單擊單元格中的按鈕獲取 UITableViewCell 的 indexPath

Question

我在UITableViewCell有一個按鈕（紅色十字），單擊該按鈕時我想獲取UITableViewCell indexPath 。

現在，我正在為每個按鈕分配標簽，例如cell.closeButton.tag = indexPath.section和單擊按鈕時，我會得到indexPath.section值，如下所示：

@IBAction func closeImageButtonPressed(sender: AnyObject) {
  data.removeAtIndex(sender.tag)
  tableView.reloadData()
}

這是正確的實施方式還是有其他干凈的方法來做到這一點？

Answer 1

使用委托：

MyCell.swift：

import UIKit

//1. delegate method
protocol MyCellDelegate: AnyObject {
    func btnCloseTapped(cell: MyCell)
}

class MyCell: UICollectionViewCell {
    @IBOutlet var btnClose: UIButton!

    //2. create delegate variable
    weak var delegate: MyCellDelegate?

    //3. assign this action to close button
    @IBAction func btnCloseTapped(sender: AnyObject) {
        //4. call delegate method
        //check delegate is not nil with `?`
        delegate?.btnCloseTapped(cell: self)
    }
}

MyViewController.swift：

//5. Conform to delegate method
class MyViewController: UIViewController, MyCellDelegate, UITableViewDataSource,UITableViewDelegate {

    //6. Implement Delegate Method
    func btnCloseTapped(cell: MyCell) {
        //Get the indexpath of cell where button was tapped
        let indexPath = self.collectionView.indexPathForCell(cell)
        print(indexPath!.row)
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCellWithIdentifier("MyCell") as! MyCell
        //7. delegate view controller instance to the cell
        cell.delegate = self

        return cell
    }
}

Answer 2

如何使用按鈕選擇器獲取用於在 Swift 4 中點擊按鈕的單元格索引路徑

@objc func buttonClicked(_sender:UIButton){

 let buttonPosition = sender.convert(CGPoint.zero, to: self.tableView)
 let indexPath = self.tableView.indexPathForRow(at:buttonPosition)
 let cell = self.tableView.cellForRow(at: indexPath) as! UITableViewCell
 print(cell.itemLabel.text)//print or get item
}

Answer 3

嘗試最好地使用 swift 閉包：簡單、快速和簡單。

在 cellForRowAtIndexPath 方法中：

let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCellIdentifier", for: indexPath) as! CustomCell

cell.btnTick.mk_addTapHandler { (btn) in
     print("You can use here also directly : \(indexPath.row)")
     self.btnTapped(btn: btn, indexPath: indexPath)
}

CellForRowAtIndexPath 方法中外部使用的 Selector 方法：

func btnTapped(btn:UIButton, indexPath:IndexPath) {
    print("IndexPath : \(indexPath.row)")
}

UIButton 的擴展：

extension UIButton {

    private class Action {
        var action: (UIButton) -> Void

        init(action: @escaping (UIButton) -> Void) {
            self.action = action
        }
    }

    private struct AssociatedKeys {
        static var ActionTapped = "actionTapped"
    }

    private var tapAction: Action? {
        set { objc_setAssociatedObject(self, &AssociatedKeys.ActionTapped, newValue, .OBJC_ASSOCIATION_RETAIN) }
        get { return objc_getAssociatedObject(self, &AssociatedKeys.ActionTapped) as? Action }
    }


    @objc dynamic private func handleAction(_ recognizer: UIButton) {
        tapAction?.action(recognizer)
    }


    func mk_addTapHandler(action: @escaping (UIButton) -> Void) {
        self.addTarget(self, action: #selector(handleAction(_:)), for: .touchUpInside)
        tapAction = Action(action: action)

    }
}

Answer 4

在 Swift 4 中，只需使用這個：

func buttonTapped(_ sender: UIButton) {

    let buttonPostion = sender.convert(sender.bounds.origin, to: tableView)

    if let indexPath = tableView.indexPathForRow(at: buttonPostion) {
        let rowIndex =  indexPath.row
    }
}

Answer 5

嘗試這個：

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = (tableView.dequeueReusableCell(withIdentifier: "MainViewCell", forIndexPath: indexPath) as! MainTableViewCell)
    cell.myButton().addTarget(self, action: Selector("myClickEvent:event:"), forControlEvents: .touchUpInside)
    return cell
}

此函數獲取行點擊的位置

@IBAction func myClickEvent(_ sender: Any, event: Any) {
    var touches = event.allTouches()!
    var touch = touches.first!
    var currentTouchPosition = touch.location(inView: feedsList)
    var indexPath = feedsList.indexPathForRow(atPoint: currentTouchPosition)!
    print("position:\(indexPath.row)")
}

Answer 6

您還可以通過這種方式從CGPoint獲取NSIndexPath ：

@IBAction func closeImageButtonPressed(sender: AnyObject) {
    var buttonPosition = sender.convertPoint(CGPointZero, to: self.tableView)
    var indexPath = self.tableView.indexPathForRow(atPoint: buttonPosition)!
}

Answer 7

創建 UIButton 的自定義類並聲明這樣的存儲屬性，並使用它從 callFroRowAtIndexPath 檢索分配的 indexPath。

class VUIButton: UIButton {
    var indexPath: NSIndexPath = NSIndexPath()
}

這是您的 indexPath 在任何情況下都不會出錯的完整證明解決方案。 嘗試一次。

Answer 8

在您的 cellForRow 中：

#import <objc/runtime.h>

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    setAssociatedObject(object: YOURBUTTON, key: KEYSTRING, value: indexPath)
}

@IBAction func closeImageButtonPressed(sender: AnyObject) {
    let val = getAssociatedObject(object: sender, key: KEYSTROKING)
}

這里 val 是您的 indexPath 對象，您可以傳遞任何對象，就像您可以分配傳遞單元格對象並在按鈕操作中獲取它一樣。

Answer 9

//
//  ViewController.swift
//  Table
//
//  Created by Ngugi Nduung'u on 24/08/2017.
//  Copyright © 2017 Ngugi Ndung'u. All rights reserved.
//

import UIKit

class ViewController: UITableViewController{

    let identifier = "cellId"
    var items = ["item1", "2", "3"]
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.title = "Table"
        tableView.register(MyClass.self, forCellReuseIdentifier: "cellId")
    }

    //Return number of cells you need
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
        return items.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! MyClass
        cell.controller = self
        cell.label.text  = items[indexPath.row]
        return cell

    }

    // Delete a cell when delete button on cell is clicked 
    func delete(cell: UITableViewCell){
        print("delete")
        if let deletePath = tableView.indexPath(for: cell){
            items.remove(at: deletePath.row)
            tableView.deleteRows(at: [deletePath], with: .automatic)
        }

    }

}

class MyClass : UITableViewCell{
    var controller : ViewController?
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
            super.init(style: style, reuseIdentifier: reuseIdentifier)
            setUpViews()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        fatalError("init(coder:) has not been implemented")
    }

    let label : UILabel = {
        let label = UILabel()
        label.text = "My very first cell"
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()

    let btn : UIButton = {
       let bt = UIButton(type: .system)
        bt.translatesAutoresizingMaskIntoConstraints = false
        bt.setTitle("Delete", for: .normal)


        bt.setTitleColor(.red, for: .normal)
        return bt
    }()

    func handleDelete(){
       controller?.delete(cell: self)
    }
    func setUpViews(){
        addSubview(label)
        addSubview(btn)
        btn.addTarget(self, action: #selector(MyClass.handleDelete), for: .touchUpInside)
        btn.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
        label.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 16).isActive = true
        label.widthAnchor.constraint(equalTo: self.widthAnchor , multiplier: 0.8).isActive = true
        label.rightAnchor.constraint(equalTo: btn.leftAnchor).isActive = true

    }
}

這是一個完整的示例，可以回答您的問題。

Answer 10

class MyCell: UICollectionViewCell {

   @IBOutlet weak var btnPlus: UIButton!

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> 
 UITableViewCell {


cell.btnPlus.addTarget(self, action: #selector(increment_Action(sender:)), 
 for: .touchUpInside)
cell.btnPlus.tag = indexPath.row
cell.btnPlus.superview?.tag = indexPath.section
}

@objc func increment_Action(sender: UIButton) {
        
let btn = sender as! UIButton
let section = btn.superview?.tag ?? 0

let row = sender.tag
}