Question

在遵循有关如何在tableViewCell (here)中添加collectionViews的指南之后，我试着看看是否可以切换这两个单元格。但是，当我尝试向下滚动集合视图（水平）时，我收到一个错误，即collectionview索引超出范围。我试图看看为每个集合视图添加重新加载数据是否有助于解决这个问题，但它没有...代码如下：

class BuildTravelPackage: UIViewController, UITableViewDataSource,UITableViewDelegate, UICollectionViewDelegate {

@IBOutlet var optionsTableView: UITableView!

var items = [[PackageOption]]()

override func viewDidLoad() {
    super.viewDidLoad()

    let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(self.longPress(longPressGestureRecognizer:)))
    self.optionsTableView.addGestureRecognizer(longPressRecognizer)

    //load data into cells



}

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    cell.alpha = 0
    UIView.animate(withDuration: 1.0) { 
        cell.alpha = 1.0
    }
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 175
}

func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
    return true
}

func tableView(_ tableView: UITableView, shouldIndentWhileEditingRowAt indexPath: IndexPath) -> Bool {
    return false
}

func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
    return .none
}

func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
    let item = items[sourceIndexPath.row]
    items.remove(at: sourceIndexPath.row)
    items.insert(item, at: destinationIndexPath.row)
    optionsTableView.isEditing = !optionsTableView.isEditing

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = optionsTableView.dequeueReusableCell(withIdentifier: "optionCell", for: indexPath) as! PackageOptionTableViewCell
    cell.collectionView.delegate = self
    cell.collectionView.dataSource = self
    cell.collectionView.tag = indexPath.row
    cell.collectionView.reloadData()
    return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return items.count
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    print("Column:",indexPath.row)
    print("Row:",collectionView.tag)
    //highlght selected cell and load a new cell with infomation? Or load a uiview with date selection
}

func longPress(longPressGestureRecognizer: UILongPressGestureRecognizer) {

    if longPressGestureRecognizer.state == UIGestureRecognizerState.began {

        let touchPoint = longPressGestureRecognizer.location(in: self.view)
        if let indexPath = optionsTableView.indexPathForRow(at: touchPoint) {
            optionsTableView.isEditing = !optionsTableView.isEditing

        }
    }
}
}


extension BuildTravelPackage:UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return items[collectionView.tag].count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "singleOptionCell", for: indexPath) as! OptionCollectionViewCell
    cell.image.image = items[collectionView.tag][indexPath.row].imageFile
    cell.label.text = items[collectionView.tag][indexPath.row].name
    return cell
}

}

Answer 1

我认为当你替换对象时问题就在这里

func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
let item = items[sourceIndexPath.row]
items.remove(at: sourceIndexPath.row)
items.insert(item, at: destinationIndexPath.row)
optionsTableView.isEditing = !optionsTableView.isEditing
}

尝试用

代替代码

 swap(& items[sourceIndexPath.row], & items[destinationIndexPath.row])

移动索引路径后，在UITableviewCell内部的UICollectionView

1 个答案: