Question

我有一个自定义UITableViewCell，其功能可以向右滑动。滑动手势基于x轴的平移，因此，当x的平移超过40点时，我想触发一个segue。

我认为这是使用委托传递有关当前X值的数据的理想场所。所以，我创建了一个protocol函数didSwipeCell()，但我不确定如何将当前x值传递给UITableView。

请告诉我怎么做，如果您需要任何额外的信息，请在评论中告诉我而不是低估。

Answer 1

添加x值作为didSwipeCell（）方法的参数

protocol TableViewCellDelegate {
    func didSwipeCell(on xValue: Float)
}

将委托实例添加到您的单元格

class TableViewCell: UITableViewCell {
    weak var delegate: TableViewCellDelegate?
}

然后，当用户滑动提供xValue

的单元格时调用该方法

delegate?.didSwipeCell(on: xValue)

在你的UITableView实现TableViewCellDelegate方法。

 class TableView: UITableView, TableViewCellDelegate {
     func didSwipeCell(on xValue: Float) {
         //here you can get the xValue
     }

并且，不要忘记在cellForRowAtIndexPath方法中设置TableViewCell的委托

cell.delegate = self

Answer 2

您只需从 UItableViewCell 类到 UIViewController 即可获得x的值。声明关闭

export class MapComponent implements AfterViewInit {

  constructor(private _sanitizer: DomSanitizer){}

  private _popUpContent: string = '"Facility" + "<br/>" + "<a routerLink='/view2'>" + "View Two" + "</a>"';

  private htmlProperty(): SafeHtml {
     return this._sanitizer.bypassSecurityTrustHtml(this._popUpContent);
  }

  ngAfterViewInit() {
    let safeLink = this.htmlProperty();

    let openmap = L.tileLayer("http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{z}/{y}/{x}", {
      attribution: 'terms and feedback'
    });

    let map = L.map("map", {
      center: [33.2148, -97.1331],
      zoom: 5,
      zoomControl: true,
      maxZoom: 18 
    }).addLayer(openmap);

    let marker = L.marker([39.2148, -98.1331]).addTo(map);

    let popup = L.popup();

    function onMapClick(e) {
      popup
        .setLatLng(e.latlng)
        .setContent(safeLink) //throws type error
        .openOn(map);
    }

    map.on('click', onMapClick);
  }
}

在 UItableViewCell 类中，并将其实现到 UIViewController 类中。

在ViewController中

var getValue: ((_ xValue: CGFloat)->())!

Answer 3

Here is another way to do it...

class SwipeTableViewCell: UITableViewCell {

    var didSwipeAction : ((CGFloat)->())?
    var startLocation = CGPoint.zero
    var theSwipeGR: UISwipeGestureRecognizer?

    func respondToSwipeGesture(_ sender: UIGestureRecognizer) {
        if let swipe = sender as? UISwipeGestureRecognizer {
            if (swipe.state == UIGestureRecognizerState.began) {
                startLocation = swipe.location(in: self.contentView);
            } else if (swipe.state == UIGestureRecognizerState.ended) {
                let stopLocation = swipe.location(in: self.contentView);
                let dx = stopLocation.x - startLocation.x;
                if dx > 40 {
                    // pass the ending X coordinate in the callback
                    didSwipeAction?(stopLocation.x)
                }
            }
        }
    }

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        myInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        myInit()
    }


    func myInit() -> Void {
        if theSwipeGR == nil {
            let g = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture(_:)))
            g.direction = UISwipeGestureRecognizerDirection.right
            self.contentView.addGestureRecognizer(g)
            theSwipeGR = g
        }
    }

}

and then your table view cell setup becomes:

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

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

    cell.didSwipeAction = {
        (xValue) in
        print("Simple", indexPath, "X =", xValue)
        // call performSegue() or do something else...
    }

    return cell
}

将当前UITableViewCell滑动传递给父UITableView

3 个答案: