ios - 滚动 ios swift 时刷新表格

Question

我有带有自定义单元格的 tableView。如果用户向下滚动表格，我会从互联网加载一些信息并将其添加到表格中。问题:加载信息后，新单元格有时会重写旧单元格，有时滚动时表格中会出现空白单元格。这是我的代码:

var Bool canEdit = true
@IBOutlet var table : UITableView!
var eventList : [EventCell] = [] // EventCell - custom cell class

func addEventsAndRefresh() {
   if (canEdit){        
       canEdit = false
       HTTPManager.getEvents(isFuture: true, offset: eventList.count, didLoad: getEvents) //it creates url and call function "getEvents" after ending async request
   }    
}

func getEvents(response : NSURLResponse!, data : NSData!, error : NSError!) {
    if ((error) != nil) {
        HTTPManager.showErrorAlert()
    } else {
        var result = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSArray
        for elementOfArray in result {
            var cell : EventCell = table.dequeueReusableCellWithIdentifier("EventCell") as EventCell
            ... // parsing result to cell
            eventList.append(cell)
            
        }
        table.reloadData()
        canEdit = true
    }
}


func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
    return eventList.count
}

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
    return eventList[indexPath.row]
}

func scrollViewDidEndDragging(scrollView: UIScrollView!, willDecelerate decelerate: Bool) {
    var currentOffset = scrollView.contentOffset.y;
    var maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height;
    
    if (maximumOffset - currentOffset <= -40.0 && canEdit) {
        addEventsAndRefresh()
    }
}

Answer 1

当我像你一样重用单元格变量时，我遇到了同样的问题。尽量不要将单元格放在列表中，而是将结果列表保存为实例变量，并通过 cellForRowAtIndexPath 函数中的索引获取对象，如下所示。

func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
     var cell : EventCell = table.dequeueReusableCellWithIdentifier("EventCell") as EventCell
     var element = result[indexPath.row] as YourObject
     //Do something with cell
     return cell
}