Question

我目前在Collection View Cell中创建了一个Collection View。 集合视图中的集合视图。我无法在第二个视图控制器中的didSelectItemAt上执行segue或呈现视图控制器。现在我尝试过的所有内容都会导致崩溃，或者我在视图层次结构中看不到＆＃34;视图＆＃34;错误。

这是一张图片来解释：

这是我的代码：

收藏视图1：

class ExploreVC: UIViewController, UICollectionViewDataSource,UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {


var businessView: UIViewController!

let foodCategory = exploreCategory()
let shopCategory = exploreCategory()
let cultureCategory = exploreCategory()
let nightlifeCategory = exploreCategory()

@IBOutlet weak var collectionView: UICollectionView!



override func viewWillAppear(_ animated: Bool) {
    collectionView.delegate = self
    collectionView.dataSource = self
    collectionView.backgroundColor = UIColor.clear
    collectionView.register(categoryCell.self, forCellWithReuseIdentifier: "category")

    exploreCategories = exploreCategory.setCategories()
    businessView = storyboard?.instantiateViewController(withIdentifier: "businessPage")

}




 func setCategories() -> [exploreCategory]{


    foodCategory.name = "Good Food"


    shopCategory.name = "Shopping Near You"


    cultureCategory.name = "Cultural Highlights"


    nightlifeCategory.name = "Start Your Night"



    return [foodCategory,shopCategory,cultureCategory,nightlifeCategory]
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "category", for: indexPath) as! categoryCell
    cell.exploreCategory = exploreCategories?[indexPath.item]
    return cell
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if let count =  exploreCategories?.count {

        return count
    }

    return 0 
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let size = CGSize(width: view.frame.width, height: 280)

    return size
}

func gotToBusinessPage() {


    print("gotToBusinessPage is being executed")
    let top: UIViewController? = 
UIApplication.shared.keyWindow?.rootViewController
    let businessPage = BusinessVC()
    top?.performSegue(withIdentifier: "toBusiness", sender: self)
    //top?.present(businessPage, animated: true) { _ in }

    //present(businessPage, animated: true)

}

集合视图1单元格：

import UIKit
import Foundation
import AlgoliaSearch
import SwiftyJSON
import AFNetworking

class categoryCell: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

private let cellId = "exploreCell"

//* MARK Algolia
var exploreSearch = [exploreBusiness]()
var businessIndex: AlgoliaSearch.Index!
let query = Query()
var searchId = 0
var displayedSearchId = -1
var loadedPage: UInt = 0
var nbPages: UInt = 0


//*MARK Set Cell Values
var exploreCategory: exploreCategory? {

    didSet {

        if let name = exploreCategory?.name {

            categoryLabel.text = name.uppercased()


        }

    }

}


//*MARK Init
override init(frame: CGRect) {
    super.init(frame: frame)
    setUpViews()
    searchFood(category: (exploreCategories?[0])!)
    searchShop(category: (exploreCategories?[1])!)
    searchCulture(category: (exploreCategories?[2])!)
    searchNightlife(category: (exploreCategories?[3])!)
}


required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}


//*MARK UI Mark Up
let categoryLabel: UILabel = {

    let black = UIColor(red:0.29, green:0.29, blue:0.29, alpha:1.0)
    let label = UILabel()
    label.font = UIFont(name: "AvenirNext-DemiBold", size: 14)
    label.textColor = black
    label.text = "TRENDING NEAR YOU"
    label.translatesAutoresizingMaskIntoConstraints = false
    label.numberOfLines = 1

    return label

}()

let businessCollectionView: UICollectionView = {

    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .horizontal

    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
    collectionView.translatesAutoresizingMaskIntoConstraints = false
    collectionView.backgroundColor = UIColor.clear
    return collectionView

}()



//* MARK UI Set Up
func setUpViews(){


    addSubview(businessCollectionView)
    addSubview(categoryLabel)

    businessCollectionView.dataSource = self
    businessCollectionView.delegate = self
    businessCollectionView.showsHorizontalScrollIndicator = false


    businessCollectionView.register(exploreCell.self, forCellWithReuseIdentifier: cellId)


    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-16-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": categoryLabel]))

    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": businessCollectionView]))

    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[categoryLabel(24)][v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": businessCollectionView, "categoryLabel": categoryLabel]))

