：2019-05-17 15:39:12

【问题描述】：

我想将数据从一个视图控制器传递到另一个视图控制器，但我在它们之间有一个导航控制器，所以有一个“present”函数而不是“performSegue”。

 private func IniciarMainAdmin()
    let mainAdmin = UIStoryboard(name: "Main", bundle: Bundle.main)
    guard let mainAdminNVC = mainAdmin.instantiateViewController(withIdentifier: "NCMainAdmin") as? NCMainAdmin else
        return
    
    present(mainAdminNVC, animated: true, completion: nil)

我已尝试使用此代码，但它对我不起作用：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        let destViewController = segue.destination as! NCMainAdmin
        let secondViewcontroller = destViewController.viewControllers.first as! NCMenuAdmin
        secondViewcontroller.adminUserData = "This is a test"

注意事项：

NCMainAdmin 是导航控制器 NCMenuAdmin 是 Navigation Controller 的第一个 View Controller

谢谢！

【参考方案1】：

要触发您的代码prepare(for，您需要创建从发送方 vc 到导航的 segue，所以要么

 private func IniciarMainAdmin()
    let mainAdmin = UIStoryboard(name: "Main", bundle: Bundle.main)
    guard let mainAdminNVC = mainAdmin.instantiateViewController(withIdentifier: "NCMainAdmin") as? NCMainAdmin else
        return
    
    let first = mainAdminNVC.viewControllers.first as! NCMenuAdmin
    first.adminUserData = "This is a test"
    present(mainAdminNVC, animated: true, completion: nil)

或

self.performSegue(withIdentifier:"id",sender:nil)

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        let destViewController = segue.destination as! NCMainAdmin
        let secondViewcontroller = destViewController.viewControllers.first as! NCMenuAdmin
        secondViewcontroller.adminUserData = "This is a test"