快速传递地图坐标数组以在地图上绘制路线 [英] pass array of map coordinates to a draw a route on map in swift

问题描述

我有一个这样的坐标数据数组，它是从API调用中检索的，并且我使用了for循环将数据附加到这样的数组中:

hi I have an array of coordinates data like this, which is retrieved from an API call, and I use a for loop to append the data into an array like this:

extension TripListViewController: UITableViewDelegate {


    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        
        performSegue(withIdentifier: Constants.segueTripListToTripMap, sender: indexPath)

        tableView.deselectRow(at: indexPath, animated: true)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if segue.identifier == Constants.segueTripListToTripMap {
            if let destinationVC = segue.destination as? TripMapViewController,
                let indexPath = sender as? IndexPath {
                
                
                for i in 0...(tripList[indexPath.section][indexPath.row].coordinates.count-1) {
                    self.coodinates.append(tripList[indexPath.section][indexPath.row].coordinates[i])
                }
                
                destinationVC.coodinatePoints = coodinates
                
                
                 
            }
        } else {
            if let destinationVC = segue.destination as? PolicyOverviewViewController,
                let indexPath = sender as? IndexPath {
                // do something
            }
        }

    }

}

它有一个错误...我不知道如何将此数组传递给我在另一个屏幕中声明的变量，数据类型似乎不匹配.

it has an error... I don't know how to pass this array to the variable I declared in another screen, the data type seem doesn't match.

原始数据类型如下:

struct Trips: Codable {
    let id: String
    let userId: String
    let coordinates: [Coordinates]

}

struct Coordinates: Codable {
    let lat: Double?
    let lng: Double?
    let time: String?
}

[
["time": "timestampes"
"lat": 40.213
"lon": 5.203],
["time": "timestampes"
"lat": 40.213
"lon": 5.203],
["time": "timestampes"
"lat": 40.213
"lon": 5.203],
["time": "timestampes"
"lat": 40.213
"lon": 5.203]

]

如何将这些数据传递到绘制路径函数的point变量中.目前已使用一些伪数据对其进行了硬编码.

how can I pass this data into my draw route function's point variable. it's currently hardcoded with some dummy data.

func drawRoutes() {

        var points = [CLLocationCoordinate2DMake(51.079980, 4.349850),
                      CLLocationCoordinate2DMake(51.079060, 4.350830),
                      CLLocationCoordinate2DMake(51.078210, 4.350490),
                      CLLocationCoordinate2DMake(51.077750, 4.350890),
                      CLLocationCoordinate2DMake(51.076760, 4.354600),
                      CLLocationCoordinate2DMake(51.075130, 4.351000),
                      CLLocationCoordinate2DMake(51.073800, 4.350690),
                      CLLocationCoordinate2DMake(52.071850, 4.352880),
                      CLLocationCoordinate2DMake(52.069320, 4.355940),
                      CLLocationCoordinate2DMake(52.069120, 4.356130),
                      CLLocationCoordinate2DMake(52.069120, 4.356130),
                      CLLocationCoordinate2DMake(52.069120, 4.356130),
                      CLLocationCoordinate2DMake(52.068570, 4.356950),
                      CLLocationCoordinate2DMake(52.067840, 4.358440),
                      CLLocationCoordinate2DMake(52.066730, 4.357490),
                      CLLocationCoordinate2DMake(52.066590, 4.358680),
                      CLLocationCoordinate2DMake(52.066580, 4.358680),
                      CLLocationCoordinate2DMake(52.066580, 4.358680),
                      CLLocationCoordinate2DMake(52.066830, 4.357490),
                      CLLocationCoordinate2DMake(52.067600, 4.358520),
                      CLLocationCoordinate2DMake(52.068650, 4.356920),
                      CLLocationCoordinate2DMake(52.074330, 4.350360),
                      CLLocationCoordinate2DMake(52.075520, 4.351880),
                      CLLocationCoordinate2DMake(52.076950, 4.355350),
                      CLLocationCoordinate2DMake(52.078000, 4.350690),
                      CLLocationCoordinate2DMake(52.078010, 4.350710),
                      CLLocationCoordinate2DMake(52.079520, 4.351560),
                      CLLocationCoordinate2DMake(52.080680, 4.350220),
                      CLLocationCoordinate2DMake(52.080760, 4.348890),
                      CLLocationCoordinate2DMake(52.079890, 4.349980),
                      CLLocationCoordinate2DMake(52.079890, 4.350000)]

        let polygon = MKPolyline(coordinates: &points, count: points.count)

        self.mapView.addOverlay(polygon)
        self.mapView.setVisibleMapRect(polygon.boundingMapRect, animated: true)

        var startPoint = points[0]
        
        for i in 1...(points.count-1) {
            
            guard let request = createRequest(c1:startPoint, c2:points[i]) else { return }
            let directions = MKDirections(request: request)

            directions.calculate { [unowned self] (response, error) in
                guard let response = response else { return }
                let routes = response.routes
                let bestDest = routes[0]
                startPoint = points[i]
            }
        }
    }

非常感谢！

推荐答案

您可以使用 map 转换坐标

let points: [CLLocationCoordinate2D] = coordinates.compactMap {
    guard let latitude = $0.lat, let longitude = $0.lng else { return nil }
    return CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
}

这将转换所有具有给定纬度和经度的坐标对象.

This will convert all Coordinates objects that has both a latitude and a longitude given.

您确定坐标中的属性可以为null，否则可以简化为

Are you sure the properties can be null in Coordinates, if not the above can be simplified to

let points: [CLLocationCoordinate2D] = coordinates.map {
    CLLocationCoordinate2D(latitude: $0.lat, longitude: $0.lng)
}

这篇关于快速传递地图坐标数组以在地图上绘制路线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！