Nov 052012
 

It is often useful to open an MKMapKit annotation in the native iOS Maps app. Here’s a function that will do this for you, and takes into account the recent changes with iOS 6.

// This function accepts an MKAnnotation and opens it in the native iOS Maps App
+(void)openInMapsWithAnnotation:(id<MKAnnotation>)annotation {
    Class itemClass = [MKMapItem class];

    // http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKMapItem_class/Reference/Reference.html
    if (itemClass && [itemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) {
        // ios6
        MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:annotation.coordinate addressDictionary:nil];
        MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
        [mapItem setName:[annotation title]];
        [MKMapItem openMapsWithItems:[NSArray arrayWithObject:mapItem] launchOptions:nil];        
    } else {
        // pre ios6
        NSString *base = @"maps:q=";
        CLLocationCoordinate2D location = annotation.coordinate;
        NSString *title = [[annotation title] stringByReplacingOccurrencesOfString:@" " withString:@"+"];
        NSString *urlString = [NSString stringWithFormat:@"%@%@@%f,%f", base, title, location.latitude, location.longitude];
        NSURL *url = [NSURL URLWithString:urlString];
        [[UIApplication sharedApplication] openURL:url];
    }
}

You can also find the Open MKAnnotation on GitHub code as a gist on GitHub, which you’re welcome to fork or do whatever else you want.

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