我正在构建一个自定义界面，供用户在我的应用中输入首选项设置。我在example I found at AppCoda之后使用可扩展行。我重写了这个例子，使用Swift 3/4并使用代码中的单元格信息，而不是从plist中读取。
我对屏幕上出现某些细胞内容的方式有疑问。展开和折叠的行包含允许用户输入的文本字段。下面的示例代码中有四行。
当在其中一个单元格中输入条目时，它可能会也可能不会导致最后输入的值在展开时显示在所有四个单元格中。 “额外”文本甚至会覆盖属于那里的信息。
我已经尝试了所有我能想到的东西来摆脱这个令人讨厌的文字，但我正在撞墙。我错过了什么？
FWIW，我现在正在寻找其他地方的类似解决方案。这是我非常喜欢的一个：
https://github.com/jeantimex/ios-swift-collapsible-table-section-in-grouped-section
这个看起来很有趣但不在Swift中：
https://github.com/singhson/Expandable-Collapsable-TableView
相同评论：
https://github.com/OliverLetterer/SLExpandableTableView
这看起来非常有趣 - 得到很好的支持 - 但我没有时间调查：
https://github.com/Augustyniak/RATreeView
此处有类似的请求：
Expand cell when tapped in Swift
此处描述了类似的问题，但我认为我已经在做什么了？
http://www.thomashanning.com/the-most-common-mistake-in-using-uitableview/
这是我的表视图控制器代码。我相信问题出现在...中。
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
}
以下是CustomCell代码，我几乎没有任何更改：
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
}
}
答案 0 :(得分：0)
override func prepareForReuse() {
super.prepareForReuse()
textLabel?.text = nil
detailTextLabel?.text = nil
textField?.placeholder = nil
}
你能看到缺少的东西吗？
textField?.text = nil
这就是全部！我正在讨论标签而不是文本字段本身。