Question

代码：

TreeScreenVC:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let entityHarvest = arrHarvest[indexPath.row]
            if entityHarvest.selfieDate != nil {
                var cell: TreePlantScreenCell3 = (tableView.dequeueReusableCell(withIdentifier: "cell1") as! TreePlantScreenCell3?)!
                    let loc = CLLocationCoordinate2DMake(entityHarvest.digLat , entityHarvest.digLong )
                    let span = MKCoordinateSpanMake(1.02,1.02)
                    let region =  MKCoordinateRegionMake(loc, span)
                    cell.mapView.setRegion(region, animated: true)

                    let lat = entityHarvest.digLat as Double
                    let long = entityHarvest.digLong as Double

                    let loc1 = CLLocation(latitude:lat, longitude:long)
                    cell.showLocation(location: loc1)

                    return cell
                }
}

CustomCell:

class TreePlantScreenCell3: UITableViewCell,MKMapViewDelegate {

 override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code

        mapView!.showsPointsOfInterest = true
        if let mapView = self.mapView {
            mapView.delegate = self
        }
    }

    //MARK: mapview delegate methods

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?{
        if (annotation is MKUserLocation) {
            return nil
        }

        let reuseId = "test"

        var anView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId)
        if anView == nil {

            anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            anView?.frame.size = CGSize(width: 20.0, height: 21.0)
            anView?.image = UIImage(named:"landmark.png")
            anView?.canShowCallout = true
        } else {
            anView?.annotation = annotation
        }
        return anView
    }

    func showLocation(location:CLLocation) {
        let orgLocation = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)

        let dropPin = MKPointAnnotation()
        dropPin.coordinate = orgLocation

        mapView!.addAnnotation(dropPin)

self.mapView?.setRegion(MKCoordinateRegionMakeWithDistance(orgLocation, 500, 500), animated: true)
    }

}

我在具有MKMapView的UITableView中创建了一个自定义单元格。当我使用每行的注释加载地图视图时，我的代码工作正常。但问题是当我滚动表视图时，每次加载地图视图并且滚动也不够平滑。让我知道如何解决这个问题。我分享了代码，帮助我找出代码中的错误。任何帮助将不胜感激。提前谢谢。

Answer 1

您可以使用MKMapSnapshotter顺畅滚动表格视图。

另见Swift 3 Add custom annotation pin to MKMapSnapShotter snapshot。

Answer 2

因为每次滚动都会使您的单元格出列。您可以只生成一次地图单元格，而不是这样，您可以在cellForRowAt方法中返回相同的对象。

customtableview单元格中的iOS swift mapview

2 个答案: