iOS 如何知道按下了哪个按钮 CollectionView 与自定义委托

Question

所以我在 collectionview 中有一个单元格，里面有 3 个按钮。为了使用这些按钮触发代码，我实现了一个自定义委托。现在正在触发代码，但我不知道代码是从哪个单元格触发的。我怎样才能最好地实现这一点？这是我的一些代码。协议：

protocol OverViewDelegate {
func registerButtonClicked()
func evaluateButtonClicked()
func overviewButtonClicked()
}

cellForItemAt:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "sessionCell", for: indexPath) as? SessionCollectionViewCell
    let session: SessionModel
    session = DebugData.shared.sessionArray[indexPath.row]

    cell?.sessionImage.image = #imageLiteral(resourceName: "carControl")
    cell?.sessionNameLabel.text = session.name
    cell?.sessionLocationLabel.text = session.location
    cell?.overViewDelegate = self

    return cell!
}

单元格：

import UIKit

导入 IBAnimatable

@IBOutlet weak var sessionImage: UIImageView!
@IBOutlet weak var sessionNameLabel: UILabel!
@IBOutlet weak var sessionLocationLabel: UILabel!
@IBOutlet weak var sessionRegisterButton: AnimatableButton!
@IBOutlet weak var sessionOverviewButton: AnimatableButton!
@IBOutlet weak var sessionEvaluateButton: AnimatableButton!

var overViewDelegate: OverViewDelegate?

@IBAction func registerButtonClicked(_ sender: Any) {
    overViewDelegate?.registerButtonClicked()
}

@IBAction func overviewButtonClicked(_ sender: Any) {
    overViewDelegate?.overviewButtonClicked()
}

@IBAction func evaluateButtonClicked(_ sender: Any) {
    overViewDelegate?.evaluateButtonClicked()
}

如有任何帮助，我们将不胜感激。

Answer 1

在 cellForItemAt: 方法中，您可以指定 tag 值，当点击按钮时，您可以检查 sender.tag 以检查哪个按钮被点击。

Answer 2

您可以通过为 cellForItemAt 中的所有按钮添加标签来实现它：如下所示

cell.sessionRegisterButton.tag = indexPath.item
cell.sessionOverviewButton.tag = indexPath.item
cell.sessionEvaluateButton.tag = indexPath.item

并通过 :

取回索引

@IBAction func registerButtonClicked(_ sender: Any) {
    let senderButton : UIButton = sender as! UIButton
    let index : Int = senderButton.tag
    overViewDelegate?.registerButtonClicked()
}

@IBAction func overviewButtonClicked(_ sender: Any) {
    let senderButton : UIButton = sender as! UIButton
    let index : Int = senderButton.tag
    overViewDelegate?.overviewButtonClicked()
}

@IBAction func evaluateButtonClicked(_ sender: Any) {
    let senderButton : UIButton = sender as! UIButton
    let index : Int = senderButton.tag
    overViewDelegate?.evaluateButtonClicked()
}

Answer 3

在您的单元格中放置一个变量，并在 cellForRowAt 中保存您的会话数据模型实例。然后更新您的委托方法并为每个方法添加一个会话参数。

所以每次按下按钮时都有数据模型的实例

Answer 4

您可以在 cellForItemAt:

中使用按钮标签进行检查

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "sessionCell", for: indexPath) as? SessionCollectionViewCell

    cell.YOUR_BUTTON.tag = indexPath.item

    return cell!
}

Answer 5

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "sessionCell", for: indexPath) as? SessionCollectionViewCell
let session: SessionModel
session = DebugData.shared.sessionArray[indexPath.row]

cell.sessionRegisterButton.tag = indexPath.row  // --- add this
..........

cell?.sessionImage.image = #imageLiteral(resourceName: "carControl")
cell?.sessionNameLabel.text = session.name
cell?.sessionLocationLabel.text = session.location
cell?.overViewDelegate = self


return cell!
}
@IBAction func registerButtonClicked(_ sender: Any) {
let cellIndex = sender.tag   // this will be the cell index
overViewDelegate?.registerButtonClicked()

}

Answer 6

在单元格中传递 indexPath 值 class return 在按钮点击功能上返回 indexPath

协议：-

protocol OverViewDelegate {
func registerButtonClicked(_ indexPath : IndexPath)
func evaluateButtonClicked(_ indexPath : IndexPath)
func overviewButtonClicked(_ indexPath : IndexPath)
}

cellForItemAt:

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "sessionCell", for: indexPath) as? SessionCollectionViewCell
        let session: SessionModel
        session = DebugData.shared.sessionArray[indexPath.row]

        cell?.sessionImage.image = #imageLiteral(resourceName: "carControl")
        cell?.sessionNameLabel.text = session.name
        cell?.sessionLocationLabel.text = session.location
        cell?.overViewDelegate = self
        cell?.indexPath = indexPath

        return cell!
    }

单元格：

@IBOutlet weak var sessionImage: UIImageView!
@IBOutlet weak var sessionNameLabel: UILabel!
@IBOutlet weak var sessionLocationLabel: UILabel!
@IBOutlet weak var sessionRegisterButton: AnimatableButton!
@IBOutlet weak var sessionOverviewButton: AnimatableButton!
@IBOutlet weak var sessionEvaluateButton: AnimatableButton!

var overViewDelegate: OverViewDelegate?
var indexPath : IndexPath?

@IBAction func registerButtonClicked(_ sender: Any) {
    overViewDelegate?.registerButtonClicked(indexPath)
}

@IBAction func overviewButtonClicked(_ sender: Any) {
    overViewDelegate?.overviewButtonClicked(indexPath)
}

@IBAction func evaluateButtonClicked(_ sender: Any) {
    overViewDelegate?.evaluateButtonClicked(indexPath)
}

获取单元格使用：-

let cell = tableView.cellForRow(at: indexPath)

Answer 7

最好的方法是在协议方法中发回信元.. 例如

protocol OverViewDelegate {
  func registerButtonClicked(cell: SessionCollectionViewCell)
  func evaluateButtonClicked(cell: SessionCollectionViewCell)
  func overviewButtonClicked(cell : SessionCollectionViewCell)

}

点击按钮

@IBAction func overviewButtonClicked(_ sender: Any) {
    overViewDelegate?.overviewButtonClicked(cell: self)
}

在你 viewcontroller 实现委托方法时

func overviewButtonClicked(cell: SessionCollectionViewCell) {
     // here you get the cell and all the properties you want to access of that cell and also

    if let indexPath = self.tableView.indexPath(for: cell) {
       // do what you want to do
    }
 }

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