Question

我目前正在尝试将不同的实体从我的CoreData模型加载到一个UITableView中但在不同的部分下。我尝试过以下方法：

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    // #warning Incomplete method implementation.
    // Return the number of rows in the section.

    var rows = 0

    if section == 0 {
        rows = crew.count
    } else if section == 1 {
        rows = aircraft.count
    } else if section == 2 {
        rows = batteries.count
    }

    return rows
}

但这似乎不起作用。它返回每个部分的第一个crew.count。我应该注意到，机组人员，飞机和电池都是NSManagedObject的数组。

有没有人对如何实施我正在寻找的内容有任何建议？

感谢。

编辑：以下是我为实现清晰而实施的其他方法。

var crew = [NSManagedObject]()
var aircraft = [NSManagedObject]()
var batteries = [NSManagedObject]()

override func viewWillAppear(animated: Bool)
{
    super.viewWillAppear(animated)

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let managedContext = appDelegate.managedObjectContext!

    let crewFetchRequest = NSFetchRequest(entityName:"Crew")
    var crewError: NSError?
    let crewFetchedResults = managedContext.executeFetchRequest(crewFetchRequest, error: &crewError) as? [NSManagedObject]
    if let crewResults = crewFetchedResults {
        crew = crewResults
    } else {
        println("Could not fetch \(crewError), \(crewError!.userInfo)")
    }

    let aircraftFetchRequest = NSFetchRequest(entityName:"Aircraft")
    var aircraftError: NSError?
    let aircraftFetchedResults = managedContext.executeFetchRequest(aircraftFetchRequest, error: &aircraftError) as? [NSManagedObject]
    if let aircraftResults = crewFetchedResults {
        aircraft = aircraftResults
    } else {
        println("Could not fetch \(aircraftError), \(aircraftError!.userInfo)")
    }

    let batteryFetchRequest = NSFetchRequest(entityName:"Battery")
    var batteryError: NSError?
    let batteryFetchedResults = managedContext.executeFetchRequest(batteryFetchRequest, error: &batteryError) as? [NSManagedObject]
    if let batteryResults = crewFetchedResults {
        batteries = batteryResults
    } else {
        println("Could not fetch \(batteryError), \(batteryError!.userInfo)")
    }
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int
{
    // #warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 3
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    // #warning Incomplete method implementation.
    // Return the number of rows in the section.

    var rows = 0

    if section == 0 {
        rows = crew.count
    } else if section == 1 {
        rows = aircraft.count
    } else if section == 2 {
        rows = batteries.count
    }

    return rows
}

override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String?
{
    return sectionTitles[section]
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell = tableView.dequeueReusableCellWithIdentifier("CrewCell", forIndexPath: indexPath) as! UITableViewCell

    // Configure the cell...
    switch indexPath.section.description
    {
        case "0":
            cell.textLabel!.text = crew[indexPath.item].valueForKey("name") as? String
            if crew[indexPath.item].valueForKey("pilot") as? Bool == true {
                cell.detailTextLabel!.text = "Pilot"
            } else {
                cell.detailTextLabel!.text = " "
            }
            break;
        case "1":
            cell.textLabel!.text = "Aircraft"
            break;
        case "2":
            cell.textLabel!.text = "Battery"
            break;
        default:
            break;
    }

    return cell
}

Answer 1

您的代码很好，但您需要通过实施

来设置tableview中的部分数量

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 3
}

编辑：

从编辑过的问题中，我现在可以清楚地看到您的问题与数据源有关

let aircraftFetchRequest = NSFetchRequest(entityName:"Aircraft")
var aircraftError: NSError?
let aircraftFetchedResults = managedContext.executeFetchRequest(aircraftFetchRequest, error: &aircraftError) as? [NSManagedObject]
if let aircraftResults = crewFetchedResults {
    aircraft = aircraftResults
} else {
    println("Could not fetch \(aircraftError), \(aircraftError!.userInfo)")
}

let batteryFetchRequest = NSFetchRequest(entityName:"Battery")
var batteryError: NSError?
let batteryFetchedResults = managedContext.executeFetchRequest(batteryFetchRequest, error: &batteryError) as? [NSManagedObject]
if let batteryResults = crewFetchedResults {
    batteries = batteryResults
}

if let aircraftResults = crewFetchedResults和if let batteryResults = crewFetchedResults将返回crewFetchResults，因此所有工作人员，飞机和电池阵列都保持完全相同的元素。您必须使用if let aircraftResults = aircraftFetchedResults和if let batteryResults = batteryFetchedResults替换这些行。希望我足够清楚

UITableViewController - 每个部分的单元格数不同

1 个答案: