CLLocationCoordinate2D转换返回null

Question

im trying to convert longituude and latitude to NSNumbers to save them in core data.

following my code:

getting coordinate

CLLocationCoordinate2D coordinate = [[mapView.annotations objectAtIndex:0] coordinate];
    NSLog(@"Long2: %f", coordinate.longitude);
    NSLog(@"Lat2: %f", coordinate.latitude);

Output

2013-04-28 20:22:05.918 [1892:16a03] Long2: -122.406417
2013-04-28 20:22:05.918 [1892:16a03] Lat2: 37.785834

Setting values:

[members.eventDTO setLatLong:coordinate];
- (void)setLatLong: (CLLocationCoordinate2D)coordinate{
    self.locLatitude = [NSNumber numberWithDouble:coordinate.latitude];
    self.locLongitude = [NSNumber numberWithDouble:coordinate.longitude];
}

then i tried that for output:

NSLog(@"Long2: %f", [members.eventDTO.locLongitude doubleValue]);
NSLog(@"Lat2: %@", members.eventDTO.locLatitude);

2013-04-28 20:22:05.918 [1892:16a03] Long2: 0.000000
2013-04-28 20:22:05.919 [1892:16a03] Lat2: (null)

any clue its returning that?

Answer 1

According to what you described in your question, it seems that the object is still nil after you set it in your setLatLong: method. My hints that I can suggest here are:

• try to log the NSNumber inside your setLatLong: method to check if they are being created correctly;
• try to log self.locLatitude and self.locLongitude after you set them, to see if they are assigned correctly.
• are the NSManagedObject being created correctly?
• are you calling save to your NSManagedObjectContext?

Please post more info so we can hunt the problem together ;)