如何传递数据并向TableView添加行且保留旧行？添加行被覆盖求助

Hey, let's figure out why your TableView only holds the latest entry—it’s almost certainly a data source management issue. Here’s the breakdown of what’s probably going wrong and how to fix it:

1. You’re Reinitializing the Data Array Instead of Appending to It #

The biggest culprit here is likely that every time you save new data from the popup, you’re creating a brand new array instead of adding the new item to your existing one.

For example, if you’re doing this in your save callback:

// ❌ Wrong: Replaces the entire array with just the new item
var items = [LinkItem]()
items = [newItem]

You’ll only ever have one entry in the array. Instead, declare your data array as a class-level property in your TableViewController so it persists across saves, then append new items to it:

// ✅ Correct: Declare the array as a persistent property
class YourTableViewController: UITableViewController {
    // Match this data model to your setup
    struct LinkItem {
        let name: String
        let link: String
    }
    
    // This array stores all your entries long-term
    private var savedItems = [LinkItem]()
    
    // ... rest of your TableVC code
}

2. Append New Data Instead of Replacing the Array #

When you receive the name and link from your popup, make sure you add the new item to your existing array—not replace the whole thing:

// Example callback for your popup's save button
popupViewController.onSave = { [weak self] name, link in
    guard let self = self, !name.isEmpty, !link.isEmpty else { return }
    
    let newItem = LinkItem(name: name, link: link)
    
    // ✅ Append to the existing array (don't replace it)
    self.savedItems.append(newItem)
    
    // Refresh the TableView to show the new row
    self.tableView.reloadData()
}

If you were using savedItems = [newItem] before, that’s exactly why old entries kept getting overwritten—this line replaces the entire array with just the new item.

3. Tie TableView Row Count to Your Array’s Length #

Double-check your TableView data source methods to ensure you’re returning the actual length of your array, not a fixed number:

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // ✅ Return the count of your data array, not a hardcoded 1
    return savedItems.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "YourCellID", for: indexPath)
    let item = savedItems[indexPath.row]
    
    // Populate cell with your data
    cell.textLabel?.text = item.name
    cell.detailTextLabel?.text = item.link
    
    return cell
}

If you had return 1 hardcoded here, your TableView would only ever show one row, no matter how many items are in your array.

Quick Recap #

• Keep your data array as a persistent class property (don’t reinitialize it every time you save)
• Append new items to the array instead of replacing the entire array
• Make sure your TableView’s row count uses the array’s actual length

That should fix the issue and let you add as many rows as you want!

内容的提问来源于stack exchange，提问作者Ahmed