}



//*MARK CollectionView Set Up

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if let count = exploreCategory?.businesses?.count {

        return count

    }

    return 0
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! exploreCell
    cell.business = exploreCategory?.businesses?[indexPath.item]


    return cell
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let size = CGSize(width: 124, height: frame.height - 30)

    return size
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsetsMake(0, 16, 0, 16)
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! exploreCell
    cell.business = exploreCategory?.businesses?[indexPath.item]


    let cellData = cell.business
    businessName = (cellData?.businessName!)!
    businessID = (cellData?.objectID!)!
    businessType = (cellData?.businessType!)!
    zipcode = (cellData?.zipcode!)!
    state = (cellData?.state!)!
    address = (cellData?.address!)!
    city = (cellData?.city!)!
    hours = "\(cellData?.openTime! ?? "error") - \(cellData?.closeTime! ?? "error")"
    if cellData?.image1URL?.isEmpty == false {

        image1 = (cellData?.image1URL!)!
        images.append(image1)

    }

    if cellData?.image2URL?.isEmpty == false {

        image2 = (cellData?.image2URL!)!
        images.append(image2)
    }

    if cellData?.image3URL?.isEmpty == false {

        image3 = (cellData?.image3URL!)!
        images.append(image3)
    }

    if cellData?.image4URL?.isEmpty == false {

        image4 = (cellData?.image4URL!)!
        images.append(image4)
    }

    if cellData?.image5URL?.isEmpty == false {

        image5 = (cellData?.image5URL!)!
        images.append(image5)
    }

    if cellData?.image6URL?.isEmpty == false {

        image6 = (cellData?.image6URL!)!
        images.append(image6)
    }

    if cellData?.image7URL?.isEmpty == false {

        image7 = (cellData?.image7URL!)!
        images.append(image7)
    }



    let tab = ExploreVC()

    tab.gotToBusinessPage()



    }
}

第二次收集查看单元格：

import UIKit
import AlamofireImage
import Alamofire

class exploreCell: UICollectionViewCell {

weak var exploreVC : ExploreVC?
var mainVC = ExploreVC()

var business: exploreBusiness? {

    didSet {


        nameLabel.text = business?.businessName
        reviewLabel.text = "\(business?.reviewCount! ?? 0) Reviews"

        let url = URL(string: (business?.image1URL)!)
        Alamofire.request(url!).responseImage { response in


            if let image = response.result.value {

                self.imageView.image = image


            }
        }


     }

}



override init(frame: CGRect) {
    super.init(frame: frame)
    setUpViews()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

let imageView: UIImageView = {
let iv = UIImageView()

    iv.contentMode = .scaleAspectFill
    iv.layer.cornerRadius = 4
    iv.layer.masksToBounds = true
    return iv

}()

let nameLabel: UILabel = {

    let black = UIColor(red:0.29, green:0.29, blue:0.29, alpha:1.0)
    let label = UILabel()
    label.text = "Paradise Diner"
    label.font = UIFont(name: "AvenirNext-DemiBold", size: 14)
    label.textColor = black
    label.numberOfLines = 2
    return label

}()

let reviewIcon: UIImageView = {
    let iv = UIImageView()
    iv.image = #imageLiteral(resourceName: "review-black")
    iv.contentMode = .scaleAspectFill
    iv.layer.masksToBounds = true
    return iv

}()

let reviewLabel: UILabel = {

    let black = UIColor(red:0.29, green:0.29, blue:0.29, alpha:1.0)
    let label = UILabel()
    label.text = "45 Reviews"
    label.font = UIFont(name: "AvenirNext-DemiBold", size: 14)
    label.textColor = black
    label.numberOfLines = 1
    return label

}()


func setUpViews(){

    addSubview(imageView)
    addSubview(nameLabel)
    addSubview(reviewIcon)
    addSubview(reviewLabel)

    let ImageRect = CGRect(x: 0, y: 0, width: frame.width, height: 182)
    let nameLabelRect = CGRect(x: 0, y: 190 , width: frame.width, height: 20)
    let reviewRect = CGRect(x: 0, y: 220 , width: 16, height: 11)
    let reviewLabelRect = CGRect(x: 22, y: 217 , width: frame.width - 16, height: 16)



    imageView.frame = ImageRect
    nameLabel.frame = nameLabelRect
    reviewIcon.frame = reviewRect
    reviewLabel.frame = reviewLabelRect

    }

}

如果不清楚，我很乐意解释更多。

Answer 1

您的代码存在问题：

let tab = ExploreVC()

这不是要求你当前的ExploreVC这样做，而是要求新创建的实例（这就是它失败的原因）。

要解决此问题（不修改代码太多），您需要做的是：

1）在“categoryCell”中添加一个弱变量来引用你的实际ExploreVC：

weak var exploreVC : ExploreVC?

2）在ExploreVC的“cellForItemAt”中添加对它的引用：

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "category", for: indexPath) as! categoryCell
cell.exploreCategory = exploreCategories?[indexPath.item]
cell.exploreVC = self
return cell

3）在didSelectItem函数内删除“let tab = ExploreVC（）”并改为添加：

exploreVC?.gotToBusinessPage()

从CollectionView Cell以编程方式执行Segue

1 个答案: