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我正在为用户构建自定义界面，以在我的应用中输入偏好设置。我正在使用example I found at AppCoda之后的展开式行。我重写了这个例子来使用Swift 3/4，并使用代码中的单元信息而不是从plist中读取。Swift表中的可扩展单元 - 单元重用/出队？
我遇到了一些单元格内容出现在屏幕上的问题。展开和折叠的行包含文本字段以允许用户输入。下面的示例代码中有四个这样的行。
在其中一个单元格中输入条目时，它们可能会或不会导致最后输入的值在展开时出现在所有四个单元格中。 '额外'文本甚至会覆盖那里的信息。
我试过了所有我能想到的东西来摆脱这种违规的文字，但我把头撞在墙上。我错过了什么？
FWIW，我现在正在其他地方寻找类似的解决方案。这里有一个我喜欢了不少：
https://github.com/jeantimex/ios-swift-collapsible-table-section-in-grouped-section
这一个看起来很有趣，但不是在斯威夫特：
https://github.com/singhson/Expandable-Collapsable-TableView
相同意见：
https://github.com/OliverLetterer/SLExpandableTableView
这看起来非常有趣 - 很好的支持 - 但我没有时间去调查：
https://github.com/Augustyniak/RATreeView
了类似的要求在这里：
Expand cell when tapped in Swift
这里描述的类似的问题，但我觉得我已经做了什么建议？
http://www.thomashanning.com/the-most-common-mistake-in-using-uitableview/
这里是我的表视图控制器代码。我相信问题在...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath):
...功能，但对于我的生活我看不到它。
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
test = defineCellProps() // This loads my hard-coded cell properties into array "test"
configureTableView()
}
func configureTableView() {
loadCellDescriptors()
tblExpandable.delegate = self
tblExpandable.dataSource = self
tblExpandable.tableFooterView = UIView(frame: CGRect.zero)
tblExpandable.register(UINib(nibName: "NormalCell", bundle: nil), forCellReuseIdentifier: "idCellNormal")
tblExpandable.register(UINib(nibName: "TextfieldCell", bundle: nil), forCellReuseIdentifier: "idCellTextfield") // There are additional cell types that are not shown and not related to the problem
}
func loadCellDescriptors() { // Puts the data from the "test" array into the format used in the original example
for section in 0..<ACsections.count {
var sectionProps = findDict(matchSection: ACsections[section], dictArray: test)
cellDescriptors.append(sectionProps)
}
cellDescriptors.remove(at: 0) // Removes the empty row
getIndicesOfVisibleRows()
tblExpandable.reloadData() // The table
}
func getIndicesOfVisibleRows() {
visibleRowsPerSection.removeAll()
for currentSectionCells in cellDescriptors { // cellDescriptors is an array of sections, each containing an array of cell dictionaries
var visibleRows = [Int]()
let rowCount = (currentSectionCells as AnyObject).count as! Int
for row in 0..<rowCount { // Each row is a table section, and array of cell dictionaries
var testDict = currentSectionCells[row]
if testDict["isVisible"] as! Bool == true {
visibleRows.append(row)
} // Close the IF
} // Close row loop
visibleRowsPerSection.append(visibleRows)
} // Close section loop
} // end the func
func getCellDescriptorForIndexPath(_ indexPath: IndexPath) -> [String: AnyObject] {
let indexOfVisibleRow = visibleRowsPerSection[indexPath.section][indexPath.row]
let cellDescriptor = (cellDescriptors[indexPath.section])[indexOfVisibleRow]
return cellDescriptor as [String : AnyObject]
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let currentCellDescriptor = getCellDescriptorForIndexPath(indexPath)
let cell = tableView.dequeueReusableCell(withIdentifier: currentCellDescriptor["cellIdentifier"] as! String, for: indexPath) as! CustomCell
cell.textLabel?.text = nil
cell.detailTextLabel?.text = nil
cell.textField?.placeholder = nil
if currentCellDescriptor["cellIdentifier"] as! String == "idCellNormal" {
if let primaryTitle = currentCellDescriptor["primaryTitle"] {
cell.textLabel?.text = primaryTitle as? String
}
if let secondaryTitle = currentCellDescriptor["secondaryTitle"] {
cell.detailTextLabel?.text = secondaryTitle as? String
}
}
else if currentCellDescriptor["cellIdentifier"] as! String == "idCellTextfield" {
if let primaryTitle = currentCellDescriptor["primaryTitle"] {
if primaryTitle as! String == "" {
cell.textField.placeholder = currentCellDescriptor["secondaryTitle"] as? String
cell.textLabel?.text = nil
} else {
cell.textField.placeholder = nil
cell.textLabel?.text = primaryTitle as? String
}
}
if let secondaryTitle = currentCellDescriptor["secondaryTitle"] {
cell.detailTextLabel?.text = "some text"
}
cell.detailTextLabel?.text = "some text"
// This next line, when enabled, always puts the correct row number into each cell.
// cell.textLabel?.text = "cell number \(indexPath.row)."
}
cell.delegate = self
return cell
}
这里是CustomCell代码几乎没有变化由我：
import UIKit
protocol CustomCellDelegate {
func textfieldTextWasChanged(_ newText: String, parentCell: CustomCell)
}
class CustomCell: UITableViewCell, UITextFieldDelegate {
@IBOutlet weak var textField: UITextField!
let bigFont = UIFont(name: "Avenir-Book", size: 17.0)
let smallFont = UIFont(name: "Avenir-Light", size: 17.0)
let primaryColor = UIColor.black
let secondaryColor = UIColor.lightGray
var delegate: CustomCellDelegate!
override func awakeFromNib() {
super.awakeFromNib() // Initialization code
if textLabel != nil {
textLabel?.font = bigFont
textLabel?.textColor = primaryColor
}
if detailTextLabel != nil {
detailTextLabel?.font = smallFont
detailTextLabel?.textColor = secondaryColor
}
if textField != nil {
textField.font = bigFont
textField.delegate = self
}
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
override func prepareForReuse() { // I added this and it did not help
super.prepareForReuse()
textLabel?.text = nil
detailTextLabel?.text = nil
textField?.placeholder = nil
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if delegate != nil {
delegate.textfieldTextWasChanged(textField.text!, parentCell: self)
}
return true
}
}