CollectionView 在 tableViewCell 数据显示

Posted 2023-03-12

【中文标题】CollectionView 在 tableViewCell 数据显示

【英文标题】：CollectionView in tableViewCell data display

【发布时间】：2015-07-16 09:26:50

【问题描述】：

我在每个 tableViewCell 中嵌入了一个 collectionView。在每个 tableViewWillDisplayCell 事件中，我为我的 collectionView 设置了正确的 dataSource，然后在 collectionView 中重新加载数据。

代码如下：

override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) 
    let c = cell as! CustomTableViewCell
    c.setCollectionViewDataSourceDelegate(dataSourceDelegate: self, indexPath: indexPath)

CustomTableViewCell.swift：

class CustomTableViewCell: UITableViewCell 

var collectionView: indexedCollectionView!

override init(style: UITableViewCellStyle, reuseIdentifier: String?) 
    super.init(style: style, reuseIdentifier: reuseIdentifier)

    var layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.itemSize = CGSizeMake(5, 5)
    layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
    self.collectionView = indexedCollectionView(frame: CGRectZero, collectionViewLayout: layout)
    self.collectionView.registerClass(UICollectionViewCell.classForCoder(), forCellWithReuseIdentifier: collectionViewCellIdentifier as String)
    self.collectionView.backgroundColor = UIColor.whiteColor()
    self.collectionView.showsHorizontalScrollIndicator = false
    self.contentView.addSubview(self.collectionView)


required init(coder aDecoder: NSCoder) 
    super.init(coder: aDecoder)


override func layoutSubviews() 
    super.layoutSubviews()
    self.collectionView.frame = self.contentView.bounds;


func setCollectionViewDataSourceDelegate(dataSourceDelegate delegate: protocol<UICollectionViewDelegate,UICollectionViewDataSource>, indexPath: NSIndexPath)
    self.collectionView.dataSource = delegate
    self.collectionView.delegate = delegate
    self.collectionView.indexPath = indexPath
    self.collectionView.tag = indexPath.row
    self.collectionView.reloadData()

TableViewController.swift：

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
    let cell: UICollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionViewCell", forIndexPath: indexPath) as! UICollectionViewCell
    let tableViewCell = self.tableView.cellForRowAtIndexPath(NSIndexPath(forItem: collectionView.tag, inSection: 0))
    var rect: CGRect?

    var label: UILabel = UILabel()
    label.font = UIFont(name: "HelveticaNeue-Light", size: 18.0)
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.ByWordWrapping
    label.textAlignment = .Center
    switch indexPath.row 
    case 0:
        cell.frame = CGRectMake(0, 0, tableViewCell!.frame.width * 0.2, tableViewCell!.frame.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = events[collectionView.tag].category
        break
    case 1:
        cell.frame = CGRectMake(tableViewCell!.frame.width * 0.2, 0, tableViewCell!.frame.width * 0.3, tableViewCell!.frame.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = events[collectionView.tag].event
        break
    case 2:
        cell.frame = CGRectMake(tableViewCell!.frame.width * 0.5, 0, tableViewCell!.frame.width * 0.26, tableViewCell!.frame.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = events[collectionView.tag].location
        break
    case 3:
        cell.frame = CGRectMake(tableViewCell!.frame.width * 0.76, 0, tableViewCell!.frame.width * 0.12, tableViewCell!.frame.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = events[collectionView.tag].date
        break
    case 4:
        cell.frame = CGRectMake(tableViewCell!.frame.width * 0.88, 0, tableViewCell!.frame.width * 0.12, tableViewCell!.frame.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = events[collectionView.tag].time
        break
    default:
        break
    
    cell.addSubview(label)
    cell.layer.borderColor = UIColor.blackColor().CGColor
    cell.layer.borderWidth = 0.5

    return cell

当应用程序启动时，一切看起来都很好 (screenshot)，但是当我滚动我的 tableView 时，它变成为每个触发其 collectionView 的 reloadData 的单元格再次触发 tableView willDisplayCell 事件。

