MKpolyline无法正确显示给定坐标

Question

我试图使用以下代码绘制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)

但我变得凌乱的折线。见附件截图。首先我认为坐标问题。但是当我用this online tool尝试那些纬线和长线时，它给了我完美的针脚线。 print完美地记录了cooridnates。

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

我使用MKDirection Request来创建折线

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

这是数据阵列的问题。因为我从coredata获得坐标，这些都不合适。这就是为什么它没有一个接一个地画出完美的线条。一旦我对阵列进行了排序，我就完美了。   locationDetails = locationDetails.sorted(by: { $0.id < $1.id })