【发布时间】：2017-02-09 20:53:51
【问题描述】：
我正在开发一个应用程序，用户可以在其中编写不同主题的条目，然后可以放弃对条目的加分和减分。我在我的 tableViewController 中使用了这个函数：
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
我在这个函数的末尾添加了这两行：
cell.plusButton.tag = indexPath.row
cell.minusButton.tag = indexPath.row
所以这应该给 tableView 中的每个按钮一个标签，以便它与那个单元格的 indexpath.row 相同，我错了吗？因为当我尝试调用按钮时，它们的所有标签都相同并且等于 0。我怎样才能给它们不同的标签？这样就没有办法了吗？
这是我想要调用按钮时的代码：
@IBAction func plus(sender: AnyObject) {
print(self.tag)
let ref = FIRDatabase.database().reference().child("topics/"+topicClicked+"/"+entriesArrayTwo[self.tag])
var value = Int()
var date = String()
var user = String()
var votedDown = [""]
var votedUp = [""]
ref.observeSingleEventOfType(.Value, withBlock: { snapshot in
let dict = snapshot.value as! [String: AnyObject]
value = dict["point"] as! Int
date = String(dict["date"]!)
user = String(dict["user"]!)
votedUp = dict["votedUp"] as! NSArray as! [String]
votedDown = dict["votedDown"] as! NSArray as! [String]
var tempBool = false
var temp = -1
for uid in votedDown {
temp = temp + 1
if uid == FIRAuth.auth()?.currentUser?.uid {
votedDown.removeAtIndex(temp)
tempBool = true
}
}
if tempBool == false {
votedUp.append((FIRAuth.auth()?.currentUser?.uid)!)
}
ref.setValue(["point": value+1, "date": date, "user": user, "votedDown": votedDown, "votedUp": votedUp])
self.point.text = String(value+1)
})
if minusButton.hidden == true {
minusButton.hidden = false
} else {
plusButton.hidden = true
}
}
My tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 函数如下：
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "entryCell", for: indexPath) as! HubEntryTableViewCell
if self.resultSearchController.isActive {
let ref = FIRDatabase.database().reference().child("topics/"+topicClicked+"/"+filteredTableData[(indexPath as NSIndexPath).row])
ref.observeSingleEvent(of: .value, with: { snapshot in
let value = snapshot.value as? NSDictionary
cell.point.text = String(describing: value!["point"]!)
let postRef = FIRDatabase.database().reference().child("users/"+String(describing: value!["user"]!))
postRef.observeSingleEvent(of: .value, with: { snapshotTwo in
let valueTwo = snapshotTwo.value as? NSDictionary
cell.subInfo.text = String(describing: valueTwo!["name"]!)+" "+String(describing: valueTwo!["surname"]!)+" - "+String(describing: value!["date"]!)
})
})
cell.entry.text = self.filteredTableData[(indexPath as NSIndexPath).row]
} else {
let ref = FIRDatabase.database().reference().child("topics/"+topicClicked+"/"+entriesArray[(indexPath as NSIndexPath).row])
ref.observeSingleEvent(of: .value, with: { snapshot in
let value = snapshot.value as? NSDictionary
cell.point.text = String(describing: value!["point"]!)
let postRef = FIRDatabase.database().reference().child("users/"+String(describing: value!["user"]!))
postRef.observeSingleEvent(of: .value, with: { snapshotTwo in
let valueTwo = snapshotTwo.value as? NSDictionary
cell.subInfo.text = String(describing: valueTwo!["name"]!)+" "+String(describing: valueTwo!["surname"]!)+" - "+String(describing: value!["date"]!)
})
let votedUpRef = ref.child("votedUp")
votedUpRef.observeSingleEvent(of: .value, with: { upSnapshot in
var tempDict = snapshot.value as! [String: AnyObject]
let tempArray = tempDict["votedUp"] as! [String]
for uid in tempArray {
if String(uid) == FIRAuth.auth()?.currentUser?.uid {
cell.plusButton.isHidden = true
}
}
})
let votedDownRef = ref.child("votedDown")
votedUpRef.observeSingleEvent(of: .value, with: { upSnapshot in
var tempDict = snapshot.value as! [String: AnyObject]
let tempArray = tempDict["votedDown"] as! [String]
for uid in tempArray {
if String(uid) == FIRAuth.auth()?.currentUser?.uid {
cell.minusButton.isHidden = true
}
}
})
})
cell.entry.text = self.entriesArray[(indexPath as NSIndexPath).row]
}
cell.plusButton.tag = (indexPath as NSIndexPath).row
cell.minusButton.tag = (indexPath as NSIndexPath).row
// NEW METHOD TO GET THE BUTTON
let check1: UIButton = (cell.viewWithTag(1) as! UIButton)
let check2: UIButton = (cell.viewWithTag(2) as! UIButton)
check1.addTarget(self, action: #selector(HubEntriesTableViewController.CloseMethod(_:event:)), for: .touchDown)
check2.addTarget(self, action: #selector(HubEntriesTableViewController.CloseMethod1(_:event:)), for: .touchDown)
// Configure the cell...
return cell
}
【问题讨论】：
-
分享我们粘贴您的整个代码与您在按钮单击中所做的事情
-
我指的是一个数据库，其中孩子来自按下按钮的标签。像这样：让 ref = FIRDatabase.database().referance().child("self.tag")，但在我的情况下标签始终为 0
-
set cell.buttonPlus.Tag = indexpath.row+UniqueNumber set cell.buttonMinus.Tag = indexpath.row+UniqueNumber(different) 就可以轻松搞定了。
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@DevThakur 你能说得更具体点吗？什么是 uniqueNumber 和 buttonPlusTag？它们是不同的变量吗？
-
Like For减号按钮唯一编号可能是（1000）和加号我将使用（5000）现在我可以设置标签，如cell.plusbutton.tag = indexpath.row+（5000），我什么时候会明白了，我可以通过 uniqueNumber 减少 button.tag 示例：标签将是 50001（对于 indexpath.row ==1） newTag = btnTag-(UniqueNumber)
标签： ios swift firebase tableview firebase-realtime-database