如何将 2 组数据组合成一个 UITableview

Question

我想知道如何将 2 组数据合并为一个 table 视图

    var myFirstData = ["Hello", "Hi"]
    var mySecondData = ["Goodbye", "Bye"]

对于 cellForRowAt、numberOfRowsInSection 和 trailingSwipeActionsConfigurationForRowAt 我应该放什么来检测我使用的是哪个数组

如果可以，能给我一个示例项目吗

Answer 1

您应该始终为 table 视图使用一组数据。这使得跟踪变得容易，因为您可以 return 请求 indexPath.row 处的对象到数据源。

如果您有 2 个数据数组要显示，将它们合并为一个数组会容易得多...

var combinedData = myFirstData + mySecondData

...然后将组合数组输入 table 视图。您的原始数组将不受影响。

这是实施了 cellForRowAt、numberOfRowsInSection 和 trailingSwipeActionsConfigurationForRowAt 的示例。

class TableCell: UITableViewCell {
    @IBOutlet weak var label: UILabel!
}

class ViewController: UIViewController {

    var myFirstData = ["Hello", "Hi"]
    var mySecondData = ["Goodbye", "Bye"]
    var combinedData = [String]()
    
    @IBOutlet weak var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        combinedData = myFirstData + mySecondData /// set combinedData (will not affect myFirstData or mySecondData)
        tableView.dataSource = self
        tableView.delegate = self
    }
}

extension ViewController: UITableViewDelegate, UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return combinedData.count /// simply return the count of the entire combinedData array
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "TableCellIdentifier", for: indexPath) as! TableCell
        let textAtRow = combinedData[indexPath.row] /// also get what to display from combinedData
        cell.label.text = textAtRow
        return cell
    }
    
    func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        let textAtRow = combinedData[indexPath.row]
        
        let title = "Capitalize"
        
        let action = UIContextualAction(style: .normal, title: title, handler: { (_,_,_) in
            
            let uppercasedText = textAtRow.uppercased()
            
            /// Update data source when user taps action
            self.combinedData[indexPath.row] = uppercasedText
            
            /// if you want to modify the original arrays
            if let firstIndex = self.myFirstData.firstIndex(of: textAtRow) { /// get first index of text at this row, if exists
                self.myFirstData[firstIndex] = uppercasedText /// set the text to the new text
            }
            if let firstIndex = self.mySecondData.firstIndex(of: textAtRow) {
                self.mySecondData[firstIndex] = uppercasedText
                
            }
            
            self.tableView.reloadRows(at: [indexPath], with: .automatic)
            
            print("Combined: \(self.combinedData), myFirstData: \(self.myFirstData), mySecondData: \(self.mySecondData)")
        })
        
        action.image = UIImage(systemName: "textformat")
        action.backgroundColor = .blue
        let configuration = UISwipeActionsConfiguration(actions: [action])
        return configuration
    }
}

Repo on GitHub

如何将 2 组数据组合成一个 UITableview

How do I combine 2 sets of data into one UITableview

arrays

merge

uitableview

swift