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我有一個表視圖單元格內的集合視圖。該模型是按願望清單名稱分組的願望清單項目。可能有許多願望清單。當用戶選擇願望清單時，他們會得到一系列希望清單，但我希望在單元中顯示願望清單的項目圖像預覽。它們不是單獨選擇的，單元格選擇將轉到選定願望清單的項目列表。同樣，我會用滑動刪除動作刪除整個願望清單。UITableViewCell中的Swift UICollectionView無法正常工作
這裏我的問題是，collectionView函數根本不會觸發。我正在測試的源數據有一個願望清單和4個項目。
這是我的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
}
}
這裏是我的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")
}
}
這裏是我的ViewController代碼相關部分：
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
}
}
只是一個猜測，但不應該將集合視圖的代表是在您添加集合視圖協議視圖控制器設置？並設置數據源並在那裏委託？我看到你已經添加了一個擴展，儘管可能不是。 –
我正在關注幾個這樣做的博客，https://contentpedlar.wordpress.com/2016/10/22/uicollectionview-in-uitableview/ – markhorrocks
也許是因爲您正在主線程上進行Web請求，阻止了用戶界面及其集合視圖的更新，因此爲什麼你沒有得到函數調用。如果你評論你的Alamofire代碼會發生什麼。 –