将变量从页面视图控制器传递到另一个

Posted 2023-03-13

【中文标题】将变量从页面视图控制器传递到另一个

【英文标题】：Passing variables from page view controller to another

【发布时间】：2018-12-21 20:58:12

【问题描述】：

我正在尝试使用UIPageViewController 制作注册表单，因此我正在尝试将变量从子视图传递到另一个视图。

这是我的页面视图控制器：

    class PageViewController: UIPageViewController, UIPageViewControllerDelegate, UIPageViewControllerDataSource 


var pageControl = UIPageControl()

// MARK: UIPageViewControllerDataSource

lazy var orderedViewControllers: [UIViewController] = 
    return [self.newVc(viewController: "First"),
            self.newVc(viewController: "Second"),
            self.newVc(viewController: "Third")]
()

override func viewDidLoad() 
    super.viewDidLoad()
    self.dataSource = self
    self.delegate = self



    // This sets up the first view that will show up on our page control
    if let firstViewController = orderedViewControllers.first 
        setViewControllers([firstViewController],
                           direction: .forward,
                           animated: true,
                           completion: nil)
    

    configurePageControl()

    // Do any additional setup after loading the view.


func configurePageControl() 
    // The total number of pages that are available is based on how many available colors we have.
    pageControl = UIPageControl(frame: CGRect(x: 0,y: UIScreen.main.bounds.maxY - 50,width: UIScreen.main.bounds.width,height: 50))
    self.pageControl.numberOfPages = orderedViewControllers.count
    self.pageControl.currentPage = 0
    self.pageControl.tintColor = UIColor.black
    self.pageControl.pageIndicatorTintColor = UIColor.white
    self.pageControl.currentPageIndicatorTintColor = UIColor.black
    self.view.addSubview(pageControl)


func newVc(viewController: String) -> UIViewController 
    return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: viewController)



// MARK: Delegate methords
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) 
    let pageContentViewController = pageViewController.viewControllers![0]
    self.pageControl.currentPage = orderedViewControllers.index(of: pageContentViewController)!


// MARK: Data source functions.
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? 
    guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else 
        return nil
    

    let previousIndex = viewControllerIndex - 1

    // User is on the first view controller and swiped left to loop to
    // the last view controller.
    guard previousIndex >= 0 else 
        return orderedViewControllers.last
        // Uncommment the line below, remove the line above if you don't want the page control to loop.
        // return nil
    

    guard orderedViewControllers.count > previousIndex else 
        return nil
    

    return orderedViewControllers[previousIndex]


func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? 
    guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else 
        return nil
    

    let nextIndex = viewControllerIndex + 1
    let orderedViewControllersCount = orderedViewControllers.count

    // User is on the last view controller and swiped right to loop to
    // the first view controller.
    guard orderedViewControllersCount != nextIndex else 
        return orderedViewControllers.first
        // Uncommment the line below, remove the line above if you don't want the page control to loop.
        // return nil
    

    guard orderedViewControllersCount > nextIndex else 
        return nil
    

    return orderedViewControllers[nextIndex]

这是我的注册控制器

class RegisterViewController: UIViewController 
var username = ""
var email  = ""
var password = ""
var money = ""
var usn  = ""
@IBOutlet weak var textUsername: UITextField!
@IBOutlet weak var textEmail: UITextField!
@IBOutlet weak var textPassword: UITextField!
@IBOutlet weak var textMoney: UITextField!
@IBOutlet weak var labelUsername: UILabel!


@IBAction func btnValidate(_ sender: Any) 
    username = textUsername.text!
    usn = username
    email = textEmail.text!
    password = textPassword.text!
    print (username)
 //   labelUsername.text = username
  //  API.register(username: username, email: email, password: password)



@IBAction func btnSaveMoney(_ sender: Any) 
    money = String(textMoney.text!)
    print(money)
    print(username)


@IBAction func btnBegin(_ sender: Any) 
//   API.setMoney(money: money, username: username)
//   print(textMoney.text!)
    print("your name"+usn)

override func viewDidLoad() 
    super.viewDidLoad()

    // Do any additional setup after loading the view.



/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
    // Get the new view controller using segue.destination.
    // Pass the selected object to the new view controller.

*/

我的主要目标是将用户名从第一个孩子传递给第二个孩子，这样我就可以使用它来使用网络服务 这些是我的故事板和我的注册表 registration form

storyboard

我试图在第一页上获取用户名、密码和电子邮件，然后将用户名传递到下一个子视图，以便我可以将金额发送到数据库

【问题讨论】：

您可以使用prepare for segue在VC之间传递数据

我问，是否有另一种方法来传递变量扔 pageviewcontroller 孩子

【参考方案1】：

您需要使用以下代码

   override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
        if segue.identifier == "yourSegueIdentiferHere" 
              if let sendData = segue.destination as? destinationVC
            //All the data you want to send to viewController
            
        

    

这个例子是为多个 segue Identifiers 设置的。 如果您有多个标识符，只需继续 if 语句

---

编辑： 如果你不想使用 segues... 也许这对你有用？

override func viewDidLoad() 
    super.viewDidLoad()
    self.delegate=self
    self.dataSource=self
    let childViewController=storyboard?.instantiateViewController(withIdentifier: "some identifier of view") as! ChildViewController
    if let variable = dataToPass 
        print(variable)
    childViewController.variable = dataToPass
    

【讨论】：

问题是不想使用 segues 因为，我使用 pageviewcontroller 所以我滚动扔孩子我没有执行一个动作（点击按钮...）

感谢您的回复，但它与我的情况不兼容。我只是将表单更改为一个 uiviewcontroller

我对你的特殊情况很好奇。如果您可以分享该代码，我将非常感激！