仿iOS待办提醒APP的UITableView文本输入实现技术求助

Hey there! Let's work through your three issues step by step to replicate that smooth native iOS task/reminder input experience.

1. Add a New Cell When the User Presses Enter #

Since you're using UITextView (not UITextField as shown in your existing code), we'll use the UITextViewDelegate method to listen for the enter key. Replace your current textFieldShouldReturn with this implementation:

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    // Catch the enter key press
    guard text == "\n" else { return true }
    
    // Get the current cell and its index path
    guard let cell = textView.superview?.superview as? tvcAddMetaDetails,
          let indexPath = tvAddMetaDetails.indexPath(for: cell) else {
        return false
    }
    
    let dataCount = isIngredients ? listItems.count : Method.count
    // Only add a new row if we're in an editable data row (not the "+" row)
    if indexPath.row < dataCount {
        // Save the current text (strip the newline)
        let updatedText = (textView.text as NSString).replacingCharacters(in: range, with: text).trimmingCharacters(in: .newlines)
        if isIngredients {
            listItems[indexPath.row] = updatedText
        } else {
            Method[indexPath.row] = updatedText
        }
        
        // Add an empty entry to the data source for the new row
        isIngredients ? listItems.append("") : Method.append("")
        
        // Refresh the table
        tvAddMetaDetails.reloadData()
        
        // Scroll to the new row and focus its text view
        DispatchQueue.main.async {
            let newIndexPath = IndexPath(row: dataCount, section: 0)
            self.tvAddMetaDetails.scrollToRow(at: newIndexPath, at: .bottom, animated: true)
            if let newCell = self.tvAddMetaDetails.cellForRow(at: newIndexPath) as? tvcAddMetaDetails {
                newCell.textView.becomeFirstResponder()
            }
        }
    }
    
    // Prevent the newline from appearing in the text view
    return false
}

Make sure your tvcAddMetaDetails cell has a textView property, and you've set the view controller as its delegate in cellForRowAt.

2. Remove Hardcoded Number of Rows #

Instead of hardcoding a row count, base it on your data source plus one extra row for the "+" add button. Update your numberOfRowsInSection method:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // Actual data entries + 1 row for the add button
    let dataCount = isIngredients ? listItems.count : Method.count
    return dataCount + 1
}

This way, the table will always show exactly your existing entries plus the add row—no hardcoding required.

3. Add a "+" Button for the New Row #

First, make sure your tvcAddMetaDetails cell has a UIButton (we'll call it addButton) added to its layout. Then modify your cellForRowAt method to differentiate between data rows and the add row:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "AddMetaDetails", for: indexPath) as! tvcAddMetaDetails
    
    let dataCount = isIngredients ? listItems.count : Method.count
    
    if indexPath.row < dataCount {
        // Configure editable text view row
        cell.textView.isHidden = false
        cell.addButton.isHidden = true
        cell.textView.text = isIngredients ? listItems[indexPath.row] : Method[indexPath.row]
        cell.textView.delegate = self // Set delegate for text input handling
        // Keep your existing numbering if needed:
        // cell.textLabel?.text = "\(indexPath.row + 1). \(cell.textView.text ?? "")"
    } else {
        // Configure add button row
        cell.textView.isHidden = true
        cell.addButton.isHidden = false
        cell.addButton.setTitle("+", for: .normal)
        cell.addButton.titleLabel?.font = UIFont.systemFont(ofSize: 24, weight: .medium)
        // Add tap action for the button
        cell.addButton.addTarget(self, action: #selector(addNewRowTapped), for: .touchUpInside)
    }
    
    return cell
}

// Action for the "+" button tap
@objc private func addNewRowTapped() {
    // Add empty entry to data source
    isIngredients ? listItems.append("") : Method.append("")
    tvAddMetaDetails.reloadData()
    
    // Scroll to the new row and focus its text view
    let newRowIndex = (isIngredients ? listItems.count : Method.count) - 1
    let newIndexPath = IndexPath(row: newRowIndex, section: 0)
    tvAddMetaDetails.scrollToRow(at: newIndexPath, at: .bottom, animated: true)
    
    DispatchQueue.main.async {
        if let newCell = self.tvAddMetaDetails.cellForRow(at: newIndexPath) as? tvcAddMetaDetails {
            newCell.textView.becomeFirstResponder()
        }
    }
}

Note: Adjust your cell's layout to center the addButton and match the clean, native iOS style.

Quick Additional Notes #

• Keep your existing heightForRowAt setup (automatic dimension) to maintain dynamic cell heights as the user types.
• Ensure your tvcAddMetaDetails cell's textView has isScrollEnabled = false (you mentioned you already have this covered).

内容的提问来源于stack exchange，提问作者captain_haddock