I am still finding my feet with objective-c and was wondering if its acceptable to use @property on the two objects below.

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface MapViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate> {
    CLLocationManager *locationManager;
    IBOutlet MKMapView *googleMapView;
}
@property(nonatomic, retain) CLLocationManager *locationManager;
@property(nonatomic, retain) MKMapView *googleMapView;
@end

One of my reasons for using them is so that I can use the setters in my viewDidUnload, I seem to be using @property a lot and was just wondering if the use in this situation is acceptable?

-(void)viewDidUnload {
    [self setLocationManager:nil];
    [self setGoogleMapView:nil];
    [super viewDidUnload];
}

much appreciated

Gary