问题描述
嗨，我有一个这样的坐标数据数组，可以从API调用中检索它，并且我使用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...我不知道如何将该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：
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]
]
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。
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(52.068570,4.356950),CLLocationCoordinate2DMake(52.067840,4.358440),CLLocationCoordinate2DMake(52.066730,4.357490),CLLocationCoordinate2DMake(52.066590,4.358680),CLLocationCoordinate2DMake(52.066580,CLLocationCoordinate2DMake(52.066830,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,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),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！
解决方法
您可以使用map来转换坐标
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。
您确定坐标中的属性可以为null，否则可以简化为
let points: [CLLocationCoordinate2D] = coordinates.map {
CLLocationCoordinate2D(latitude: $0.lat,longitude: $0.lng)
}
根据Joakim的回答，我找到了完整的解决方案：
那么您要怎么做才能将一些坐标数据从屏幕A（例如您有tableView）传递到屏幕B（您有地图）。
因此在屏幕A（viewControllerA）中：
您定义坐标变量（当然，根据您的数据模型，通常应为数组）
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将其传递到目标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
}
}
}
在屏幕B中（您在地图上）。您定义变量以捕获来自屏幕A的数据传递，该变量为coordinatePoints
var coordinatePoints: [Coordinates]?
然后在绘制路线函数（或您称之为的任何名称）中。您可以将此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]
}
}
}
去那里，当您单击屏幕A中的表格单元格时，应将正确的坐标传递到屏幕B中并将其绘制在地图上。
