CODEWITHSUNDEEP
objective-c
skayred
skayred

Reputation: 10713

Cannot read class members values in Objective C

I'm trying to learn Objective C with examples, and now I stuck with the following problem. I have a code:

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

@interface ViewController :  UIViewController <MKMapViewDelegate> {
IBOutlet MKMapView *mapView;

MKPointAnnotation* startPoint;
MKPointAnnotation* endPoint;

double startPointLat;
double startPointLon;
double endPointLat;
double endPointLon;
}
@property (strong, nonatomic) IBOutlet MKMapView *mapView;
- (IBAction)findPressed:(id)sender;

@end

And implementation:

- (void)viewDidLoad
{
[super viewDidLoad];
self.mapView.delegate = self;

// Add an annotation
startPoint = [[MKPointAnnotation alloc] init];
startPoint.coordinate = CLLocationCoordinate2DMake(0, 0);
startPoint.title = @"Start point";

endPoint = [[MKPointAnnotation alloc] init];
endPoint.coordinate = CLLocationCoordinate2DMake(10, 10);
endPoint.title = @"End point";

startPointLat = 0;
startPointLon = 0;
endPointLat = 10;
endPointLon = 10;

[self.mapView addAnnotation:startPoint];
[self.mapView addAnnotation:endPoint];

NSLog(@"%@, %@ -> %@, %@", startPointLat, self->startPointLon, self->endPointLat, self->endPointLon);
}

But values in logs output are nulls. What's wrong?

Upvotes: 0

Views: 46

Answers (1)

Chuck
Chuck

Reputation: 237010

The format specifier "%@" is for objects, but the variables here are doubles. You want "%f" instead.

Upvotes: 5

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