我的核心数据中有一些数据,并在表格视图中显示。当我单击单元格时,我想更新tableview行。
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath) as! ItemTableViewCell
cell.starImage.image = UIImage(named: "Gray star icon")
cell.selectionStyle = .none
let context = coreData.persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Item")
do {
let result = try context.fetch(request)
let img = UIImage(named: "Gray star icon")
for data in result as! [NSManagedObject] {
let data = img!.pngData() as NSData?
data?.setValue(data, forKey: "starImage")
}
} catch {
print("Failed")
}
coreData.saveContext()
tableView.reloadData()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") as? ItemTableViewCell else {
return UITableViewCell()
}
cell.itemName.text = itemCategoryNameArray[indexPath.row]
cell.itemDescription.text = itemDescriptionArray[indexPath.row]
cell.itemCategory.text = itemCategoryTypeArray[indexPath.row]
cell.starImage.image = UIImage(data: itemStarArray[indexPath.row])
cell.profileImage.image = UIImage(data: itemImageArray[indexPath.row])
return cell
}
但是我遇到了一些错误:-
由于未捕获的异常“ NSUnknownKeyException”而终止应用程序,
原因:'[
setValue:forUndefinedKey:]:此类不是键值
符合关键starImage的编码要求。”
最佳答案
请合并您的变量名称:循环中有两个不同的data
变量,这会导致混淆和错误
更好
for item in result as! [NSManagedObject] {
let data = img!.pngData() as? NSData
item.setValue(data, forKey: "starImage")
}
不过,我建议使用更具体的类型,并且仅创建一次图像
let request = NSFetchRequest<Item>(entityName: "Item")
do {
let result = try context.fetch(request)
let img = UIImage(named: "Gray star icon")
let data = img!.pngData() as? NSData
for item in result {
item.starImage = data
}
} catch {
print("Failed", error)
}
关于swift - 更新tableview和coredata,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55449066/