Create MKPolyline with only recent CLLocations - ios

Question

My app loads the user's past polylines and displays them on the map. Then the app starts tracking and a straight line is drawn from the last updated coordinate to the first, thereby connecting the two separate lines when they should be separate (shown here
I want to remove this straight line, so I'm thinking the easiest way would be to discard coordinates that are outside a set time frame (e.g 1 minute), so polylines on the map remain separate. I'm not sure how to do this though... I'm a beginner so any suggestions would be much appreciated!
I use this code when loading the past polyline
(IBAction)didClickLoadCoordinates:(id)sender {
// get a reference to the appDelegate so you can access the global managedObjectContext
AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:#"Route"];
NSError *error;
id results = [appDelegate.managedObjectContext executeFetchRequest:request error:&error];
if ([results count]) {
polyLine = (Route *)(results[0]);
NSArray *coordinates = polyLine.coordinates;
int ct = 0;
for (CLLocation *loc in coordinates) {
NSLog(#"location %d: %#", ct++, loc);
}
// this copies the array to your mutableArray
_locationsArray = [coordinates mutableCopy];
}
NSInteger numberOfSteps = _locationsArray.count;
//convert to coordinates array to construct the polyline
CLLocationCoordinate2D clCoordinates[numberOfSteps];
for (NSInteger index = 0; index < numberOfSteps; index++) {
CLLocation *location = [_locationsArray objectAtIndex:index];
CLLocationCoordinate2D coordinate2 = location.coordinate;
clCoordinates[index] = coordinate2;
}
MKPolyline *routeLine = [MKPolyline polylineWithCoordinates:clCoordinates count:numberOfSteps];
[_mapView addOverlay:routeLine];
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
And this code to just normally update the cllocations and make the polyline
//get the latest location
CLLocation *currentLocation = [locations lastObject];
//get latest location coordinates
CLLocationDegrees latitude = currentLocation.coordinate.latitude;
CLLocationDegrees longitude = currentLocation.coordinate.longitude;
CLLocationCoordinate2D locationCoordinates = CLLocationCoordinate2DMake(latitude, longitude);
//zoom map to show users location
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(locationCoordinates, 2000, 2000);
MKCoordinateRegion adjustedRegion = [_mapView regionThatFits:viewRegion];
[_mapView setRegion:adjustedRegion animated:YES];
//store latest location in stored track array
[_locationsArray addObject:currentLocation];
//create cllocationcoordinates to use for construction of polyline
NSInteger numberOfSteps = _locationsArray.count;
CLLocationCoordinate2D coordinates[numberOfSteps];
for (NSInteger index = 0; index < numberOfSteps; index++) {
CLLocation *location = [_locationsArray objectAtIndex:index];
CLLocationCoordinate2D coordinate2 = location.coordinate;
coordinates[index] = coordinate2;
}
MKPolyline *routeLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps];
[_mapView addOverlay:routeLine];
NSLog(#"%#", _locationsArray);