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我一直在使用swift和parse在线学习yikyak克隆的教程。我正在使用coreData存储upvoted/downvoted项目的objectID。当tableview单元格被加载时,它会检查parse中的objectID是否在coreData中,并通过将背景图像添加到特定按钮并禁用向上和向下按钮来响应。不过,我面临的一个问题是,上下滚动几次会导致随机单元格具有背景并禁用其按钮。Swift:Table Cells没有正确设置按钮
这里是代码(:)的cellForRowAtIndexPath链接:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as PullTableViewCell
let restaurant = self.restaurantData[indexPath.row]
cell.scoreLabel.text = "\(score)"
cell.plusButton.tag = indexPath.row;
cell.plusButton.addTarget(self, action: "plusOne:", forControlEvents: .TouchUpInside)
cell.minusButton.tag = indexPath.row
cell.minusButton.addTarget(self, action: "minusOne:", forControlEvents: .TouchUpInside)
if (cell.plusButton.enabled) {
// upvotes
let request = NSFetchRequest(entityName: "Upvotes")
let moc:NSManagedObjectContext = self.managedObjectContext!
var error: NSErrorPointer = nil
self.upvoteData = moc.executeFetchRequest(request, error: error) as [Upvotes]
for (var i = 0; i < self.upvoteData.count; i++) {
if (self.upvoteData[i].objectid == self.objectIDs[indexPath.row]) {
NSLog("the cell is in view is \(indexPath.row)")
cell.plusButton.backgroundColor = UIColor.blueColor()
cell.minusButton.enabled = false
cell.plusButton.enabled = false
}
}
// downvotes
let request2 = NSFetchRequest(entityName: "Downvotes")
let moc2:NSManagedObjectContext = self.managedObjectContext!
var error2: NSErrorPointer = nil
self.downvoteData = moc2.executeFetchRequest(request2, error: error2) as [Downvotes]
for (var i = 0; i < self.downvoteData.count; i++) {
if (self.downvoteData[i].objectid == self.objectIDs[indexPath.row]) {
cell.minusButton.backgroundColor = UIColor.blueColor()
cell.minusButton.enabled = false
cell.plusButton.enabled = false
}
}
}
return cell
}
是否有异步处理呢?
你应该把你的代码粘贴到帖子里面而不是链接它。你到目前为止还尝试过什么? – Aggressor 2015-02-09 22:06:38
编辑它。我试图创建2个新的数组,名为isUpvoted和isDownvoted,并为每个项目存储true和false。然后在cellForRowAtIndexPath中:它会检查它是否为真。如果它是真的,它会将背景设置为蓝色,并且按钮将被禁用。 (上下投票)。我仍然有同样的问题。 – Young 2015-02-09 22:15:22
所以它实际上每次向上或向下滚动都会创建新的单元格(您可以通过检查内存地址自行验证)。你需要做的是存储你想要的每个单元格的所有属性,并在这个方法中再次分配它们。 – Aggressor 2015-02-09 22:18:27