Question

This is the first time I am using a plist. I have been browsing around and I can’t find any other help.

I have the code below in my viewDidLoad. How come my annotations are not showing?

    mapView.showsUserLocation = YES;
mapView.delegate=self;


NSMutableArray *annotations = [[NSMutableArray alloc]init];
NSString *path = [[NSBundle mainBundle] pathForResource:@"StationAddress" ofType:@"plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];
NSArray *anns = [dict objectForKey:@"GasStation"];
NSLog(@" MapView is %@",mapView);
NSLog(@"anns is: %@", anns);


for(int i = 0; i < [anns count]; i++) {
    NSLog(@"read2");

    double realLatitude = [[[anns objectAtIndex:i] objectForKey:@"Latitude"] doubleValue];
    NSLog(@" double lat value is %f",realLatitude);
    double realLongitude = [[[anns objectAtIndex:i] objectForKey:@"Longitude"] doubleValue];
    NSLog(@" double lot value is %f",realLatitude);

    NSLog(@"read3");



    MyAnnotation *myAnnotation = [[MyAnnotation alloc] init];
    CLLocationCoordinate2D theCoordinate;
    theCoordinate.latitude = realLatitude;
    theCoordinate.longitude = realLongitude;
    myAnnotation.coordinate=CLLocationCoordinate2DMake(realLatitude,realLongitude);

    myAnnotation.title = [[anns objectAtIndex:i] objectForKey:@"Name"];
    myAnnotation.subtitle = [[anns objectAtIndex:i] objectForKey:@"Address"];


    [mapView addAnnotation:myAnnotation];
    [annotations addObject:myAnnotation];
    [myAnnotation release];

EDIT MyAnnotation.h

@interface MyAnnotation : NSObject<MKAnnotation> {

CLLocationCoordinate2D  coordinate;
NSString*               title;
NSString*               subtitle;

}

@property (nonatomic, assign)   CLLocationCoordinate2D  coordinate;
@property (nonatomic, copy)     NSString*               title;
@property (nonatomic, copy)     NSString*               subtitle;

MyAnnotation.m

@implementation MyAnnotation

@synthesize title;
@synthesize subtitle;
@synthesize coordinate;

Hard Code for annotations, (this is inside viewdidload)

[mapView setShowsUserLocation:YES];

CLLocation *userLoc = mapView.userLocation.location;
CLLocationCoordinate2D userCoordinate = userLoc.coordinate;


NSLog(@"user latitude = %f",userCoordinate.latitude);
NSLog(@"user longitude = %f",userCoordinate.longitude);

mapView.delegate=self;

NSMutableArray* annotations=[[NSMutableArray alloc] init];

MKPointAnnotation *annot1 = [[MKPointAnnotation alloc] init]; 
annot1.title = @"TItle1"; 
annot1.subtitle=@"Address of title"; 
annot1.coordinate = CLLocationCoordinate2DMake(21.946114, 120.792778); 
[mapView addAnnotation:annot1]; 

and I did this for 3000 of them, but they ran slow, so I am trying to find a better way

Answer 1

Try this.

Change:

     float realLatitude = [[[anns objectAtIndex:i] objectForKey:@"Latitude"] floatValue];

To this:

     double realLatitude = [[[anns objectAtIndex:i] objectForKey:@"Latitude"] doubleValue];
     NSLog(@" double lat value is %f",realLatitude);

(do longitude also).

Also hint: check for your annotations in the southern Atlantic Ocean, south west of Equatorial Guinea – that’s where Lat/Lon of {0,0} is, and if your data isn’t converting correctly, that’s where your annotations might be.