TableView Parse Swift数据未在应用程序中显示

Question

我刚开始编码并搜索了几个帖子，但我无法找到为什么我的应用中的数据没有显示。

它正在获取我的数据，但我不明白如何将它添加到tableView我的第一个代码为“覆盖func tableView（tableView：UITableView，cellForRowAtIndexPath indexPath：NSIndexPath） - ＆gt; UITableViewCell”仍然存在，并请解释为什么它不起作用。想了解它为什么不起作用。

class MasterTableViewController: PFQueryTableViewController, PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate {

var noteObjects: NSMutableArray! = NSMutableArray()

@IBAction func logoutAction(sender: UIBarButtonItem) {
    PFUser.logOut()
    viewDidAppear(true)
}

// Initialise the PFQueryTable tableview
override init(style: UITableViewStyle, className: String!) {
    super.init(style: style, className: className)
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

    // Configure the PFQueryTableView
    self.parseClassName = "Note"
    self.textKey = "title"
    self.pullToRefreshEnabled = true
    self.paginationEnabled = false
}

// Define the query that will provide the data for the table view
override func queryForTable() -> PFQuery {
    var query = PFQuery(className: "Note")
    query.orderByAscending("updatedAt")
    return query
}

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

    if (PFUser.currentUser() == nil) {
        var logInViewController = PFLogInViewController()

        logInViewController.delegate = self

        var signUpViewController = PFSignUpViewController()

        signUpViewController.delegate = self

        logInViewController.signUpController = signUpViewController

        self.presentViewController(logInViewController, animated: true, completion: nil)

    }else {

        //self.fetchAllObjectsFromLocalDatastore()

        //self.fetchAllObjects()
    }
}

func fetchAllObjectsFromLocalDatastore() {

    var query: PFQuery = PFQuery(className: "Note")

    //query.cachePolicy = .CacheElseNetwork

    query.fromLocalDatastore()

    query.whereKey("username", equalTo: PFUser.currentUser()!.username!)

    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if (error == nil) {

            if let objects = objects as? [PFObject] {
                for object in objects {
                    println(object.objectId)
                }
            }

            var temp: PFObject = PFObject()

            self.noteObjects = temp.mutableCopy() as! NSMutableArray

            self.tableView.reloadData()

        }else {

            println(error!.userInfo)
        }
    }
}

func fetchAllObjects() {

    PFObject.unpinAllObjectsInBackgroundWithBlock(nil)

    var query: PFQuery = PFQuery(className: "Note")

    //query.cachePolicy = .CacheElseNetwork

    query.whereKey("username", equalTo: PFUser.currentUser()!.username!)

    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if (error == nil) {

            PFObject.pinAllInBackground(objects, block: nil)

            self.fetchAllObjectsFromLocalDatastore()

        }else {

            println(error!.userInfo)
        }
    }
}


// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 0
}

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

//override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell {

    var cell = tableView.dequeueReusableCellWithIdentifier("cell") as! MasterTableViewCell!
    if cell == nil {
        cell = MasterTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "cell")
    }

    // Extract values from the PFObject to display in the table cell
    if let titleLabel = object?["title"] as? String {
        cell?.masterTitleLabel?.text = titleLabel
    }
    if let textView = object?["text"] as? String {
        cell?.masterTextLabel?.text = textView
    }

    return cell
}

//First try did find the code above afterwards
/*override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! MasterTableViewCell

    // Configure the cell...

    var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row) as! PFObject

    cell.masterTitleLabel?.text = object["title"] as? String
    cell.masterTextLabel?.text = object["text"] as? String

    return cell
}*/

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    self.performSegueWithIdentifier("editNote", sender: self)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    var upcoming: AddNoteTableViewController = segue.destinationViewController as! AddNoteTableViewController

    if (segue.identifier == "editNote") {

        let indexPath = self.tableView.indexPathForSelectedRow()!

        var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row)as! PFObject

        upcoming.object = object;

        self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
    }
}


// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return NO if you do not want the specified item to be editable.
    return true
}


// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if editingStyle == .Delete {
        // Delete the row from the data source
        let objectToDelete = noteObjects?[indexPath.row] as! PFObject
        objectToDelete.deleteInBackgroundWithBlock {
            (success: Bool, error: NSError?) -> Void in
            if (success) {
                // Force a reload of the table - fetching fresh data from Parse platform
                self.fetchAllObjects()
            } else {
                // There was a problem, check error.description
            }
        }
    } else if editingStyle == .Insert {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }
}


//Signup and Login ViewController created by Parse
func logInViewController(logInController: PFLogInViewController, shouldBeginLogInWithUsername username: String, password: String) -> Bool {

    logInController.fields = (PFLogInFields.UsernameAndPassword
        | PFLogInFields.LogInButton
        | PFLogInFields.SignUpButton
        | PFLogInFields.PasswordForgotten)

    if (!username.isEmpty || !password.isEmpty) {
        return true
    }else  {
        return false
    }
}

func logInViewController(logInController: PFLogInViewController, didLogInUser user: PFUser) {
    self.dismissViewControllerAnimated(true, completion: nil)

}

func logInViewController(logInController: PFLogInViewController, didFailToLogInWithError error: NSError?) {
    println("Failed to log in...")
}

func signUpViewController(signUpController: PFSignUpViewController, shouldBeginSignUp info: [NSObject : AnyObject]) -> Bool {

    if let password = info["password"] as? String {

        return count(password.utf16) >= 8

    } else {
        return false
    }
}

func signUpViewController(signUpController: PFSignUpViewController, didSignUpUser user: PFUser) {
    self.dismissViewControllerAnimated(true, completion: nil)
}

func signUpViewController(signUpController: PFSignUpViewController, didFailToSignUpWithError error: NSError?) {
    println("Failed to sign up...")
}

func signUpViewControllerDidCancelSignUp(signUpController: PFSignUpViewController) {
    println("User dissmissed sign up.")
}
}

更新：更改numberOfSections没有帮助

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}

解决

它现在正在运行，更改了这部分代码

func fetchAllObjectsFromLocalDatastore() {

    var query: PFQuery = PFQuery(className: "Note")

    //query.cachePolicy = .CacheElseNetwork

    query.fromLocalDatastore()

    query.whereKey("username", equalTo: PFUser.currentUser()!.username!)

    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if (error == nil) {

            if let objects = objects as? [PFObject] {
                for object in objects {
                    println(object.objectId)
                }
            }

            //var temp: PFObject = PFObject()

            //self.noteObjects = temp.mutableCopy() as! NSMutableArray

            //println(self.noteObjects)

            self.tableView.reloadData()

        }else {

            println(error!.userInfo)
        }
    }
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete method implementation.
    // Return the number of rows in the section.
    return objects!.count
}

Answer 1

@DenisE我有同样的麻烦，你添加self.tableView.reloadData（）的解决方案修复了它。我们必须这样做的原因是我相信因为视图已经出现并且之后查询了数据，所以除非我们重新加载查询的数据，否则它不会反映在UI中。

Answer 2

您需要将部分的数量设置为1，否则没有要显示的部分，因此也没有内容。

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}