如何在"didselectitematindexpatch"中调用单元格类结果页面

Question

我有一个QuestionsObjectCell类，我想单击时打开一个新页面。为此，我创建了另一堂课我想在单击时打电话给这个课程。我该怎么做？

为什么navigationController在didselectitematindex补丁方法中不起作用？我已经研究了几天，但尚未得出结论。

非常感谢。

这是我的单元类：

import UIKit
class QuestionsObjectCell: UICollectionViewCell, UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {
    let questionAppCellId = "questionAppCellId"
    let navi = UINavigationController()
    var questionDetailController: QuestionDetailController?
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupViews()
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    let iconImageView: UIImageView = {
        let icon = UIImageView()
        icon.image = UIImage(named: "function")
        icon.backgroundColor = UIColor.clear
        icon.contentMode = .scaleAspectFill
        icon.translatesAutoresizingMaskIntoConstraints = false
        icon.clipsToBounds = true
        return icon
    }()
    let lineView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(red:0.75, green:0.79, blue:0.81, alpha:1.0)
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    let titleText: UILabel = {
        let label = UILabel()
        label.font = UIFont.boldSystemFont(ofSize: 17)
        label.textColor = UIColor(red:0.53, green:0.55, blue:0.63, alpha:1.0)
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()
    let subtitleText: UILabel = {
        let subTitle = UILabel()
        subTitle.text = "12 subtopics can be viewed"
        subTitle.font = UIFont.boldSystemFont(ofSize: 11)
        subTitle.textColor = UIColor(red:0.82, green:0.84, blue:0.86, alpha:1.0)
        subTitle.translatesAutoresizingMaskIntoConstraints = false
        return subTitle
    }()
    let buttonAsk: UIButton = {
        let ask = UIButton(type: .system)
        ask.setTitle("ask", for: .normal)
        ask.setTitleColor(UIColor(red:0.53, green:0.55, blue:0.63, alpha:1.0), for: .normal)
        ask.translatesAutoresizingMaskIntoConstraints = false
        ask.addTarget(self, action: #selector(handleAskButton), for: .touchUpInside)
        return ask
    }()
    func handleAskButton(){
        print("hkasjhdkas")
    }
    let askArrowImageView: UIImageView = {
        let arrow = UIImageView()
        arrow.image = UIImage(named: "next")
        arrow.contentMode = .scaleAspectFill
        arrow.tintColor = UIColor.red
        arrow.translatesAutoresizingMaskIntoConstraints = false
        return arrow
    }()
    func setupViews() {
        addSubview(iconImageView)
        addSubview(lineView)
        addSubview(titleText)
        addSubview(subtitleText)
        addSubview(buttonAsk)
        addSubview(askArrowImageView)
        addConstraintsWidthFormat(format: "H:|[v0]|", views: iconImageView)
        addConstraintsWidthFormat(format: "V:[v0]|", views: iconImageView)
        addConstraintsWidthFormat(format: "H:|[v0]|", views: lineView)
        addConstraintsWidthFormat(format: "V:[v0]|", views: lineView)
        addConstraintsWidthFormat(format: "H:[v0]|", views: titleText)
        addConstraintsWidthFormat(format: "V:|[v0]|", views: titleText)
        addConstraintsWidthFormat(format: "H:[v0]|", views: subtitleText)
        addConstraintsWidthFormat(format: "V:[v0]|", views: subtitleText)
        addConstraints([NSLayoutConstraint(item: iconImageView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 21)])
        addConstraints([NSLayoutConstraint(item: iconImageView, attribute: .left, relatedBy: .equal, toItem: self, attribute: .left, multiplier: 1, constant: 16)])
        addConstraints([NSLayoutConstraint(item: iconImageView, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 0, constant: 34)])
        addConstraints([NSLayoutConstraint(item: iconImageView, attribute: .height, relatedBy: .equal, toItem: self, attribute: .height, multiplier: 0, constant: 34)])
        addConstraints([NSLayoutConstraint(item: lineView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 19)])
        addConstraints([NSLayoutConstraint(item: lineView, attribute: .left, relatedBy: .equal, toItem: self, attribute: .left, multiplier: 1, constant: 60)])
        addConstraints([NSLayoutConstraint(item: lineView, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 0, constant: 1)])
        addConstraints([NSLayoutConstraint(item: lineView, attribute: .height, relatedBy: .equal, toItem: self, attribute: .height, multiplier: 0, constant: 39)])
        addConstraints([NSLayoutConstraint(item: titleText, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: -10)])
        addConstraints([NSLayoutConstraint(item: titleText, attribute: .left, relatedBy: .equal, toItem: self, attribute: .left, multiplier: 1, constant: 66)])
        addConstraints([NSLayoutConstraint(item: subtitleText, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 21)])
        addConstraints([NSLayoutConstraint(item: subtitleText, attribute: .left, relatedBy: .equal, toItem: self, attribute: .left, multiplier: 1, constant: 66)])
        addConstraints([NSLayoutConstraint(item: buttonAsk, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 20)])
        addConstraints([NSLayoutConstraint(item: buttonAsk, attribute: .right, relatedBy: .equal, toItem: self, attribute: .right, multiplier: 1, constant: -35)])
        addConstraints([NSLayoutConstraint(item: buttonAsk, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 0, constant: 30)])
        addConstraints([NSLayoutConstraint(item: buttonAsk, attribute: .height, relatedBy: .equal, toItem: self, attribute: .height, multiplier: 0, constant: 30)])
        addConstraints([NSLayoutConstraint(item: askArrowImageView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1, constant: 30)])
        addConstraints([NSLayoutConstraint(item: askArrowImageView, attribute: .right, relatedBy: .equal, toItem: self, attribute: .right, multiplier: 1, constant: -15)])
        addConstraints([NSLayoutConstraint(item: askArrowImageView, attribute: .width, relatedBy: .equal, toItem: self, attribute: .width, multiplier: 0, constant: 11)])
        addConstraints([NSLayoutConstraint(item: askArrowImageView, attribute: .height, relatedBy: .equal, toItem: self, attribute: .height, multiplier: 0, constant: 11)])
    }
    let listArray = ["Matematik","Geometri","Fizik","Kimya","Biyoloji","Türkçe","Edebiyat","Tarih","Coğrafya","Felsefe","Din Kültürü","Vatandaşlık","Resim","Müzik","Rehberlik","Yabancı Dil","Yazılım Geliştirme","Robotik","Dizayn Tasarım","Fotoğrafçılık","İşletme","Pazarlama","Sağlık Fitness","Kişisel Gelişim"]
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return listArray.count
    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: questionAppCellId, for: indexPath)
        return cell
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 150, height: 160)
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsetsMake(0, 14, 0, 14)
    }
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {      questionDetailController?.showDetailViewController(questionDetailController!, sender: nil)
        print(91827312)
        let nav = UINavigationController()
        let callPage = ResultPage()
        nav.navigationController?.pushViewController(callPage, animated: true)//THIS IS NOT WORK!
    }
}
class ResultPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

