在 swift 中将值从子视图页面传递到 Pageview 控制器

Question

我是 android 开发人员，对 iOS 还很陌生。

我有一个 pageView Controller 说 A。它连接到三个子 View Controller。我想从子视图控制器取回一个值返回到根页面视图控制器。在 android 中，可以通过接口传递轻松完成，但在 iOS 中使用协议会遇到麻烦。

我是这样做的

protocol Z { 
func runZ()
}


Class A: UIViewController, Z {


func runZ( withValue value: String)
{
//Perform some function
}


 var orderedViewControllers: [UIViewController] = {
    var myViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "myViewController") as! MyViewController
    myViewController.z  = self
    return [ myViewController,
             UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "C")]
}()
}


Class B : UIViewController{
var z = A.self
func sendBackToA(){
(z as! Z).runZ(withValue : "CustomString")
}

我在 myViewController.z = self 处收到错误无法将类型“(A) -> () -> A”的值分配给类型 'A.Type'.

我通过像这样初始化使它以某种方式工作

myViewController.z = A.self

但我的应用崩溃了

无法将类型 'A.Type' (0x1e0d854d8) 的值转换为 'Z'

Answer 1

一些事情....

protocol Z {
    func runZ(withValue value: String)
}

class A: UIViewController, Z { // "class" rather than "Class"

    func runZ( withValue value: String)
    {
    //Perform some function
    }

    func orderedViewControllers() -> [UIViewController] {  // func because variable declarations don't have a "self"

        // Should get rid of the forced unwrap in the next line
        let myViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "myViewController") as! B

        myViewController.z  = self
        return [ myViewController, UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "C")]
    }
}

class B : UIViewController { // "class" rather than "Class"
    var z: Z?  // The other controller will do the initialization.
    func sendBackToA(){

        // Verify that the delegate is registered
        if let z = z {
            z.runZ(withValue : "CustomString")
        } else {
            print("Missing delegate assignment")
        }
    }
}

Answer 2

protocol Z:class {
  func runZ(withValue value: String?)
}


class A: UIViewController, Z, UINavigationControllerDelegate {



func runZ(withValue value: String?)
{
//Perform some function
}


 var orderedViewControllers: [UIViewController] = {
    var myViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "B") as! B
    myViewController.z = self
    return [ myViewController,
             UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "C")]
}()
}
   

class B : UIViewController{
    weak var z:Z?
   func sendBackToA(){
    z?.runZ(withValue : "CustomString")
   }
}

在 swift 中将值从子视图页面传递到 Pageview 控制器

Pass value from child view page to Pageview controller in swift

ios

uipageviewcontroller

swift