Question

在我的应用程序中，用户在HomeViewController中选择A或B，然后在LocationViewController中，他们从tableview中选择一个位置，最后，ResultViewController统计来自其他用户的投票。

我坚持在LocationViewController中将用户选择注册到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的新手，我在AppCoda的this tutorial的帮助下成功实现了这一目标。任何帮助表示赞赏：）

Answer 1

这是我的解决方案，没有我想要注册投票给用户身份的部分。不确定它是否是最有效的方式，请随意发表评论：

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)
}

如何在用户点按表格行时向Firebase数据添加计数

1 个答案: