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我们希望通过在单击i.e ImageViewa 中的 item ( )时替换主控制器来显示另一个控制器cell collection。但是我们无法获得主集合视图，也无法导航目标控制器。我们正在使用以下方法 -

在此处输入图像描述

HomeViewComcontroller.swift

import LBTAComponents

class HomeViewController: DatasourceController {

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.title = "Home"
        collectionView?.contentInset = UIEdgeInsetsMake(50, 0, 0, 0)
        collectionView?.scrollIndicatorInsets = UIEdgeInsetsMake(50, 0, 0, 0)
        collectionView?.backgroundColor = UIColor(r: 232, g: 236, b: 241, a: 1)
        let homeViewDatasource = HomeViewDatasource()
        self.datasource = homeViewDatasource
    }


    override func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

        if indexPath.section == 0 {
            return CGSize(width: view.frame.width, height: 120)
        } else if indexPath.section == 6 {
            return CGSize(width: view.frame.width, height: 120)
        } else {
             return CGSize(width: view.frame.width, height: 200)
            }


    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
            return CGSize(width: view.frame.width, height: 33)
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
        return CGSize(width: view.frame.width, height: 10)
    }


//    lazy var homeMainCatgCell: HomeMainCatgCell = {
//        let homemain = HomeMainCatgCell ()
//        homemain.homeViewcontroller = self
//        return homemain
//    }()


    func handleCtgClick (ctgname: String ,ctgId: String) {

        let dummySettingViewController = UIViewController()
        dummySettingViewController.view.backgroundColor = UIColor.white
        dummySettingViewController.navigationItem.title = ctgname
        navigationController?.navigationBar.tintColor = UIColor.white
        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
        navigationController?.pushViewController(dummySettingViewController, animated: true)

    }

}

主页查看数据源

import LBTAComponents

class HomeViewDatasource: Datasource {

    override func headerClasses() -> [DatasourceCell.Type]? {
         return [HomeMainCatgCellHeader.self,HomeSaleCatgCellHeader.self,HomeNewArrivalCellHeader.self,HomeBestSallingCellHeader.self,HomeBigDiscountCellHeader.self,HomeSpecialOfferCellHeader.self,HomeBrandCellHeader.self]
    }
    override func footerClasses() -> [DatasourceCell.Type]? {
        return[HomeCellsFooter.self]
    }
    override func cellClasses() -> [DatasourceCell.Type] {
        return [HomeMainCatgCell.self,HomeSaleCtagCell.self,HomeNewArrivalsCell.self,HomeBestSallingCatgCell.self,HomeBigDiscountCatgCell.self,HomeSpecialOfferCatgCell.self,HomeBrandVIewCell.self]
    }
    override func numberOfItems(_ section: Int) -> Int {
        return 1
    }
    override func numberOfSections() -> Int {
        return 7
    }
}

HomeMainCatgCell.swift

import LBTAComponents

class HomeMainCatgCell: DatasourceCell {
    var homeViewcontroller: HomeViewController?
    let personalcareCatgImageView: UIImageView = {
        let iv = UIImageView()
        iv.image = #imageLiteral(resourceName: "personalcareimage")
        iv.tag = 0
        iv.contentMode = .scaleToFill
        return iv
    }()

    let healthcareCatgImageView: UIImageView = {
        let iv = UIImageView()
        iv.image = #imageLiteral(resourceName: "healthcareimage")
        iv.contentMode = .scaleToFill
        iv.tag = 1
        return iv
    }()

    let homecareCatgImageView: UIImageView = {
        let iv = UIImageView()
        iv.image = #imageLiteral(resourceName: "homecareimage")
        iv.contentMode = .scaleToFill
        iv.tag = 2
        return iv
    }()

    let kitchencareCatgImageView: UIImageView = {
        let iv = UIImageView()
        iv.image = #imageLiteral(resourceName: "kitchencareiamge")
        iv.contentMode = .scaleToFill
        iv.tag = 3
        return iv
    }()


    override func setupViews() {
        super.setupViews()
        let personalcareCatgImageContainerView = UIView()
        personalcareCatgImageContainerView.backgroundColor = .white

        let homecareCatgImageContainerView = UIView()
        homecareCatgImageContainerView.backgroundColor = .white


        let healthcareCatgImageContainerView = UIView()
        healthcareCatgImageContainerView.backgroundColor = .white


