“索引超出范围”同时刷新表 - 斯威夫特

Question

视图控制器中有两个按钮，下面有一个表格视图。使用不同的过滤器参数按下两个按钮之一时，将刷新表视图。实际上，当加载表视图然后单击另一个按钮时，它工作正常，表刷新。但是，当您在表格视图中滚动并且滚动仍然发生时，您按下另一个按钮，我得到“索引超出范围”错误。尝试了很多东西来解决它，但事实并非如此。有任何想法吗？我使用解析作为免费会员资格。我的代码的重要部分如下：

  @IBAction func filterType0_clicked(sender: AnyObject) {

    if filterTypeVar != 0 {


        self.activityIndicator.startAnimating()
        self.waitView.hidden = false

    filterTypeVar = 0
    refreshResults()
    }
}

@IBAction func filterType1_clicked(sender: AnyObject) {

    if filterTypeVar != 1 {

        self.activityIndicator.startAnimating()
        self.waitView.hidden = false

    filterTypeVar = 1
    refreshResults()
    }
}



func refreshResults() {


    resultsNameArray.removeAll(keepCapacity: false)
    resultsUserNameArray.removeAll(keepCapacity: false)
    resultsObjectIdArray.removeAll(keepCapacity: false)


    var query = PFQuery(className: “posts”)
    query.whereKey("userName", containedIn: usersArray)

    if filterTypeVar == 0 {
    println("no filter")
    }
    else {
    query.whereKey("Type", equalTo: filterTypeVar)
    }

    query.addDescendingOrder("createdAt")
    query.limit = 10

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

        if error == nil {

            for object in objects! {

                self.resultsNameArray.append(object.objectForKey("profileName") as! String)
                self.resultsUserNameArray.append(object.objectForKey("userName") as! String)
                self.resultsObjectIdArray.append(object.objectId as String!)

                      self.resultsTable.reloadData()

            }

            if self.resultsNameArray.isEmpty {
            self.resultsTable.hidden = true
            }

            else {
            self.resultsTable.hidden = false
            }



            self.activityIndicator.stopAnimating()
            self.waitView.hidden = true


        }

    }

}



func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {


    return resultsNameArray.count

}



func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {

            return 127

}






func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    var cell:mainCell = tableView.dequeueReusableCellWithIdentifier("Cell") as! mainCell



    cell.profileLbl.setTitle(self.resultsNameArray[indexPath.row], forState: UIControlState.Normal)
    cell.usernameLbl.text = self.resultsUserNameArray[indexPath.row]
    cell.objectid.text = self.resultsObjectIdArray[indexPath.row]


    return cell

}

Answer 1

尝试在 之后重新加载表格数据 ，您已完成提取并填写数据数组。此外，清除数据阵列一旦您有查询数据。

例如，在您的refreshResults方法中，将self.resultsTable.reloadData()移到for循环之外：

resultsNameArray.removeAll(keepCapacity: false)
resultsUserNameArray.removeAll(keepCapacity: false)
resultsObjectIdArray.removeAll(keepCapacity: false)
// You could reload again here; this might be superfluous.
self.resultsTable.reloadData()

for object in objects! {

    self.resultsNameArray.append(object.objectForKey("profileName") as! String)
    self.resultsUserNameArray.append(object.objectForKey("userName") as! String)
    self.resultsObjectIdArray.append(object.objectId as String!)
}

// Moved the refresh outside of loop so that you
// aren't reloading the table until you've finished
// loading your data.
self.resultsTable.reloadData()