swift - 当我调用 reload tableView.reloadData() 时，自定义单元格属性不会更改

Question

我有一个带有自定义单元格的表格 View ，数据来自 Realm :

var Materials: Results<RealmMaterial>!

override func viewDidLoad() {
    let realm = RealmService.shared.realm
    Materials = realm.objects(RealmMaterial.self).filter("InspectResult == 0")
}

在每个单元格中，我都有一些按钮，其属性随单元格信息而变化。我这样处理:

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
    let cell = tableView.dequeueReusableCell(withIdentifier: "MaterialCell") as! MaterialsTableViewCell
    let myMaterial = Materials[indexPath.row]
    cell.materialCodeLbl.text = myMaterial.Number
    cell.materialDescLbl.text = myMaterial.Desc
    cell.redBtnOutlet.tag = myMaterial.Id
    cell.greenBtnOutlet.tag = myMaterial.Id
    cell.yellowBtnOutlet.tag = myMaterial.Id
    cell.cellView.layer.shadowColor = UIColor.black.cgColor
    cell.cellView.layer.shadowOpacity = 0.1
    cell.cellView.layer.shadowOffset = CGSize.zero
    cell.cellView.layer.shadowRadius = 10
    cell.cellView.layer.cornerRadius = 10
    cell.redBtnOutlet.layer.cornerRadius = 5
    cell.greenBtnOutlet.layer.cornerRadius = 5
    cell.yellowBtnOutlet.layer.cornerRadius = 5
    if myMaterial.InspectResult == 1 {
        cell.greenBtnOutlet.backgroundColor = UIColor(red: 137/255, green: 206/255, blue: 75/255, alpha: 1)
        cell.yellowBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
        cell.redBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
    }
    else if myMaterial.InspectResult == 2 {
        cell.redBtnOutlet.backgroundColor = UIColor(red: 253/255, green: 77/255, blue: 67/255, alpha: 1)
        cell.greenBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
        cell.yellowBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
    }
    else if myMaterial.InspectResult == 3 {
        cell.yellowBtnOutlet.backgroundColor = UIColor(red: 240/255, green: 192/255, blue: 16/255, alpha: 1)
        cell.greenBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
        cell.redBtnOutlet.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
    }
    return cell

}

但是当我重新加载数据单元格的对象属性不会改变。看起来cellForRowAt不会再次执行，并且属性来自单元格的索引。 第一次加载数据时，它工作正常。但是当我重新加载数据时，新数据不会再次改变

Answer 1

在我看来，您正在重新加载表格 View ，但实际上并未更新数据。

摘自您的陈述

It seams that cellForRowAt dose not execute again

我想您尚未真正确认 cellForRowAt 未执行，我的猜测是它正在执行，但 Materials 数组尚未更新您的新数据。

在调用 tableView.reloadData() 之前，确保 Materials 具有新数据。