        let kitchencareCatgImageContainerView = UIView()
        kitchencareCatgImageContainerView.backgroundColor = .white


        let imageStackView = UIStackView(arrangedSubviews: [personalcareCatgImageContainerView,homecareCatgImageContainerView,healthcareCatgImageContainerView,kitchencareCatgImageContainerView])
        imageStackView.axis = .horizontal
        imageStackView.distribution = .fillEqually
        addSubview(imageStackView)
        imageStackView.anchor(topAnchor, left: leftAnchor, bottom: self.bottomAnchor, right: self.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: frame.width, heightConstant: frame.height)

        imageStackView.addSubview(personalcareCatgImageView)
        imageStackView.addSubview(healthcareCatgImageView)
        imageStackView.addSubview(homecareCatgImageView)
        imageStackView.addSubview(kitchencareCatgImageView)

        personalcareCatgImageView.anchor(personalcareCatgImageContainerView.topAnchor, left: personalcareCatgImageContainerView.leftAnchor, bottom: personalcareCatgImageContainerView.bottomAnchor, right: personalcareCatgImageContainerView.rightAnchor, topConstant: 5, leftConstant: 5, bottomConstant: 5, rightConstant: 5, widthConstant: personalcareCatgImageContainerView.frame.width , heightConstant: personalcareCatgImageContainerView.frame.width)

          healthcareCatgImageView.anchor(healthcareCatgImageContainerView.topAnchor, left: healthcareCatgImageContainerView.leftAnchor, bottom: healthcareCatgImageContainerView.bottomAnchor, right: healthcareCatgImageContainerView.rightAnchor, topConstant: 5, leftConstant: 5, bottomConstant: 5, rightConstant: 5, widthConstant: healthcareCatgImageContainerView.frame.width , heightConstant: healthcareCatgImageContainerView.frame.width)

          homecareCatgImageView.anchor(homecareCatgImageContainerView.topAnchor, left: homecareCatgImageContainerView.leftAnchor, bottom: homecareCatgImageContainerView.bottomAnchor, right: homecareCatgImageContainerView.rightAnchor, topConstant: 5, leftConstant: 5, bottomConstant: 5, rightConstant: 5, widthConstant: homecareCatgImageContainerView.frame.width , heightConstant: homecareCatgImageContainerView.frame.width)

          kitchencareCatgImageView.anchor(kitchencareCatgImageContainerView.topAnchor, left: kitchencareCatgImageContainerView.leftAnchor, bottom: kitchencareCatgImageContainerView.bottomAnchor, right: kitchencareCatgImageContainerView.rightAnchor, topConstant: 5, leftConstant: 5, bottomConstant: 5, rightConstant: 5, widthConstant: kitchencareCatgImageContainerView.frame.width , heightConstant: kitchencareCatgImageContainerView.frame.width)

        personalcareCatgImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClickCtg)))
        personalcareCatgImageView.isUserInteractionEnabled = true
        healthcareCatgImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClickCtg)))
        healthcareCatgImageView.isUserInteractionEnabled = true
        homecareCatgImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClickCtg)))
        homecareCatgImageView.isUserInteractionEnabled = true
        kitchencareCatgImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClickCtg)))
        kitchencareCatgImageView.isUserInteractionEnabled = true
    }

    func handleClickCtg(gestureRecognizer: UITapGestureRecognizer) {
        var CtgName: String? = nil
        var CtgId: String? = nil
        guard let tag = gestureRecognizer.view?.tag else {return}
        print(tag)
        switch tag {
        case 0:
            CtgName = "Personal Care"
            CtgId = "121"
        case 1:
            CtgName = "Health Care"
            CtgId = "122"
        case 2:
            CtgName = "Home Care"
            CtgId = "123"
        case 3:
            CtgName = "Kitchen Care"
            CtgId = "124"
        default:
            return
        }
        self.homeViewController?.handleCtgClick(ctgname: CtgName! ,ctgId: CtgId!)
    }  
}

主要问题

首先，我没有绑定整个单元格的点击，我只想点击单元格内的 ImageView。因此，为此我将 GestureRecognizer 绑定在图像视图上，例如 -

kitchencareCatgImageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClickCtg)))

