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我有一个表视图单元格内的集合视图。该模型是按愿望清单名称分组的愿望清单项目。可能有许多愿望清单。当用户选择愿望清单时，他们会得到一系列希望清单，但我希望在单元中显示愿望清单的项目图像预览。它们不是单独选择的，单元格选择将转到选定愿望清单的项目列表。同样，我会用滑动删除动作删除整个愿望清单。UITableViewCell中的Swift UICollectionView无法正常工作
这里我的问题是，collectionView函数根本不会触发。我正在测试的源数据有一个愿望清单和4个项目。
这是我的TableViewCell。
import Foundation
import UIKit
import Alamofire
import AlamofireImage
class WishListsCell: UITableViewCell {
var collectionView: UICollectionView!
let screenWidth = UIScreen.main.bounds.width
var alamofireRequest: Alamofire.Request?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
layout.itemSize = CGSize(width: screenWidth, height: ((screenWidth/4) * Constants.IMAGE_ASPECT_RATIO))
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
layout.estimatedItemSize.height = ((screenWidth/4) * Constants.IMAGE_ASPECT_RATIO)
layout.estimatedItemSize.width = screenWidth
collectionView = UICollectionView(frame: contentView.frame, collectionViewLayout: layout)
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(WishListsCollectionViewCell.self, forCellWithReuseIdentifier: cellId)
self.contentView.addSubview(collectionView)
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension WishListsCell: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
debugPrint(wishListItems.count)
return wishListItems.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "WishListsCollectionViewCell", for: indexPath) as! WishListsCollectionViewCell
if let imageUrl = wishListItems[indexPath.row]["image"] as? String {
debugPrint(imageUrl)
cell.imageView.image = nil
if let image = ShoppingManager.sharedManager.photoCache.image(withIdentifier: imageUrl) {
cell.imageView.image = image
}
else
{
cell.alamofireRequest?.cancel()
cell.alamofireRequest = Alamofire.request(imageUrl)
.responseImage { response in
let img = response.result.value
cell.imageView.image = img
cell.imageView.contentMode = UIViewContentMode.scaleAspectFit
let imageWidth:CGFloat = self.screenWidth/4
let imageHeight:CGFloat = imageWidth * Constants.IMAGE_ASPECT_RATIO
cell.imageView.frame.size.width = imageWidth
cell.imageView.frame.size.height = imageHeight
ShoppingManager.sharedManager.photoCache.add(img!, withIdentifier: imageUrl)
}
}
}
return cell
}
}
这里是我的CollectionViewCell：
import Foundation
import UIKit
import Alamofire
import AlamofireImage
class WishListsCollectionViewCell: UICollectionViewCell {
var alamofireRequest: Alamofire.Request?
var imageView: UIImageView
let screenWidth = UIScreen.main.bounds.width
override init(frame: CGRect) {
imageView = UIImageView()
super.init(frame: frame)
contentView.addSubview(imageView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.contentMode = .scaleAspectFit
NSLayoutConstraint.activate([
NSLayoutConstraint(item: imageView, attribute: .width, relatedBy: .equal,
toItem: nil, attribute: .width,
multiplier: 1.0, constant: screenWidth/4),
NSLayoutConstraint(item: imageView, attribute: .height, relatedBy: .equal,
toItem: nil, attribute: .height,
multiplier: 1.0, constant: (screenWidth/4) * Constants.IMAGE_ASPECT_RATIO),
])
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
这里是我的ViewController代码相关部分：
import UIKit
import Alamofire
import AlamofireImage
import MBProgressHUD
import DBAlertController
class WishListsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var tableView: UITableView = UITableView()
var screenSize: CGRect!
var screenWidth: CGFloat!
var screenHeight: CGFloat!
var cellId = "WishListsCell"
var didSelectItem:Bool = false
override func viewDidLoad() {
super.viewDidLoad()
screenSize = UIScreen.main.bounds
screenWidth = screenSize.width
screenHeight = screenSize.height
tableView.delegate = self
tableView.dataSource = self
tableView.backgroundColor = .white
tableView.register(WishListsCell.self, forCellReuseIdentifier: cellId)
self.view.addSubview(tableView)
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
let customView = UIView(frame: CGRect(x:0, y:0, width:screenWidth, height:30))
customView.backgroundColor = Constants.APP_BACKGROUND_COLOR
let button = UIButton(frame: CGRect(x: 0, y: 0, width: screenWidth, height: 30))
button.setTitle("Add New Wish List", for: .normal)
button.setTitleColor(Constants.APP_TEXT_COLOR, for: .normal)
button.titleLabel?.font = Constants.APP_HEADER_FONT
button.addTarget(self, action: #selector(addButtonAction), for: .touchUpInside)
customView.addSubview(button)
tableView.tableHeaderView = customView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return wishLists.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 120
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! WishListsCell
let listId = wishLists[indexPath.section]["listid"] as! Int
cell.alamofireRequest?.cancel()
cell.alamofireRequest = Alamofire.request(myURL)
.responseJSON(completionHandler: {
response in
self.parseWishListItemData(JSONData: response.data!)
})
return cell
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let listName = wishLists[section]["listname"] as! String
return listName
}
}
只是一个猜测，但不应该将集合视图的代表是在您添加集合视图协议视图控制器设置？并设置数据源并在那里委托？我看到你已经添加了一个扩展，尽管可能不是。 –
我正在关注几个这样做的博客，https://contentpedlar.wordpress.com/2016/10/22/uicollectionview-in-uitableview/ – markhorrocks
也许是因为您正在主线程上进行Web请求，阻止了用户界面及其集合视图的更新，因此为什么你没有得到函数调用。如果你评论你的Alamofire代码会发生什么。 –