苹果地图不显示地图覆盖
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【中文标题】苹果地图不显示地图覆盖【英文标题】：Apple Maps Not Showing Map Overlay 【发布时间】：2018-10-11 21:32:40 【问题描述】：我有一个关于创建 Apple Map Overlay 的问题。我正在尝试从 JSON 文件中设置奇怪的形状覆盖。我在 Stack Overflow 上对此进行了研究，并尝试了许多解决方案，但似乎都没有奏效。我的代码如下：
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, UIGestureRecognizerDelegate
@IBOutlet weak var mapView: MKMapView!
var coordinate: CLLocationCoordinate2D?
override func viewDidLoad()
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
mapView.showsUserLocation = true
mapView.delegate = self
mapView.mapType = .standard
let gestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.TapGesture))
mapView.addGestureRecognizer(gestureRecognizer)
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer
if overlay is MKPolygon
let polygonView = MKPolygonRenderer(overlay: overlay)
polygonView.strokeColor = UIColor.black
polygonView.lineWidth = 0.5
polygonView.fillColor = UIColor.blue
return polygonView
return MKOverlayRenderer()
@objc func TapGesture(gesRect: UITapGestureRecognizer)
let location = gesRect.location(in: mapView)
coordinate = mapView.convert(location,toCoordinateFrom: mapView)
let locCoord = mapView.convert(location, toCoordinateFrom: mapView)
print("Tapped at lat: \(locCoord.latitude) long: \(locCoord.longitude)")
print("Tapped at: \(location)")
self.retreiveShape() (full_shape) in
if let shape = full_shape
let polygon = MKPolygon.init(coordinates: shape, count: shape.count)
self.mapView.addOverlay(polygon)
else
print("ARRAY EMPTY")
func retreiveShape(completion: @escaping ([CLLocationCoordinate2D]?) -> ())
let path = Bundle.main.path(forResource: "shape", ofType: "json")
var coord_array = [CLLocationCoordinate2D]()
do
let data = try Data.init(contentsOf: URL.init(fileURLWithPath: path!))
let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
if let dictionary = json as? [String: Any]
if let shape = dictionary["shape"] as? Array<Any>
for regions in shape
guard let region = regions as? Array<Array<Array<Double>>> else
print("NOT HAPPENING")
return
for sections in region
for coord in sections
print("LATITUDE: \(coord[0])", "LONGITUDE: \(coord[1])")
let coordinatesToAppend = CLLocationCoordinate2D(latitude: coord[0], longitude: coord[1])
coord_array.append(coordinatesToAppend)
completion(coord_array)
catch let error
print(error)
shape.json 文件如下：
"shape":[
[
[
[-81.621199, 30.282314],
[-81.613987, 30.281941],
[-81.611277, 30.284743],
[-81.602735, 30.284026],
[-81.601978, 30.292561],
[-81.596275, 30.290861],
[-81.592406, 30.290182],
[-81.571146, 30.28763],
[-81.55922, 30.286602],
[-81.559148, 30.291132],
[-81.558633, 30.294747],
[-81.55881, 30.312887],
[-81.558601, 30.312888],
[-81.558622, 30.316235],
[-81.558313, 30.316828],
[-81.552252, 30.320252],
[-81.548471, 30.321618],
[-81.527882, 30.323989],
[-81.529486, 30.328076],
[-81.537635, 30.336704],
[-81.537706, 30.337221],
[-81.538717, 30.338277],
[-81.539343, 30.338462],
[-81.542809, 30.341686],
[-81.547286, 30.345211],
[-81.552498, 30.348839],
[-81.552559, 30.352445],
[-81.577566, 30.352039],
[-81.578098, 30.353324],
[-81.578161, 30.35642],
[-81.577294, 30.3596],
[-81.576996, 30.366609],
[-81.58011, 30.366553],
[-81.580875, 30.37062],
[-81.580844, 30.373862],
[-81.581462, 30.374486],
[-81.578114, 30.374236],