点击事件在通过print(tag)内部点击功能打印标签（添加到图像视图中）方面工作正常。但是当调用函数时self.homeViewcontroller.handleCtgClick(ctgname: CtgName! ,ctgId: CtgId!)（函数存在于HomeViewcontroller类中）。它不会改变视图控制器。

我还调试handleCtgClick了函数，发现我得到了HomeViewcontrolleris的对象nil。

提前致谢

4

2 回答 2

1

问题是您的“homeViewcontroller”变量设置不正确。

这段代码：

var homeViewcontroller = HomeViewController()

创建 HomeViewController 类的实例。但是这个实例与你认为的屏幕没有任何关系。呈现您当前视图的屏幕是一个完全不同的实例。

老实说，您链接所有内容的方式非常奇怪，而且不是很直观。但是，如果您想在不过多更改代码的情况下解决问题，则必须向下传递 REAL HomeViewController。

所以在 HomeViewController.swift 你有这个代码：

let homeViewDatasource = HomeViewDatasource()
self.datasource = homeViewDatasource

将“handleCtgClick”作为闭包传递给它。

就像是

homeViewDataSource.presenterClosure = {(ctgname: String ,ctgId: String) in 
        let dummySettingViewController = UIViewController()
        dummySettingViewController.view.backgroundColor = UIColor.white
        dummySettingViewController.navigationItem.title = ctgname
        navigationController?.navigationBar.tintColor = UIColor.white
        navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
        navigationController?.pushViewController(dummySettingViewController, animated: true)
}

（请注意，您必须在 HomeViewDatasource.swift 中创建此闭包变量声明，以便您可以从 HomeViewController.swift 分配它）

然后再次重复此步骤，将其传递给 HomeMainCatgCell.swift

然后，您将能够引用您创建的局部闭包变量来调用此函数。

或者：

您可以将引用传递给 HomeViewController 本身。但是，如果您决定这样做，请确保将其作为具有“弱”属性的“可选”变量继续传递，否则您将创建一个保留循环。

于 2017-04-20T06:42:19.327 回答
1

如果您在单元类中声明控制器的全局实例，这将创建一个引用循环并在您的应用程序中创建一个泄漏。您的单元格将对您的控制器有一个强引用，并且您的控制器将对您的 tableview 有一个强引用，这反过来又保持对单元格的强引用，其次，如果您可能无法告诉单击的单元格的索引路径允许编辑。您可以尝试以下方法来克服这两个问题。

首先，在您的单元类中创建一个枚举，其中包含根据您的图像视图命名的案例，以便您的控制器知道单击了哪个图像视图，并且您也可以将标签链接到它。就像是：

enum CategoryViews:Int{
    case personal = 0,healthcare = 1,homecare = 2,kitchencare = 3
}

然后在您的单元类中创建一个协议，例如：

protocol HomeMainCatgCellDelegate:class{
   func clicked(view:CategoryViews,forCell cell:HomeMainCatgCell)
}

然后在您的单元格类中创建一个弱变量并在您的操作处理程序方法中调用协议方法

class HomeMainCatgCell: DatasourceCell {
     weak var delegate:HomeMainCatgCellDelegate?
     //Remove the variable var homeViewcontroller: HomeViewController? to avoid reference cycle and we don't need it anyway.
 ...
func handleClickCtg(gestureRecognizer: UITapGestureRecognizer) {
    guard let tag = gestureRecognizer.view?.tag else {return}
    print(tag)
    if let clickedImageView = CategoryViews(rawValue:tag){
        self.delegate?.clicked(view:clickedImageView,forCell:self)
    }
}  
}

然后在您的视图控制器类中，您必须确认 HomeMainCatgCellDelegate 协议并将单元格的委托设置为 self。

class HomeViewController: DatasourceController, HomeMainCatgCellDelegate{
...
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
//Dequeue your cell here
 cell.delegate = self
 ...
 return self
}
func clicked(view:CategoryViews,forCell cell:HomeMainCatgCell){
    //And you can handle your events accordingly here
    if let indexpath = self.collectionView.indexPath(for: cell){
    //Here you will get the indexpath of clicked cell and then you can put a switch condition to check which imageview is clicked
          switch view{
          case .personal:break
          case .healthcare:break
          case .homecare:break
          case .kitchencare:break
          }
    }
}
}

希望这可以帮助。

于 2017-04-20T12:09:49.237 回答