CLLocation 获取 EXC_BAD_ACCESS

Question

我在尝试访问 CLLocation 时遇到错误，您能解释一下原因吗？

CLLocation *currentLocation;
@property (nonatomic, retain) CLLocation *currentLocation;

我从位置经理处收到有关该位置的反馈：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    if (newLocation != nil) {
        currentLocation = newLocation;
        NSLog(@"locationManager: %@", currentLocation);
    }
}

位置经理：<+36.45307493， +28.22220462> +/- 100.00m（速度 -1.00 mps/航向 -1.00）@ 9/2/11 10:14:58 π.μ。 GMT+02:00

但是当我尝试从 DidSelectAnnotationView 访问 currentLocation 时，我得到 EXC_BAD_ACCESS：

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {

    NSLog(@"current Location: %@", currentLocation);

}

您能解释一下为什么我无法访问它吗？

非常感谢！

Answer 1

您不会保留该位置。这样做：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    if (newLocation != nil) {
        self.currentLocation = newLocation; /// The change is here
        NSLog(@"locationManager: %@", currentLocation);
    }
}