我试图在自定义表格单元格内单击按钮时将标签值增加1。我能够在不同的单元格中以不同的方式更改值，但是问题是，如果我在第一个单元格标签中点按+从0更改为1，当我在第二个单元格标签中点按+直接从0更改为2，以此类推。我该如何解决？
<html>
<head>
<title>Leaflet geolocate example</title>
<link href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css" rel="stylesheet" />
<link href="https://unpkg.com/leaflet.markercluster@1.4.1/dist/MarkerCluster.Default.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://unpkg.com/leaflet.gridlayer.googlemutant@latest/Leaflet.GoogleMutant.js"></script>
<script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js"></script>
<script src="https://unpkg.com/leaflet.markercluster@1.4.1/dist/leaflet.markercluster-src.js"></script>
<script language="javascript">
var map;
var markers = [];
function init() {
var map = new L.Map('test_map', {
fullscreenControl: {
pseudoFullscreen: false // if true, fullscreen to page width and height
},
}).setView([-40.99497, 174.50808], 10);
map.createPane('labels');
map.getPane('labels').style.zIndex = 650;
map.getPane('labels').style.pointerEvents = 'none';
var positron = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
noWrap: true,
maxZoom: 15
}).addTo(map);
var positronLabels = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_only_labels/{z}/{x}/{y}.png', {
pane: 'labels',
noWrap: true,
maxZoom: 3
}).addTo(map);
var southWest = L.latLng(-89.98155760646617, -180),
northEast = L.latLng(89.99346179538875, 180),
bounds = L.latLngBounds(southWest, northEast);
map.setMaxBounds(bounds);
map.on('drag', function () {
map.panInsideBounds(bounds, { animate: false });
});
var plot = [
["7C6B07", -40.99497, 174.50808],
["7C6B38", -41.30269, 173.63696],
["7C6CA1", -41.49413, 173.5421],
["7C6CA2", -40.98585, 174.50659],
["C81D9D", -40.93163, 173.81726],
["C82009", -41.5183, 174.78081],
["C82081", -41.42079, 173.5783],
["C820AB", -42.08414, 173.96632],
["C820AB", -42.08414, 173.96632]
];
var markercluster = new L.MarkerClusterGroup();
for (var i = 0; i < plot.length; i++) {
marker = new L.marker([plot[i][1], plot[i][2]]).bindPopup(plot[i][0], { autoClose: false }).addTo(map).openPopup();
markers.push(marker);
markercluster.addLayer(marker);
}
markercluster.on('clusterclick', function (a) { alert('Cluster Clicked'); });
map.addLayer(markercluster);
}
</script>
</head>
<body onLoad="javascript:init();">
<div id="test_map" style="height: 500px"></div>
</body>
</html>答案 0 :(得分：3)
有两种方法可以实现这一目标：
1。。使Array级别的controller中每个单元格的计数保持不变，每次按button，从数组中获取计数并使用它，即
var counts = [Int](repeating: 0, count: 10) //10 is the number of cells here
@IBAction func addPressed(_ sender: UIButton) {
let indexPath = IndexPath(row: sender.tag, section: 0)
let cell = tblview.cellForRow(at: indexPath) as! HomeDetailsTableViewCell
counts[indexPath.row] += 1
cell.lblNoOfItems.text = "\(counts[indexPath.row])"
}
2。。将每个单元格的计数保留在自定义单元格本身中，即保存在HomeDetailsTableViewCell中，即
class HomeDetailsTableViewCell: UITableViewCell {
var count = 0
//Rest of the code...
}
@IBAction func addPressed(_ sender: UIButton) {
let indexPath = IndexPath(row: sender.tag, section: 0)
let cell = tblview.cellForRow(at: indexPath) as! HomeDetailsTableViewCell
cell.count += 1
cell.lblNoOfItems.text = "\(cell.count)"
}
此外，实现添加+ button的代码的方式也不正确。您必须在HomeDetailsTableViewCell本身内实现它，即
class HomeDetailsTableViewCell: UITableViewCell {
@IBOutlet weak var lblNoOfItems: UILabel!
var count = 0
@IBAction func addPressed(_ sender: UIButton) {
self.count += 1
self.lblNoOfItems.text = "\(self.count)"
}
//Rest of the code...
}
答案 1 :(得分：0)
这是因为您要对类中的所有单元格使用全局变量，如果您希望对每个单元格保持不同的计数，则必须为每个单元格使用不同的变量，我只是给您指示，以便您找到自己的路线。
创建一个用于计数的数据源，并使用与表所用的数据源相同的数据源进行初始化，例如，假设您的tableview数据源有一个字符串数组，则可以创建包含标题和计数的列表数组。我为您提供了解决方案中的所有步骤，您只需要将代码放在正确的位置即可：-
//Suppose this is your tableivew data source
let list : [String] = ["Title1","Title2","Title3"]
//Make a dictionary that is going to be your datasource of tableview holding the count too
var listDict : [[String:Any]] = []
for item in list{
let dict : [String:Any] = ["title":item,"count":Int(0)]
listDict.append(dict)
}
//Where you are performing the actions like in didSelectRow or in any button
let cellIndexPath : IndexPath = IndexPath(item: 0, section: 0) // Get the indexPath of Cell
//Update the count
if let count = listDict[cellIndexPath.row]["count"] as? Int{
let newValue = count + 1
listDict[cellIndexPath.row]["count"] = newValue
}
//Reload the tableview cell of update manually your choice I'm reloading the cell for short
let tableview = UITableView()
tableview.reloadRows(at: [cellIndexPath], with: .fade)
答案 2 :(得分：0)
您可以使用 Swift 5
中的以下代码获取此问题的答案//第一步
TableViewCell
内部import UIKit
@objc protocol CellDelagate : NSObjectProtocol {
func addPressed(_ cell: TableViewCell)
}
class TableViewCell: UITableViewCell {
var cellDelagate: CellDelagate?
var indexPath : IndexPath?
@IBOutlet weak var gPaybutton: UIButton!
@IBOutlet weak var proceesingLabel: UILabel!
var count = 0
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
@IBAction func proccessingButtonTapped(_ sender: UIButton) {
self.cellDelagate!.addPressed(self)
if gPaybutton.tag == indexPath?.row {
}
}
}
//第二步
ViewController
内部class ViewController: UIViewController {
@IBOutlet weak var tableview: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
extension ViewController: UITableViewDataSource, UITableViewDelegate, CellDelagate {
func addPressed(_ cell: TableViewCell) {
cell.count += 1
cell.proceesingLabel.text = "Processing : \(cell.count)"
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return yourArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell")! as? TableViewCell//1.
cell?.indexLabel?.text = yourArray[indexPath.row] //2.
cell?.cellDelagate = self //3.
cell?.tag = indexPath.row //4.
return cell! //5.
}
}