MKpolyline 无法正确显示给定坐标

Question

我正在尝试使用以下代码绘制 MKpolyline。

var points: [CLLocationCoordinate2D] = []

let locationDetails = myArray as! [Location]

for each in locationDetails{
    print("Latitude \(each.latitude) - Longitude \(each.longitude)")
    points.append(CLLocationCoordinate2DMake(each.latitude, each.longitude))
}

let centerLocation : Location = myArray.anyObject() as! Location
let centerPoint = CLLocationCoordinate2DMake(centerLocation.latitude, centerLocation.longitude);

print("POINTS \(points)")

let polyline = MKPolyline(coordinates: points, count: points.count)
mapView.add(polyline)

let region = MKCoordinateRegionMakeWithDistance(centerPoint, 5000.0, 7000.0)
mapView.setRegion(region, animated: true)

但我的折线越来越乱。请参阅随附的屏幕截图。首先我想到了坐标问题。但是当我用 this online tool 尝试那些纬度和经度时，它给了我完美的针脚线。 print 完美记录坐标。

坐标

6.8517432035942099,79.905121140256398
6.8475310038839003,79.902849560677893
6.8581436667655202,79.908119598477995
6.8374054133955697,79.893569033667305
6.8566833715949702,79.907449213862293
6.8406604416732097,79.898999668732202
6.83810886461925,79.892979702055399
6.8542092852358296,79.906306928098104
6.8402581522304899,79.895430151447599
6.8368830112804098,79.894324662238304
6.8440497480396596,79.900090321972897
6.8493188219208703,79.902743613421805
6.8484064936701703,79.902548063620799
6.85723423027141,79.908170560449307
6.8450230546359396,79.899919834062402
6.84973481577528,79.903571158721903
6.8459125422004998,79.899705760255401
6.8551684683252603,79.906455958336494
6.8414650205586502,79.901498481705701
6.8405259121273101,79.899981692507794
6.8513044109631798,79.904290326014106
6.8373792317329203,79.895165984713401
6.8372333821392299,79.895255911941504
6.8466924363811001,79.900271203443296
6.8506548972864199,79.903621031045802
6.8390314607013396,79.892975427284696
6.8469577236164803,79.901166977435295
6.83748895475187,79.895160402688802
6.8398749735270101,79.896293487474196
6.8407466076378203,79.893662072792594
6.8422778556187103,79.900998165905406
6.8398627359483797,79.893336938768499
6.8408240983326403,79.894646443501003
6.8560738395963403,79.906751504242294
6.8469752417941097,79.902100302353404
6.8374541960720299,79.895048104300997
6.8374381558016104,79.895128792781804
6.8524381890956798,79.905752716660402
6.8407501699466602,79.900907306074998
6.8401687173236496,79.897176772430399
6.8405627925012604,79.898056201711199
6.8430614378366998,79.900337923392598
6.8532910058338699,79.906087154597003

Answer 1

我已经使用 MKDirection 请求创建了折线

MKDirections *directions = [[MKDirections alloc] initWithRequest:directionsRequest];
[directions calculateDirectionsWithCompletionHandler:
 ^(MKDirectionsResponse *response, NSError *error) {
     if (error) {
         // Handle Error
     }
     else
     {
         //[self showRoute:response];
         for (MKRoute *route in response.routes)
         {
             [self.mapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
          }
     }

Answer 2

数据数组有问题。因为我从 coredata 获取坐标，所以这些坐标不按顺序。所以这就是为什么它没有一个接一个地画出完美的线条。一旦我对数组进行排序，我就完美地得到了它。 locationDetails = locationDetails.sorted(by: { [=10=].id < .id })

MKpolyline 无法正确显示给定坐标

MKpolyline not displaying correctly for given coordinates

mapkit

polyline

ios

swift

坐标