我有一个UITableView
从带有标签的字典中填充。用户可以将标签从ViewController添加到另一个ViewController。
每个标签都有一个属性remoteID
。当用户按下+
按钮添加标签时,所选标签的按钮颜色将变为-
。
到目前为止一切都很好。问题是当我从MainViewController返回至TagsViewController时,按钮的状态未保存。现在,所有标签按钮都显示+
。
您能帮我保存按钮的状态(标题)吗?
在这里,我创建了一个小型项目,内容为:https://github.com/tygruletz/AppendTagsToCells
这是我的代码:
class Tag{
var remoteID: Int
var categoryID: Int
var name: String
var color: String
init(remoteID: Int, categoryID: Int, name: String, color: String) {
self.remoteID = remoteID
self.categoryID = categoryID
self.name = name
self.color = color
}
}
MainVC:
class ChecklistVC: UIViewController {
@IBOutlet weak var questionsTableView: UITableView!
//Properties
lazy var itemSections: [ChecklistItemSection] = {
return ChecklistItemSection.checklistItemSections()
}()
var lastIndexPath: IndexPath!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
questionsTableView.reloadData()
}
}
extension ChecklistVC: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let itemCategory = itemSections[section]
return itemCategory.checklistItems.count
}
func numberOfSections(in tableView: UITableView) -> Int {
return itemSections.count
}
// Set the header of each section
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let checklistItemCategory = itemSections[section]
return checklistItemCategory.name.uppercased()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "checklistCell", for: indexPath) as! ChecklistCell
let itemCategory = itemSections[indexPath.section]
let item = itemCategory.checklistItems[indexPath.row]
cell.delegate = self
cell.configCell(item)
cell.vehicleCommentLabel.text = item.vehicleComment
cell.trailerCommentLabel.text = item.trailerComment
let sortedTagNames = item.vehicleTags.keys.sorted(by: {$0 < $1}).compactMap({ item.vehicleTags[$0]})
print("Sorted tag names: \(sortedTagNames.map {$0.name})")
let joinedTagNames = sortedTagNames.map { $0.name}.joined(separator: ", ")
cell.tagNameLabel.text = joinedTagNames
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 150
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goChecklistAddComment" {
let addCommentVC = segue.destination as! ChecklistAddCommentVC
addCommentVC.delegate = self
}
if segue.identifier == "goChecklistAddTag" {
let addTagVC = segue.destination as! ChecklistAddTagVC
addTagVC.delegate = self
addTagVC.addedTags = itemSections[lastIndexPath.section].checklistItems[lastIndexPath.row].vehicleTags
}
}
}
// Receive Tags from ChecklistAddTagVC using the Delegate Pattern
extension ChecklistVC: ChecklistAddTagVCDelegate{
func receiveAddedTags(tags: [Int : Tag]) {
let item = self.itemSections[self.lastIndexPath.section].checklistItems[self.lastIndexPath.row]
item.vehicleTags = tags
}
}
TagsVC:
protocol ChecklistAddTagVCDelegate {
func receiveAddedTags(tags: [Int: Tag])
}
class ChecklistAddTagVC: UIViewController {
// Interface Links
@IBOutlet weak var tagsTableView: UITableView!
// Properties
var tagsDictionary: [Int: Tag] = [:]
var addedTags: [Int: Tag] = [:]
var delegate: ChecklistAddTagVCDelegate?
var indexPathForBtn: IndexPath!
override func viewDidLoad() {
super.viewDidLoad()
tagsTableView.tableFooterView = UIView()
tagsDictionary = [
1: Tag(remoteID: 1, categoryID: 1, name: "Tag1", color: "red"),
2: Tag(remoteID: 2, categoryID: 1, name: "Tag2", color: "blue"),
3: Tag(remoteID: 3, categoryID: 1, name: "Tag3", color: "orange"),
4: Tag(remoteID: 4, categoryID: 1, name: "Tag4", color: "black")
]
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("Added tags: \(addedTags.map {$1.name})")
setupButtons()
tagsTableView.reloadData()
}
}
extension ChecklistAddTagVC: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tagsDictionary.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "defectAndDamageTagCell", for: indexPath) as! ChecklistAddTagCell
cell.configCell()
cell.delegate = self
cell.tagNameLabel.text = tagsDictionary[indexPath.row + 1]?.name.capitalized
indexPathForBtn = indexPath
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
}
extension ChecklistAddTagVC: ChecklistAddTagCellDelegate{
// When the user press Add Tag then will be added in a dictionary and sent to ChecklistVC using a callback closure.
func addTagBtnPressed(button: UIButton, tagLabel: UILabel) {
let buttonPosition: CGPoint = button.convert(CGPoint.zero, to: tagsTableView)
let indexPath = tagsTableView.indexPathForRow(at: buttonPosition)
let indexPathForBtn: Int = indexPath?.row ?? 0
let tag: Tag = tagsDictionary[indexPathForBtn + 1] ?? Tag(remoteID: 0, categoryID: 0, name: String(), color: String())
if button.currentTitle == "+"{
button.setTitle("-", for: UIControl.State.normal)
tagLabel.textColor = UIColor.orange
// Add selected tag to Dictionary when the user press +
addedTags[tag.remoteID] = tag
}
else{
button.setTitle("+", for: UIControl.State.normal)
tagLabel.textColor = UIColor.black
// Delete selected tag from Dictionary when the user press -
addedTags.removeValue(forKey: tag.remoteID)
}
// Send the Dictionary to ChecklistVC
if delegate != nil{
delegate?.receiveAddedTags(tags: addedTags)
}
print("\n ****** UPDATED DICTIONARY ******")
print(addedTags.map {"key: \($1.remoteID) - name: \($1.name)"})
}
// Setup the state of the buttons and also the color of the buttons to be orange if that Tag exist in `addedTags` dictionary.
func setupButtons(){
for eachAddedTag in addedTags {
if eachAddedTag.value.remoteID == tagsDictionary[1]?.remoteID {
print(eachAddedTag)
}
}
}
}
这是我的错误的捕获:
如果您正在阅读本文,谢谢!
答案 0 :(得分:1)
首先,您需要一个数组而不是字典
tagsArr = [
Tag(remoteID: 1, categoryID: 1, name: "Tag1", color: "red"),
Tag(remoteID: 2, categoryID: 1, name: "Tag2", color: "blue"),
Tag(remoteID: 3, categoryID: 1, name: "Tag3", color: "orange"),
Tag(remoteID: 4, categoryID: 1, name: "Tag4", color: "black")
]
然后,vehicleTags
的属性应该是[Tag]()
,以了解在cellForRowAt
的{{1}}内部是否存在该属性
ChecklistAddTagVC