[-81.572908, 30.374611],
[-81.562232, 30.372303],
[-81.551965, 30.366559],
[-81.548676, 30.365568],
[-81.540187, 30.378172],
[-81.538175, 30.380467],
[-81.538213, 30.387239],
[-81.536613, 30.388739],
[-81.512612, 30.392739],
[-81.505211, 30.390739],
[-81.490911, 30.392139],
[-81.49085, 30.389014],
[-81.489978, 30.389207],
[-81.488818, 30.38775],
[-81.489203, 30.389266],
[-81.487056, 30.390019],
[-81.481446, 30.391262],
[-81.479505, 30.39117],
[-81.477708, 30.390635],
[-81.476792, 30.390609],
[-81.476244, 30.391002],
[-81.473212, 30.389422],
[-81.472125, 30.388436],
[-81.472225, 30.388071],
[-81.474072, 30.386758],
[-81.475085, 30.384287],
[-81.474394, 30.381898],
[-81.473246, 30.38059],
[-81.473337, 30.380112],
[-81.47295, 30.379864],
[-81.472643, 30.380053],
[-81.471914, 30.379532],
[-81.471629, 30.378346],
[-81.470845, 30.377256],
[-81.468671, 30.376016],
[-81.466871, 30.374481],
[-81.465402, 30.374424],
[-81.464374, 30.373764],
[-81.465116, 30.373015],
[-81.467728, 30.372493],
[-81.469102, 30.371435],
[-81.470279, 30.369931],
[-81.472008, 30.370608],
[-81.473695, 30.370041],
[-81.471862, 30.370238],
[-81.470952, 30.369737],
[-81.471715, 30.369462],
[-81.470506, 30.369378],
[-81.469456, 30.368207],
[-81.468051, 30.367707],
[-81.46754, 30.366828],
[-81.466905, 30.366464],
[-81.467432, 30.366219],
[-81.466928, 30.365735],
[-81.465222, 30.365136],
[-81.464909, 30.364103],
[-81.46316, 30.362764],
[-81.463369, 30.36188],
[-81.462197, 30.361235],
[-81.461151, 30.36123],
[-81.46117, 30.360531],
[-81.461878, 30.360305],
[-81.461619, 30.359642],
[-81.461873, 30.358669],
[-81.461645, 30.358376],
[-81.460504, 30.358329],
[-81.46288, 30.357969],
[-81.462786, 30.357137],
[-81.461247, 30.355282],
[-81.460556, 30.352518],
[-81.46184, 30.340222],
[-81.462497, 30.339325],
[-81.465064, 30.337897],
[-81.471588, 30.328301],
[-81.472988, 30.318258],
[-81.469123, 30.319481],
[-81.450496, 30.320896],
[-81.443818, 30.302908],
[-81.442451, 30.301512],
[-81.438991, 30.299798],
[-81.437921, 30.298031],
[-81.437696, 30.284657],
[-81.438134, 30.283427],
[-81.439935, 30.281191],
[-81.440578, 30.279729],
[-81.440309, 30.276152],
[-81.441217, 30.271746],
[-81.440891, 30.270368],
[-81.440247, 30.269313],
[-81.438555, 30.267721],
[-81.43765, 30.266188],
[-81.43705, 30.257116],
[-81.441869, 30.256519],
[-81.45385, 30.252008],
[-81.466184, 30.251073],
[-81.472173, 30.251296],
[-81.491372, 30.251034],
[-81.507105, 30.253603],
[-81.510744, 30.253761],
[-81.530261, 30.250144],
[-81.56957, 30.249854],
[-81.584658, 30.251369],
[-81.586895, 30.251326],
[-81.589607, 30.250593],
[-81.593308, 30.248471],
[-81.605497, 30.260294],
[-81.621493, 30.282334],
[-81.621199, 30.282314]
]
]
]
它应该在佛罗里达州杰克逊维尔的南部创建一个奇怪的形状叠加层，但事实并非如此。当调用完成块时，坐标被添加到数组中，但地图叠加层没有显示。有什么想法吗？
【问题讨论】：
相同的代码是否适用于更简单（可能更短）的顶点列表？如果是这样，您可以开始添加点，直到它停止工作，这可能会让您知道问题出在哪里。 【参考方案1】：这有点尴尬。我按照 cmets 中的建议进行了操作，并尝试使用具有九个顶点的形状。它仍然没有工作。然后我改变了坐标：
print("LATITUDE: \(coord[0])", "LONGITUDE: \(coord[1])")
let coordinatesToAppend = CLLocationCoordinate2D(latitude: coord[0], longitude: coord[1])
到：
print("LATITUDE: \(coord[1])", "LONGITUDE: \(coord[0])")
let coordinatesToAppend = CLLocationCoordinate2D(latitude: coord[1], longitude: coord[0])
完美运行。原来我的纬度和经度错了。
【讨论】：
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