ios - 如何使用容器 View 中的分段控件来控制我的主视图

Question

我正在制作一个测验应用程序。我有父 TableView Controller ，它可以处理除分段控件和具有可滚动分段控件的子容器 View 之外的所有内容。我不太明白如何连接父 View Controller 和 subview Controller ，因此我可以使用分段控件来更改问题。

我尝试在子 vc 文件中使用此代码，但它没有提供将段索引与父 vc 中的问题号变量等同的选项。

class ScrollSegmentVC: UIViewController {

    @IBOutlet weak var segmentedControl: UISegmentedControl!

    override func viewDidLoad() {
        super.viewDidLoad()

    }
@IBAction func segmentPressed(_ sender: UISegmentedControl) {
            print(segmentedControl.selectedSegmentIndex)
        if let firstVC = parent as? FirstTableViewController {
        ...    
        }
    }

1

2

更新。我按照建议使用了委托(delegate)方法。一切顺利，但现在我无法将数据传递回容器 View 。

protocol ScrollSegmentDelegate {
    func segmentIsChosen(segment: Int)
}

class ScrollSegmentVC: UIViewController {

    @IBOutlet weak var segmentedControl: UISegmentedControl!

    var delegate: ScrollSegmentDelegate?
    var questionNumberToReceive = 0

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func segmentPressed(_ sender: UISegmentedControl) {
        let segment = segmentedControl.selectedSegmentIndex
        delegate?.segmentIsChosen(segment: segment)
        print("scroll:\(questionNumberToReceive)")
    }

class FirstTestTableViewController: UITableViewController, ScrollSegmentDelegate {

    func segmentIsChosen(segment: Int) {
        print(segment)
        questionNumber = segment + 1
}

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {        
        if segue.identifier == "segment" {
            let destSegmentVC = segue.destination as! ScrollSegmentVC
            destSegmentVC.questionNumberToReceive = questionNumber
            destSegmentVC.delegate = self
        }
    }

无论我在哪里调用segue

performSegue(withIdentifier: "segment", sender: self)

我收到错误:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'There are unexpected subviews in the container view. Perhaps the embed segue has already fired once or a subview was added programmatically?'

如果我在某个时候不调用 segue - 我不会得到更新的变量

Answer 1

我已经找到了解决方案。

class FirstTestTableViewController: UITableViewController, ScrollSegmentDelegate {

    func segmentIsChosen(segment: Int) {
        print(segment)
        questionNumber = segment + 1
}

var questionNumber = 0

func updateQuestionNumber() {
questionNumber + 1
 scrollSegmentVC?.questionNumberToReceive = questionNumber
}

 var scrollSegmentVC: ScrollSegmentVC?

 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {        
        if segue.identifier == "segment" {
            scrollSegmentVC = segue.destination as? ScrollSegmentVC
            scrollSegmentVC?.delegate = self
        }
    }