ios - 当用户点击表格行时如何向 Firebase 数据添加计数

Question

在我的应用程序中，用户在 HomeViewController 中选择 A 或 B，然后在 LocationViewController 中从表视​​图中选择一个地点，最后，ResultViewController 统计其他用户的投票。

我一直在将用户选择注册到 LocationViewController 中的 Firebase

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if userVote == "A" {
        // add vote count by 1 to A of Location ABC in Firebase
        // register this vote to user's path too
    } else {
        // add vote count by 1 to B of Location ABC in Firebase
        // register this vote to user's path too
    }
}

我是 iOS、Swift 和 Firebase 新手，在 this tutorial 的帮助下我成功做到了这一点在AppCoda。如有任何帮助，我们将不胜感激:)

Answer 1

这是我的解决方案，没有我想要将投票注册到用户 ID 的部分。不确定这是否是最有效的方法，请随时发表评论:

var businesses = [Business]()

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let indexPath = tableView.indexPathForSelectedRow!
    let business = businesses[indexPath.row]
    // Get the Firebase key of the selected row
    let businessId = business.businessKey
    // Get the path to the vote data
    let voteARef = ref.childByAppendingPath(businessId).childByAppendingPath("voteA")
    let voteBRef = ref.childByAppendingPath(businessId).childByAppendingPath("voteB")

    if userVote == "voteA" {

        voteARef.runTransactionBlock({
            (currentData:FMutableData!) in
            var value = currentData.value as? Int
            if (value == nil) {
                value = 0
            }
            currentData.value = value! + 1
            return FTransactionResult.successWithValue(currentData)
        })


    } else {

        voteBRef.runTransactionBlock({
            (currentData:FMutableData!) in
            var value = currentData.value as? Int
            if (value == nil) {
                value = 0
            }
            currentData.value = value! + 1
            return FTransactionResult.successWithValue(currentData)
        })
    }

    performSegueWithIdentifier("ResultSegue", sender: self)
}