【发布时间】:2017-12-05 23:55:56
【问题描述】:
我正在构建一个自定义界面,供用户在我的应用中输入偏好设置。我正在使用example I found at AppCoda 之后的可扩展行。我已经修改了该示例以使用 Swift 3/4 并使用代码中的单元格信息,而不是从 plist 中读取。
我对某些单元格内容在屏幕上的显示方式有疑问。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这样的行。
当在其中一个单元格中输入条目时,它可能会或可能不会导致最后输入的值在所有四个单元格中出现。 “额外”文本甚至会覆盖属于那里的信息。
我已经尝试了我能想到的一切来删除这个冒犯性的文字,但我的头撞到了墙上。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,但不是在 Swift 中:
https://github.com/singhson/Expandable-Collapsable-TableView
同样的评论:
https://github.com/OliverLetterer/SLExpandableTableView
这看起来很有趣 - 得到很好的支持 - 但我没有时间调查:
https://github.com/Augustyniak/RATreeView
这里有一个类似的请求:
Expand cell when tapped in Swift
这里描述了一个类似的问题,但我想我已经按照建议的做了?
http://www.thomashanning.com/the-most-common-mistake-in-using-uitableview/
这是我的表格视图控制器代码。我相信问题出在...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath):
...函数,但我一辈子都看不到它。
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
}
这是我几乎没有更改的 CustomCell 代码:
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
}
}
【问题讨论】:
标签: swift uitableview cell expandable