通过UITableViewCell中的UIButton更新模型
问题描述:
MainVC.swift
我正在捕获自定义“PlayerCell
”的标记。我想按increaseBtn
(UIButton
),这将增加了playerLbl.text
(UILabel
)由一个也更新我的模型(PlayerStore.player.playerScore: Int)
通过UITableViewCell中的UIButton更新模型
Main.swift:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
let player = players[indexPath.row]
cell.updateUI(player: player)
cell.increaseBtn.tag = indexPath.row
cell.decreaseBtn.tag = indexPath.row
return cell
} else {
return UITableViewCell()
}
}
PlayerCell.swift
class PlayerCell:UITableViewCell {
@IBOutlet weak var playerLbl: UILabel!
@IBOutlet weak var increaseBtn: UIButton!
@IBOutlet weak var decreaseBtn: UIButton!
@IBOutlet weak var scoreLbl: UILabel!
@IBOutlet weak var cellContentView: UIView!
func updateUI(player: Player){
playerLbl.text = player.playerName
scoreLbl.text = "\(player.playerScore)"
cellContentView.backgroundColor = player.playerColor.color
}
@IBAction func increaseBtnPressed(_ sender: AnyObject) {
let tag = sender.tag
// TODO: send this tag back to MainVC?
}
答
我会在这种情况下使用委托模式。创建一个Main.swift实现的协议,并且该PlayerCell.swift用作可选属性。因此,例如:
protocol PlayerIncrementor {
func increment(by: Int)
func decrement(by: Int)
}
然后使用上Main.swift的扩展,实现此协议
extension Main: PlayerIncrementor {
func increment(by: int) {
//not 100% what you wanted to do with the value here, but this is where you would do something - in this case incrementing what was identified as your model
PlayerStore.player.playerScore += by
}
}
内PlayerCell.swift的,添加一个委托财产,并在您@IBAction
class PlayerCell: UITableViewCell {
var delegate: PlayerIncrementor?
@IBOutlet weak var increaseBtn: UIButton!
@IBAction func increaseBtnPressed(_ sender: AnyObject) {
let tag = sender.tag
//call the delegate method with the amount you want to increment
delegate?.increment(by: tag)
}
最后 - 使这一切工作,主要分配作为代表到PlayerCell UITableViewCell.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "PlayerCell", for: indexPath) as? PlayerCell {
//self, in this case is Main - which now implements PlayerIncrementor
cell.delegate = self
//etc
你的'playerLbl'和'playerScore'在哪里?我没有在你的代码片段中看到它。 – t4nhpt
@ t4nhpt我用更多的相关信息更新了PlayerCell代码。 'playerScore'是一个Player类的属性,PlayerStore是一个管理播放器属性的类 – Macness