Answer 1

您无法从单元格中调用导航controller，您需要从viewController调用。为此，您需要实施一个代表。

protocol QuestionsObjectCellDelegate
{
    func didSelectItemAtIndex(index:Int)
}

在质疑类别类中，您必须添加：

var delegate: QuestionsObjectCellDelegate?

和此调用didSelect函数：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
delegate?.didSelectItemAtIndex(index:indexPath.row)
    }

在VC中您需要设置：

cell.delegate = cell

并创建didSelect函数委托

小示例：

i有两个VC，VC A和VCB。VCA具有收集视图（其原因是单元格内部的CollectionView），并且当选择单元格内部单元格时，我想推动VC B。

用可怜的词代表来连接事件。当X类中的事件在类中触发时，也会触发委托的事件。

首先：

我在问题上的文件中添加了一个协议：

protocol QuestionsObjectCellDelegate
{
   func didSelectItemAtIndex(index:Int)
} 
class QuestionsObjectCell: UICollectionViewCell, UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout { ... }

第二：

我们需要一个包含事件对象的属性才能触发。该属性命名为委托。

class QuestionsObjectCell: UICollectionViewCell, ... {
  let questionAppCellId = "questionAppCellId"
  let navi = UINavigationController()
  var questionDetailController: QuestionDetailController?
  var delegate: QuestionsObjectCellDelegate?
}

第三：

选择单元格时致电委托：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
{      
      delegate?.didSelectItemAtIndex(index:indexPath.row)
}

第四：

在包含单元格的VC中，我们将协议添加到了类中。这意味着VC现在可以成为我们的协议。

class VCA: UIViewController, QuestionsObjectCellDelegate {...}

将出现警告或错误（目标C或Swift）。此警告说明VC没有协议的功能。

第五

添加协议的函数：

func didSelectItemAtIndex(index:Int)
{
    //In your case: 
    let callPage = ResultPage()
    navigationController?.pushViewController(callPage, animated: true)
    //The VC A need has navigationController.  
}

第六

在CellForiteMat集合中，代表为VC A：

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
{  
   //Configure Cell...
   cell.delegate = self
   ...
 }

=）这就是全部。