iOS - MKPlacemark set title issue - ios

Question

I'm having issues setting the title and subtitle of my placemark.
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:location
completionHandler:^(NSArray* placemarks, NSError* error){
if (placemarks && placemarks.count > 0) {
CLPlacemark *topResult = [placemarks objectAtIndex:0];
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
placemark.title = #"Some Title";
placemark.subtitle = #"Some subtitle";
MKCoordinateRegion region = self.mapView.region;
region.center = placemark.region.center;
region.span.longitudeDelta /= 8.0;
region.span.latitudeDelta /= 8.0;
[self.mapView setRegion:region animated:YES];
[self.mapView addAnnotation:placemark];
}
}
];
placemark.title = #"Some Title"; and placemark.subtitle = #"Some subtitle";
give me an error of:
Assigning to property with 'readonly' attribute not allowed
Why can I not set the Title and Subtitle here?

Answer 1

Thought I'd wake this thread up and give you a solution that I came up with.
As far as I'm aware, MKPlacemark's title/subtitle are readonly properties due to inherent assignment. However, with the solution I found, you can simply pass your MKPlacemark into an MKPointAnnotation as follows:
CLPlacemark *topResult = [placemarks objectAtIndex:0];
// Create an MLPlacemark
MKPlacemark *placemark = [[MKPlacemark alloc] initWithPlacemark:topResult];
// Create an editable PointAnnotation, using placemark's coordinates, and set your own title/subtitle
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
point.coordinate = placemark.coordinate;
point.title = #"Sample Location";
point.subtitle = #"Sample Subtitle";
// Set your region using placemark (not point)
MKCoordinateRegion region = self.mapView.region;
region.center = placemark.region.center;
region.span.longitudeDelta /= 8.0;
region.span.latitudeDelta /= 8.0;
// Add point (not placemark) to the mapView
[self.mapView setRegion:region animated:YES];
[self.mapView addAnnotation:point];
// Select the PointAnnotation programatically
[self.mapView selectAnnotation:point animated:NO];
Please note that the final [self.mapView selectAnnotation:point animated:NO]; is a workaround to allow automatic popping-up of the placemark. However, the animated:BOOL portion only seems to work with NO in iOS5 - You might want to implement a workaround if you experience issues manually popping up the point-annotation, which can be found here:
MKAnnotation not getting selected in iOS5
I'm sure you've already found your own solution by now, but I hope this is, in some way, informative.