TableView单元格正在重复Swift

Question

因此，我向数据库发出GET请求，然后将数组中的每个元素添加到var mainComment: Comments?中的ViewModel中。在自定义单元格中，我将标签文本分配给ViewModel的mainComment.likes。我应该只为我的一个细胞获得一个赞，但这个赞在多个细胞中重复。https://giphy.com/gifs/L2U6FALmxWx981nO44

struct Comments: Codable {
var id:String?
var likes:Int?
}
import UIKit
import Foundation
class CommentViewModel {
var mainComment: Comments? 
}
//CommentVC
var comments:[CommentViewModel] = []
func loadComments(completion:@escaping(()->())) {
guard let post_id = post_id else {
return
}
let getComments = GETComments(id: post_id, path: "comments")
getComments.getAllById { comments in
self.comments = comments.map { comment in
let ret = CommentViewModel()
ret.mainComment = comment

return ret
}
self.myTableView.reloadData()
completion()
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "MyCell", for: indexPath as IndexPath) as! CommentCell
let item = comments[indexPath.item]
cell.viewModel = item

return cell
}

class CommentCell {
var viewModel: CommentViewModel? {
didSet {
if let item = viewModel {
if let numberOfLikes = item.mainComment?.likes {
self.numberOfLikes.text = "(numberOfLikes)"
}
}
}
lazy var numberOfLikes:UILabel = {
let label = UILabel()
label.textAlignment = .center
label.text = "0"
return label
}()
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
addSubview(numberOfLikes)
commentLikesConstraints()
}
func commentLikesConstraints() {
numberOfLikes.translatesAutoresizingMaskIntoConstraints = false
numberOfLikes.widthAnchor.constraint(equalToConstant: 60).isActive = true
numberOfLikes.heightAnchor.constraint(equalToConstant: 30).isActive = true
numberOfLikes.centerXAnchor.constraint(equalTo: likeBtn.centerXAnchor).isActive = true
numberOfLikes.topAnchor.constraint(equalTo: likeBtn.bottomAnchor, constant: -5).isActive = true
}

Answer 1

由于您使用mainComment和likes作为选项：

struct Comments: Codable {
var id:String?
var likes:Int?
}

您需要处理一个else案例(如果viewModel为零，则可能还需要一个else案例(：

var viewModel: CommentViewModel? {
didSet {
if let item = viewModel {
if let numberOfLikes = item.mainComment?.likes {
self.numberOfLikes.text = "(numberOfLikes)"
} else {
self.numberOfLikes.text = "0"
}
} else {
// do what you need to do if viewModel is nil
}
}
}