我正在开发一个应用程序，用户可以将条目写入不同的主题，然后可以为条目提供上下点。我在tableViewController中使用了函数：
func tableView（tableView：UITableView，cellForRowAtIndexPath indexPath：NSIndexPath） - ＆gt;的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记，使其与该单元格的indexpath.row相同，我错了吗？因为当我然后尝试调用按钮时，它们的所有标签都是相同的并且等于0.我怎样才能给它们不同的标签？有没有办法以这种方式这样做？
当我想调用按钮时，这就是代码：
@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
}
}
我的tableView（tableView：UITableView，cellForRowAtIndexPath indexPath：NSIndexPath） - ＆gt; UITableViewCell功能如下：
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
}
答案 0 :(得分：2)
也许终于找到了一个问题。当我在我的项目中重现问题时，我意识到向下转向 UIButton的内容已经丢失。
所以在HubEntryTableViewCell子类中更新方法如下：
@IBAction func plus(sender: AnyObject) {
// self.tag, if called from UITableViewCell subclass, is rather cell's tag, not button's tag
let button = sender as! UIButton
print("button.tag = \(button.tag)")
...
}
答案 1 :(得分：0)
如果您已对tableview中的按钮点击执行操作，请尝试使用此代码，而不必担心标记...
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Eventcell", forIndexPath: indexPath)
let check1: UIButton = (cell.viewWithTag(11) as! UIButton)
let check2: UIButton = (cell.viewWithTag(12) as! UIButton)
check1.addTarget(self, action: #selector(EventListController.CloseMethod(_:event:)), forControlEvents: .TouchDown)
check2.addTarget(self, action: #selector(EventListController.CloseMethod1(_:event:)), forControlEvents: .TouchDown)
return cell
}
@IBAction func CloseMethod(sender: UIButton, event: AnyObject) {
let touches = event.allTouches()!
let touch = touches.first!
let currentTouchPosition = touch.locationInView(self.Eventlisttable)
let indexPath = self.Eventlisttable.indexPathForRowAtPoint(currentTouchPosition)!
print("\(Int(indexPath.row))")
}
@IBAction func CloseMethod1(sender: UIButton, event: AnyObject) {
let touches = event.allTouches()!
let touch = touches.first!
let currentTouchPosition = touch.locationInView(self.Eventlisttable)
let indexPath = self.Eventlisttable.indexPathForRowAtPoint(currentTouchPosition)!
print("\(Int(indexPath.row))")
}
如果我的回答对你有帮助，那就投票吧。谢谢..