但效果不佳 (screenshot)。有人可以帮我解决我的问题吗？

更新：

我试图重新编写我的代码，但我遇到了问题。这是我的全部代码：

class TableViewController: UITableViewController //, UICollectionViewDataSource, UICollectionViewDelegate 

var events: [Event] = [
    Event(category: "GAA - Football Campionship", event: "Round 4A Munster Final Runner up v Round 3A Winner", location: "Semple Stadium - Thurles", date: "7/12/15", time: "2:00pm"),
    Event(category: "Football", event: "Round 4A Munster", location: "Thurles", date: "7/2/15", time: "All day"),
    Event(category: "Golf - 4 Majors", event: "U.S. Open Day 4 ( Final Day)", location: "Oakmont Country Club, Pennsylvania", date: "7/12/15", time: ""),
]

override func viewDidLoad() 
    super.viewDidLoad()

    //self.tableView.registerClass(CustomTableViewCell.self, forCellReuseIdentifier: "Cell")
    self.tableView.separatorStyle = .None
    self.tableView.tableFooterView = UIView(frame: CGRectZero)


// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int 
    return 1


override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    return events.count


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 
    var cell: CustomTableViewCell? = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as? CustomTableViewCell

    if cell == nil 
        cell = CustomTableViewCell.CreateCustomCell()
    
    cell!.event = events[indexPath.row]
    cell!.size = CGSize(width: cell!.frame.width, height: cell!.frame.height)
    cell!.collectionView.reloadData()
    cell!.clipsToBounds = true

    return cell!


//    override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) 
//        let c = cell as! CustomTableViewCell
//        c.setCollectionViewDataSourceDelegate(dataSourceDelegate: self, indexPath: indexPath)
//    

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat 
    var cellHeight: CGFloat = 0.0
    let screenWidth: CGFloat = UIScreen.mainScreen().bounds.width

    var question: NSString = events[indexPath.row].category
    var size = CGSizeMake(screenWidth * 0.2, 9999)
    var textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
    size = textRect.size
    cellHeight = size.height

    question = events[indexPath.row].event
    size = CGSizeMake(screenWidth * 0.3, 9999)
    textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
    size = textRect.size
    if cellHeight < size.height 
        cellHeight = size.height
    

    question = events[indexPath.row].location
    size = CGSizeMake(screenWidth * 0.3, 9999)
    textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
    size = textRect.size
    if cellHeight < size.height 
        cellHeight = size.height
    

    question = events[indexPath.row].date
    size = CGSizeMake(screenWidth * 0.1, 9999)
    textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
    size = textRect.size
    if cellHeight < size.height 
        cellHeight = size.height
    

    question = events[indexPath.row].time
    size = CGSizeMake(screenWidth * 0.1, 9999)
    textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
    size = textRect.size
    if cellHeight < size.height 
        cellHeight = size.height
    

    return cellHeight

CustomTableViewCell.swift：

class CustomTableViewCell: UITableViewCell, UICollectionViewDataSource, UICollectionViewDelegate 

//var collectionView: UICollectionView!
@IBOutlet weak var collectionView: UICollectionView!

var event: Event?
var size: CGSize?

override func awakeFromNib() 
    super.awakeFromNib()
    println("awake")

    var layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
    layout.itemSize = CGSizeMake(5, 5)
    layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
    collectionView.collectionViewLayout = layout
    //self.collectionView = indexedCollectionView(frame: CGRectZero, collectionViewLayout: layout)
    collectionView.registerClass(CustomCollectionViewCell.self, forCellWithReuseIdentifier: "CollectionViewCell")
    collectionView.backgroundColor = UIColor.whiteColor()
    collectionView.showsHorizontalScrollIndicator = false
    var cNib:UINib? = UINib(nibName: "CustomCollectionViewCell", bundle: nil)
    collectionView.registerNib(cNib, forCellWithReuseIdentifier: "CollectionViewCell")
    collectionView.frame = self.bounds
    //self.contentView.addSubview(self.collectionView)



override init(style: UITableViewCellStyle, reuseIdentifier: String?) 
    super.init(style: style, reuseIdentifier: reuseIdentifier)

//        var layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
//        layout.sectionInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
//        layout.itemSize = CGSizeMake(5, 5)
//        layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
//        self.collectionView = indexedCollectionView(frame: CGRectZero, collectionViewLayout: layout)
//        self.collectionView.registerClass(UICollectionViewCell.classForCoder(), forCellWithReuseIdentifier: collectionViewCellIdentifier as String)
//        self.collectionView.backgroundColor = UIColor.whiteColor()
//        self.collectionView.showsHorizontalScrollIndicator = false
//        self.contentView.addSubview(self.collectionView)


required init(coder aDecoder: NSCoder) 
    super.init(coder: aDecoder)


