check current location is in MkPolygons - iphone

Question

I am working in an IOS 7 project ,it contains a location checking (current location is in given polygons).
I am Using the following code to check the condition
Created an array of MKPolygons
for(MKPolygon *poly in self.polygonArray)
{
[self checkTheLocationIsInPolygon:currentLocation polygon:poly];
}
- (void)checkTheLocationIsInPolygon:(CLLocation*)aLocation polygon:(MKPolygon*)aPolygon
{
CLLocationCoordinate2D coordinate = {aLocation.coordinate.latitude, aLocation.coordinate.longitude};
MKMapPoint mapPoint = MKMapPointForCoordinate(coordinate);
CGMutablePathRef mpr = CGPathCreateMutable();
MKMapPoint *polygonPoints = aPolygon.points;
size_t nCount = aPolygon.pointCount;
for (int p = 0; p < nCount; p++)
{
MKMapPoint mp = polygonPoints[p];
if (p == 0)
CGPathMoveToPoint(mpr, NULL, mp.x, mp.y);
else
CGPathAddLineToPoint(mpr, NULL, mp.x, mp.y);
}
CGPoint mapPointAsCGP = CGPointMake(mapPoint.x, mapPoint.y);
BOOL pointIsInPolygon = CGPathContainsPoint(mpr, NULL, mapPointAsCGP, FALSE);
CGPathRelease(mpr);
if(pointIsInPolygon == YES)
{
//IN
}
else
{
//Out
}
}
This code is working correctly(pointIsInPolygon return YES/NO correctly) for the first polygon .Then the next iteration (Next polygon from array) pointIsInPolygon gives the previous state means, it return NO if the first polygon was outside the location and it return YES if the first polygon was inside the location .
How to fix this issue?
If anybody know, please give me a suggestion

Answer 1

Swift is simple, you need to do the following, attention in the example is not implemented MKPolygon Array for mutiple MKPolygon on a map
// Init array for any MKPolygons
var arrayMKPolygon : NSMutableArray = []
override func viewWillAppear(animated: Bool) {
// Add one or more than one
self.setMKPolygon()
let tapGesture = UITapGestureRecognizer(target: self, action: "revealRegionDetailsWithPressOnMap:")
tapGesture.numberOfTapsRequired = 1
tapGesture.numberOfTouchesRequired = 1
self.mapView.addGestureRecognizer(tapGesture)
}
func setMKPolygon(){
// Poinst for polygon -> (or NSArray)
for() {
----> (dynamic for example web service) var points = [CLLocationCoordinate2DMake(41.000512, -109.050116),
CLLocationCoordinate2DMake(41.002371, -102.052066),
CLLocationCoordinate2DMake(36.993076, -102.041981),
CLLocationCoordinate2DMake(36.99892, -109.045267)]
// Polygon
let poly: MKPolygon = MKPolygon(coordinates: &points, count: 4)
// Add polygon
mapView.addOverlay(poly)
// Add objecto to Array
arrayMKPolygon.addObject(poly)
}
}
func revealRegionDetailsWithPressOnMap(sender: UITapGestureRecognizer) {
let touchLocation = sender.locationInView(self.mapView)
let locationCoordinate = self.mapView.convertPoint(touchLocation, toCoordinateFromView: self.mapView)
print("Tapped at lat: \(locationCoordinate.latitude) long: \(locationCoordinate.longitude)")
for i in 0...arrayMKPolygon.count - 1 {
let polygonView = MKPolygonRenderer(overlay: arrayMKPolygon[i] as! MKOverlay)
let mapPoint = MKMapPointForCoordinate(locationCoordinate)
let circlePoint = polygonView.pointForMapPoint(mapPoint)
let mapCoordinateIsInCircle : Bool = CGPathContainsPoint(polygonView.path, nil, circlePoint, false)
if mapCoordinateIsInCircle{
print("Yes, is within index --> \(i)")
}
else{
print("NO")
}
}
}
func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer {
if overlay is MKPolygon {
let polygonView = MKPolygonRenderer(overlay: overlay)
polygonView.strokeColor = UIColor.magentaColor()
polygonView.fillColor = UIColor.yellowColor().colorWithAlphaComponent(0.15)
polygonView.lineWidth = 1.5;
return polygonView
}
return MKPolygonRenderer(overlay: overlay)
}