mapkit

Positioning MKMapView to show multiple annotations at once

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The link posted by Jim is now dead, but I was able to find the code (which I had bookmarked somewhere). – (void)zoomToFitMapAnnotations:(MKMapView *)mapView { if ([mapView.annotations count] == 0) return; CLLocationCoordinate2D topLeftCoord; topLeftCoord.latitude = -90; topLeftCoord.longitude = 180; CLLocationCoordinate2D bottomRightCoord; bottomRightCoord.latitude = 90; bottomRightCoord.longitude = -180; for(id<MKAnnotation> annotation in mapView.annotations) { topLeftCoord.longitude = fmin(topLeftCoord.longitude, … Read more

Setting the zoom level for a MKMapView

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I found myself a solution, which is very simple and does the trick. Use MKCoordinateRegionMakeWithDistance in order to set the distance in meters vertically and horizontally to get the desired zoom. And then of course when you update your location you’ll get the right coordinates, or you can specify it directly in the CLLocationCoordinate2D at … Read more

Programmatically open Maps app in iOS 6

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Here’s the official Apple way: // Check for iOS 6 Class mapItemClass = [MKMapItem class]; if (mapItemClass && [mapItemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) { // Create an MKMapItem to pass to the Maps app CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(16.775, -3.009); MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordinate addressDictionary:nil]; MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark]; [mapItem setName:@”My Place”]; // Pass the … Read more

How to pass prepareForSegue: an object

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Simply grab a reference to the target view controller in prepareForSegue: method and pass any objects you need to there. Here’s an example… – (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { // Make sure your segue name in storyboard is the same as this line if ([[segue identifier] isEqualToString:@”YOUR_SEGUE_NAME_HERE”]) { // Get reference to the destination view controller … Read more