我有一个表格视图单元格和UITableViewController。我在表格视图单元格中有两个 IBOutlets （喜欢/不喜欢）。我在TableViewController中也有两个 IBActions 。单击 IBActions 时，它会更新表视图中的每个单元格。这是我的代码：
表视图控制器：
class UserFeedTableViewController: PFQueryTableViewController {
var shouldReloadOnAppear: Bool = true
// Votes: -1 for dislike, 1 for like, 0 for no vote
var vote: Int = 0 // initialize to user's existing vote, retrieved from the server
var likeCount: Int = 0 // initialize to existing like count, retrieved from the server
var dislikeCount: Int = 0 // initialize to existing dislike count, retrieved from the server
@IBAction func dislikeButton(sender: UIButton) {
buttonWasClickedForVote(-1)
self.tableView.reloadData()
print(likeCount)
print(dislikeCount)
}
@IBAction func likeButton(sender: UIButton) {
buttonWasClickedForVote(1)
self.tableView.reloadData()
print(likeCount)
print(dislikeCount)
}
private func buttonWasClickedForVote(buttonVote: Int) {
if buttonVote == vote {
// User wants to undo her existing vote.
applyChange(-1, toCountForVote: vote)
vote = 0
}
else {
// User wants to force vote to toggledVote.
// Undo current vote, if any.
applyChange(-1, toCountForVote: vote)
// Apply new vote.
vote = buttonVote
applyChange(1, toCountForVote: vote)
}
}
private func applyChange(change: Int, toCountForVote vote: Int ) {
if vote == -1 { dislikeCount += change }
else if vote == 1 { likeCount += change }
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell? {
let CellIdentifier = "Cell"
var cell: UserFeedCell? = tableView.dequeueReusableCellWithIdentifier(CellIdentifier, forIndexPath: indexPath) as? UserFeedCell
if cell == nil {
cell = UserFeedCell(style: UITableViewCellStyle.Default, reuseIdentifier: CellIdentifier)
}
if object != nil {
cell!.likeButton.selected = vote == 1
cell!.dislikeButton.selected = vote == -1
cell!.likeButton.setTitle("\(likeCount)", forState: .Normal)
cell!.dislikeButton.setTitle("\(dislikeCount)", forState: .Normal)
}
return cell
}
表视图单元格：
class UserFeedCell: PFTableViewCell {
@IBOutlet weak var likeButton: UIButton!
@IBOutlet weak var dislikeButton: UIButton!
var post: PFObject? {
didSet{
}
} }