我知道问题已经解决了很多次，但是没有一种方法可以帮助我。
我想在tableView中插入新行。我有三个部分，在第二和第三部分中，我有UIButton可以将新行推断为所需部分，但是在控制台中收到错误消息。可能是什么问题？
我在插入新行时遇到的错误-attempt to insert row 2 into section 1, but there are only 2 rows in section 1 after the update
我的代码：
class SettingsScheduleAndPricesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var saveBarButtonItem: UIBarButtonItem!
@IBOutlet weak var backBarButtonItem: UIBarButtonItem!
let sectionTitle = ["Day of week", "Second section", "Third section"]
var secondRowText = ["First row", "Second row"]
var thirdRowText = ["Row one", "Row two", "Row three"]
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - TableView
func numberOfSections(in tableView: UITableView) -> Int {
return sectionTitle.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
switch section {
case 0: return 1
case 1: return 2
default: return 3
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.section == 0 {
let collectionCell = tableView.dequeueReusableCell(withIdentifier: "collectionCell", for: indexPath) as! SettingsCollectionViewCell
return collectionCell
} else if indexPath.section == 1 {
let hourlyRateCell = tableView.dequeueReusableCell(withIdentifier: "hourlyRateCell", for: indexPath) as! SettingsHourlyRateCell
hourlyRateCell.textLabel?.text = secondRowText[indexPath.row]
return hourlyRateCell
} else {
let datePriceCell = tableView.dequeueReusableCell(withIdentifier: "datePriceCell", for: indexPath) as! SettingsDatePriceCell
datePriceCell.textLabel?.text = thirdRowText[indexPath.row]
return datePriceCell
}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return self.sectionTitle[section]
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let frame: CGRect = tableView.frame
if section == 0 {
let headerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height))
headerView.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
return headerView
} else if section == 1 {
let addButton: UIButton = UIButton(frame: CGRect(x: frame.size.width - 50, y: 0, width: 50, height: 30))
addButton.backgroundColor = UIColor.clear
addButton.setTitleColor(#colorLiteral(red: 0.2588235438, green: 0.7568627596, blue: 0.9686274529, alpha: 1), for: .normal)
addButton.setTitle("Add", for: .normal)
addButton.addTarget(self, action: #selector(SettingsScheduleAndPricesViewController.addHourlyRate(sender:)), for: .touchUpInside)
let headerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height))
headerView.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
headerView.addSubview(addButton)
return headerView
} else {
let addButton: UIButton = UIButton(frame: CGRect(x: frame.size.width - 50, y: 0, width: 50, height: 30))
addButton.backgroundColor = UIColor.clear
addButton.setTitleColor(#colorLiteral(red: 0.2588235438, green: 0.7568627596, blue: 0.9686274529, alpha: 1), for: .normal)
addButton.setTitle("Add", for: .normal)
addButton.addTarget(self, action: #selector(SettingsScheduleAndPricesViewController.addDatePrice(sender:)), for: .touchUpInside)
let headerView: UIView = UIView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height))
headerView.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
headerView.addSubview(addButton)
return headerView
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 30
}
@objc func addHourlyRate(sender: UIButton) {
let newRow: String = "Third row"
secondRowText.append(newRow)
let indexPath = IndexPath(row: secondRowText.count - 1, section: 1)
tableView.beginUpdates()
tableView.insertRows(at: [indexPath], with: .automatic)
tableView.endUpdates()
}
@objc func addDatePrice(sender: UIButton) {
let newRow: String = "Row four"
thirdRowText.append(newRow)
let indexPath = IndexPath(row: thirdRowText.count - 1, section: 2)
tableView.beginUpdates()
tableView.insertRows(at: [indexPath], with: .automatic)
tableView.endUpdates()
}
}
delegate中添加的 dataSource和storyboard
请不要因为重复这个问题而责骂，所有发现的答案都对我没有帮助
答案 0 :(得分：2)
强烈建议不要硬编码numberOfSections和numberOfRowsInSection的返回值。这导致了错误。
另一方面，强烈建议您使用自定义结构作为数据模型。这样效率更高，并且可以避免那些错误。
struct Section {
let title : String
var rows : [String]
}
class SettingsScheduleAndPricesViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var saveBarButtonItem: UIBarButtonItem!
@IBOutlet weak var backBarButtonItem: UIBarButtonItem!
var sections = [Section]()
override func viewDidLoad() {
super.viewDidLoad()
sections = [Section(title: "Day of week", rows: []),
Section(title: "Second section", rows: ["First row", "Second row"]),
Section(title: "Day of week", rows: ["Row one", "Row two", "Row three"])]
}
// MARK: - TableView
func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].rows.count
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return sections[section].title
}
/*
`cellForRowAt`, `viewForHeaderInSection` and `heightForHeaderInSection` omitted
*/
@objc func addHourlyRate(sender: UIButton) {
let newRow = "Third row"
append(row: newRow, in: 1)
}
@objc func addDatePrice(sender: UIButton) {
let newRow = "Row four"
append(row: newRow, in: 2)
}
func append(row : String, in section: Int) {
let insertionIndex = sections[section].rows.count
sections[section].rows.append(row)
let indexPath = IndexPath(row: insertionIndex, section: section)
tableView.insertRows(at: [indexPath], with: .automatic)
}
}