swift - UICollection View 与 TableView 错误索引超出范围为什么

Question

我有字典数组[String:[String]]，我想在 TableView 中显示 Collection View ，但是当加载数据时，它会给出错误，指出索引在collectionView的cellForItem中超出范围。这是我的 UIViewController 的完整源代码

    import UIKit
     struct Objects {
    var sectionName : String!
    var sectionObjects : [String]!
    } class TableViewController: UITableViewController {
    var TestArray = ["Hair": ["1","2","3"],"Nail": ["1","2"],"Makeup":["1","2","3","4"]]
     var Sections:[String] = []
     var objectArray = [Objects]()
    var section = 0
    var nameTest:String = ""
    override func viewDidLoad() {
    super.viewDidLoad()
    for (name, path) in TestArray {
       // print("The path to '\(name)' is '\(path)'.")
        var nameTest = name as? String
       // print("value count \(TestArray[name]?.count)")
        Sections.append(nameTest!)
    }
    for (key, value) in TestArray {
        objectArray.append(Objects(sectionName: key, sectionObjects: value))
    }
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    print("Table View Number of Secltions \(objectArray.count)")
    return objectArray.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 1
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return objectArray[section].sectionName
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Test", for: indexPath) as? TableViewCell
    // Configure the cell...
section = indexPath.section //cell!.textLabel?.text = objectArray[indexPath.section].sectionObjects[indexPath.row] cell?.TestCollectionView.delegate = self cell?.TestCollectionView.dataSource = self cell?.TestCollectionView.reloadData()
    return cell!
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 160
}
} extension TableViewController:UICollectionViewDelegate,UICollectionViewDataSource { func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { print("Collection View Number Of Item in Section (objectArray[section].sectionObjects.count)") return objectArray[section].sectionObjects.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CCell", for: indexPath) as? CollectionViewCell
    cell?.Name.text = objectArray[section].sectionObjects[indexPath.row] // here index out of range 
    return cell!
}
}

Answer 1

您使用了错误的方法，全局初始化部分，并在 cellForRow 中分配其值，因为 cellForRow 被多次调用，其值根据当前显示的单元格而变化。我在代码中做了一些更改，请检查。

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Test", for: indexPath) as? TableViewCell

// Configure the cell...

 section = indexPath.section // remove this line
 cell?.TestCollectionView.tag = indexPath.section // add this line
  //cell!.textLabel?.text = objectArray[indexPath.section].sectionObjects[indexPath.row] 
cell?.TestCollectionView.delegate = self 
cell?.TestCollectionView.dataSource = self 
cell?.TestCollectionView.reloadData()

return cell!
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CCell", for: indexPath) as? CollectionViewCell
cell?.Name.text = objectArray[section].sectionObjects[indexPath.row] // remove this line
cell?.Name.text = objectArray[collectionView.tag].sectionObjects[indexPath.row]// add this line
return cell!
}

更新

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