ios - 从核心数据删除后重新加载表格 View

Question

当单击按钮时，我正在删除 CoreData 中的所有项目，但应用程序将在删除后崩溃并给出此错误

fatal error: unexpectedly found nil while unwrapping an Optional value

我尝试过的代码:

if let rf = response{
    let fetchRequest = NSFetchRequest()
    fetchRequest.entity = NSEntityDescription.entityForName("Cart", inManagedObjectContext: moc)
    fetchRequest.includesPropertyValues = false
    let context:NSManagedObjectContext = appDel.managedObjectContext
    let moc = context
    do {
        if let results = try moc.executeFetchRequest(fetchRequest) as? [NSManagedObject] {
            for result in results {
                moc.deleteObject(result)
                self.tableView.reloadData()
            }
            try moc.save()
            
        }
            } catch {
                print("FAILED")
            }
}

              

Answer 1

您需要重新初始化数组或从数组中删除所有对象，然后在 for 循环 之后重新加载表，如下所示。

for result in results {
    moc.deleteObject(result)        
}
try moc.save()
yourArray = [NSManagedObject]() //The array that you have used with UITableViewDataSource method
//OR
yourArray.removeAll()
self.tableView.reloadData()