Created
January 8, 2015 14:35
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Calculate and draw multiple routes on a map
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- (IBAction)btnDirectionsPressed:(id)sender { | |
[self enableUI:NO]; // This method enables or disables all the UI elements that interact with the user | |
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0); // Create the semaphore | |
__block NSMutableArray *routes = [[NSMutableArray alloc] init]; // Arrays to store MKRoute objects and MKAnnotationPoint objects, so then we can draw them on the map | |
__block NSMutableArray *annotations = [[NSMutableArray alloc] init]; | |
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ | |
for (RouteObject *routeObject in _locations) { | |
MKDirectionsRequest *directionsRequest = [MKDirectionsRequest new]; | |
[directionsRequest setTransportType:MKDirectionsTransportTypeAutomobile]; | |
[directionsRequest setSource:[routeObject originMapItem]]; | |
[directionsRequest setDestination:[routeObject destinationMapItem]]; | |
[directionsRequest setRequestsAlternateRoutes:NO]; | |
MKDirections *direction = [[MKDirections alloc] initWithRequest:directionsRequest]; | |
// For each object in the locations array, we request that route from its origin and its destination | |
[direction calculateDirectionsWithCompletionHandler: ^(MKDirectionsResponse *response, NSError *error) { | |
if (error) { | |
NSLog(@"There was an error getting your directions"); | |
return; | |
} | |
MKRoute *route = [response.routes firstObject]; | |
[routes addObject:route]; | |
[annotations addObject:[routeObject destinationAnnotation]]; | |
dispatch_semaphore_signal(semaphore); // Send the signal that one semaphore is ready to consume | |
}]; | |
} | |
}); | |
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{ | |
for (int i = 0; i < _locations.count; i++) { | |
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER); // Wait until one semaphore is ready to consume | |
dispatch_async(dispatch_get_main_queue(), ^{ // For each element, dispatch to the main queue to draw route and annotation corresponding to that location | |
MKRoute *route = routes[i]; | |
[self.mapView addOverlay:route.polyline]; | |
[self.mapView addAnnotation:annotations[i]]; | |
}); | |
} | |
dispatch_async(dispatch_get_main_queue(), ^{ // Finally, dispatch to the main queue enabling elements and resizing map to show all the annotations | |
[self enableUI:YES]; | |
[self fitRegionToRoutes]; | |
}); | |
}); | |
} |
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code for RouteObject?