将地图坐标数组传递给快速在地图上绘制路线答案

【问题标题】：pass array of map coordinates to a draw a route on map in swift将地图坐标数组传递给快速在地图上绘制路线
【发布时间】：2021-02-13 17:29:43
【问题描述】：

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

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。

原始数据类型如下所示：

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我的绘制路线函数的点变量中。它目前使用一些虚拟数据进行硬编码。

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！

【问题讨论】：

标签： ios swift dictionary mapkit

【解决方案1】：

您可以使用map 转换您的坐标

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

这将转换所有同时具有纬度和经度的坐标对象。

你确定坐标中的属性可以为空吗，如果不是，上面可以简化为

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

【讨论】：

【解决方案2】：

根据 Joakim 的回答，我找到了完整的解决方案：

那么如何将一些坐标数据从屏幕 A（假设您有一个 tableView）传递到屏幕 B（您有地图）。

所以在屏幕A（viewControllerA）中：

你定义坐标变量（当然根据你的数据模型，通常应该是一个数组）

var coordinates = [Coordinates]()

然后在 UITableViewDelegate 扩展中，将坐标附加到坐标数组中。然后使用 prepare segue 将其传递给您的目标 viewController。

    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.coordinates.append(tripList[indexPath.section][indexPath.row].coordinates[i])
                }
                
       
                
                destinationVC.coordinatePoints = coordinates
                coordinates = []
                
                 
            }
        } else {
            if let destinationVC = segue.destination as? PolicyOverviewViewController,
                let indexPath = sender as? IndexPath {
                // do something
            }
        }

    }

在您的屏幕 B 中（您映射的位置）。您定义变量以捕获来自屏幕 A 的数据传递，即coordinatePoints

var coordinatePoints: [Coordinates]?

然后在您的绘制路线函数中（或您所称的任何名称）。您将这个 coordinatePoints 转换为 CLLocationCoordinate2D 类型，如下所示：

    func drawRoutes() {

        var points:[CLLocationCoordinate2D] = coordinatePoints?.compactMap {
            guard let latitude = $0.lat, let longitude = $0.lng else { return nil }
            return CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
            } ?? [CLLocationCoordinate2DMake(52.3676, 4.9041)]
                

        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]
            }
        }
    }

你去吧，当你点击屏幕 A 中的表格单元格时，它应该将正确的坐标传递到屏幕 B 并将其绘制在地图上。

【讨论】：