Ios 如何在UIPageViewController中的两个ViewController之间传递数据

我有两个UIViewController，A和B，我在UIPageViewController中连接它们：

下面是它在故事板中的外观：

---

我不知道如何从A向B传递数据。

好吧，假设您有一些类（您应该提供这些类），如：

现在，您需要page view controller的子类，该子类控制数据，以便override view加载以创建模型：

var myModel: MyModel!

override func viewDidLoad() {
    super.viewDidLoad()
    self.myModel = MyModel()
}

现在，在生成或获取视图控制器时，只需将相同的模型分配给它们：

func getFirstViewController() -> UIViewController {
    let controller = MyFirstController.generate()
    controller.myModel = self.myModel
    return controller
}

func getSecondViewController() -> UIViewController {
    let controller = MySecondController.generate()
    controller.myModel = self.myModel
    return controller
}

---

现在，所有3个视图控制器共享同一个模型。这可能是最简单的方法，但有很多方法。最干净的方法可能是使用委托，委托将报告给页面控制器，然后再报告给给定的视图控制器。

我在找到解决方案时遇到了一些困难，我自己使用委托想出了一些办法。欢迎提出建议

在发送数据的ViewController中，定义代理，如下所示：

protocol FirstVCDelegate {  
    func foo(someData: String)  
}  

class FirstViewController: UIViewController {  
    var delegate: FirstVCDelegate?  

    ....  

    func someMethod() {  
        delegate?.foo("first VC")  
    }  

}  

class PageViewController: UIPageViewController, ... {  
    var myViewControllers = [UIViewController]()  

override func viewDidLoad() {  
    let firstVC = storyboard?.instantiateViewController(withIdentifier: "FirstViewController") as! FirstViewController  
    let secondVC = storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController  

    firstVC.delegate = secondVC  

     myViewControllers.append(firstVC)  
     myViewControllers.append(secondVC)  

}  

// MARK: - PageVC Delegate / Datasource   
....

class SecondViewController: UIViewController, FirstVCDelegate {  

....  

    func foo(data: String) { // This method is triggered from FirstViewController's delegate?.foo("first VC")  
        print(data)  // "first VC" will be printed  
    }  
}  

在PageViewController中，按如下方式设置视图控制器：

protocol FirstVCDelegate {  
    func foo(someData: String)  
}  

class FirstViewController: UIViewController {  
    var delegate: FirstVCDelegate?  

    ....  

    func someMethod() {  
        delegate?.foo("first VC")  
    }  

}  

class PageViewController: UIPageViewController, ... {  
    var myViewControllers = [UIViewController]()  

override func viewDidLoad() {  
    let firstVC = storyboard?.instantiateViewController(withIdentifier: "FirstViewController") as! FirstViewController  
    let secondVC = storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController  

    firstVC.delegate = secondVC  

     myViewControllers.append(firstVC)  
     myViewControllers.append(secondVC)  

}  

// MARK: - PageVC Delegate / Datasource   
....

class SecondViewController: UIViewController, FirstVCDelegate {  

....  

    func foo(data: String) { // This method is triggered from FirstViewController's delegate?.foo("first VC")  
        print(data)  // "first VC" will be printed  
    }  
}  

最后，接收ViewController实现委托，如下所示：

protocol FirstVCDelegate {  
    func foo(someData: String)  
}  

class FirstViewController: UIViewController {  
    var delegate: FirstVCDelegate?  

    ....  

    func someMethod() {  
        delegate?.foo("first VC")  
    }  

}  

class PageViewController: UIPageViewController, ... {  
    var myViewControllers = [UIViewController]()  

override func viewDidLoad() {  
    let firstVC = storyboard?.instantiateViewController(withIdentifier: "FirstViewController") as! FirstViewController  
    let secondVC = storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController  

    firstVC.delegate = secondVC  

     myViewControllers.append(firstVC)  
     myViewControllers.append(secondVC)  

}  

// MARK: - PageVC Delegate / Datasource   
....

class SecondViewController: UIViewController, FirstVCDelegate {  

....  

    func foo(data: String) { // This method is triggered from FirstViewController's delegate?.foo("first VC")  
        print(data)  // "first VC" will be printed  
    }  
}  

祝你好运

---

亚伦

我还有一个问题。如何将A或B的数据传递给UIPageViewController？@JakeTo从我建议的系统中，页面视图控制器已经通过

self.myModel

获得了该数据。如果您需要发回消息，我建议您执行一个委托程序。因此，创建一个类似于MyFirstViewControllerDelegate的

协议

，并添加所需的方法。然后在第一视图控制器中添加一个变量

弱变量委托：MyFirstViewControllerDelegate

，并通过

controller.delegate=self

将页面视图控制器指定为

getFirstViewController

中的委托。。。