//    override func layoutSubviews() 
//        super.layoutSubviews()
//        self.collectionView.frame = self.contentView.bounds;
//    

//    func setCollectionViewDataSourceDelegate(dataSourceDelegate delegate: protocol<UICollectionViewDelegate,UICollectionViewDataSource>, indexPath: NSIndexPath)
//        self.collectionView.dataSource = delegate
//        self.collectionView.delegate = delegate
//        self.collectionView.indexPath = indexPath
//        self.collectionView.tag = indexPath.row
//        self.collectionView.reloadData()
//    

// MARK: - Collection view data source

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int 
    return 1


func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    return 5


func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell 
    let cell: CustomCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionViewCell", forIndexPath: indexPath) as! CustomCollectionViewCell
    //let tableViewCell = tableView!.cellForRowAtIndexPath(NSIndexPath(forItem: collectionView.tag, inSection: 0))
    var rect: CGRect?

    var label: UILabel = UILabel()
    label.font = UIFont(name: "HelveticaNeue-Light", size: 18.0)
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.ByWordWrapping
    label.textAlignment = .Center
    switch indexPath.row 
    case 0:
        cell.frame = CGRectMake(0, 0, size!.width * 0.2, size!.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = event!.category
        break
    case 1:
        cell.frame = CGRectMake(size!.width * 0.2, 0, size!.width * 0.3, size!.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = event!.event
        break
    case 2:
        cell.frame = CGRectMake(size!.width * 0.5, 0, size!.width * 0.26, size!.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = event!.location
        break
    case 3:
        cell.frame = CGRectMake(size!.width * 0.76, 0, size!.width * 0.12, size!.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = event!.date
        break
    case 4:
        cell.frame = CGRectMake(size!.width * 0.88, 0, size!.width * 0.12, size!.height)
        rect = cell.bounds
        label.frame = rect!
        label.text = event!.time
        break
    default:
        break
    
    cell.addSubview(label)
    cell.layer.borderColor = UIColor.blackColor().CGColor
    cell.layer.borderWidth = 0.5

    return cell


class func CreateCustomCell() -> CustomTableViewCell

    var nibElements: Array = NSBundle.mainBundle().loadNibNamed("CustomTableViewCell", owner: self, options: nil)
    var item: AnyObject?
    for item in nibElements
    
        if item is UITableViewCell
        
            return item as! CustomTableViewCell
        
    
    return item as! CustomTableViewCell

CustomCollectionViewCell.swift

class CustomCollectionViewCell: UICollectionViewCell 

override init(frame: CGRect) 
    super.init(frame: frame)



required init(coder aDecoder: NSCoder) 
    super.init(coder: aDecoder)


override func awakeFromNib() 
    super.awakeFromNib()

另外，在情节提要中，我向 tableViewCell 添加了一个collectionView，将其连接到出口变量，并将CustomCollectionCell 类设置为情节提要中的collectionCell。

但是当我启动应用程序时，它在 tableViewCellForRowAtIndexPath 中的这一行引发了异常：

2015-07-16 13:29:00.965 CollectionViewInTableViewCell[4241:1005396] 由于未捕获的异常 NSUnknownKeyException 而终止应用程序，原因：[CollectionViewInTableViewCell.CustomTableViewCell 0x126e12440 setValue:forUndefinedKey:]：此类不符合键值编码密钥集合。'

【问题讨论】：

查看我的答案 听到***.com/questions/30159099/…

如何将数据从控制器传递到 customTableViewCell 以将数据输入到 collectionViewCells？

只需将数据属性添加到您的自定义单元格并在控制器中设置它（cellForRowAtIndexPath）。

好的，我会试着告诉你是否有问题。

@mikle94 请参阅cellForAtIndexPath 方法中的示例代码，我将数据传递给单元格，并且在单元格中它将被集合视图使用，例如cell?.folderCount = cardCountArray[indexPath.section]

【参考方案1】：

您的CustomTableViewCell 必须实现UICollectionViewDelegate 和UICollectionViewDataSource，并且在将其添加到表格视图时，单元格本身必须链接到委托和数据源。