每个TableView Cell都会更新,而不是只更新一个。

时间:2015-10-29 18:28:08

标签: ios swift uitableview

我有两个按钮(喜欢/不喜欢),就像拇指向上和向下投票系统风格一样。当我点击按钮时,每个单元格都会更新。有没有办法解决这个问题,以便只有被点击的更新?

另外,如何重新加载单元格以便我不必拉动刷新来更新button.setTitle值?

这是我的代码:

if (affectedRows == 1)

}

PFTableViewCell:

class UserFeedCell: PFTableViewCell {

@IBOutlet weak var likeButton: UIButton!
@IBOutlet weak var dislikeButton: UIButton!


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)
print(likeCount)
print(dislikeCount)

}

@IBAction func likeButton(sender: UIButton) {
buttonWasClickedForVote(1)
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 }

}

1 个答案:

答案 0 :(得分:1)

您可以使用委托机制

来完成

为您的操作创建protocol

 protocol LikeProtocol {
        func likeOrDislikeActionAtRow(row: Int)
    }

让您的TableViewController班级确认此协议:

class YourTableViewController: UITableViewController, LikeProtocol {
    ...
    func likeOrDislikeActionAtRow(row: Int) {
        ...
        // Reload only you want cell
        self.tableView.beginUpdates()
        self.tableView.reloadRowsAtIndexPaths([NSIndexPath(forRow: row, inSection: 1)], withRowAnimation: UITableViewRowAnimation.Fade)
        self.tableView.endUpdates()
        ...
    }
    ...
}

使用PFTableViewCellprotocol变量上的类型添加到row委托对象:

var delegate: LikeProtocol?
var rowValue: Int?

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)

设置委托和行
cell.delegate = self
cell.row = indexPath.row

在你喜欢和不喜欢的行动中调用协议方法:

@IBAction func likeButton(sender: UIButton) {
    ....
    delegate!.likeOrDislikeActionAtRow(row!)
    ....
}