Using string for variable name iOS

Question

I got some trouble to find how to use a string for my CLLocationCoordinate2D name variable. In my code I got 90 location :

CLLocationCoordinate2D location1;
...
CLLocationCoordinate2D location90;

And I would like to call this method :

locationConverToImage = [myMapView convertCoordinate:location1 toPointToView:drawView];

in a for loop like this :

for (int i=1; i<=90; i++) {
    NSString *newCoord = @"location";
    [newCoord stringByAppendingString:[NSString stringWithFormat:@"%d",i]];
    locationConverToImage = [myMapView convertCoordinate:newCoord toPointToView:drawView];
}

But the problem is that I can't use string for the variable name. How can I do ?

Thanks.

OR KVC will also do, see this [answer](http://stackoverflow.com/questions/15825602/xcode-how-do-i-put-this-into-a-loop/15826047#15826047) — Anoop Vaidya, Apr 29 '13 at 08:53
try saving your location data in array. P.S. My goodness, have you really created 90 variables in you interface list? :) — art-divin, Apr 29 '13 at 09:52
This is a first iteration, 'cause I can't find how to use a kmlParser for my mapview. — Glou94, Apr 29 '13 at 10:14

score 1 · Answer 1 · answered Apr 29 '13 at 08:52

you could have used arrays, but for your question this is my answer:

for (int i=1; i<=90; i++) {
        NSString *newCoord = [NSString stringWithFormat:@"location%d", i];
        CLLocationCoordinate2D coordinate = (CLLocationCoordinate2D)[self valueForKey:newCoord];
        locationConverToImage = [myMapView convertCoordinate:coordinate toPointToView:drawView];
    }

score 0 · Answer 2 · answered Apr 29 '13 at 08:56

0

You can do something like this using array

Create your array with CLLocation objects since you can't add CLLocationCoordinate2D directly to an Array. See the code below

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

    for(int i=1;i<=90;i++){
       CLLocation *loc=[[CLLocation alloc] initWithLatitude:LAT longitude:LNG];
       [locations addObject:loc];
    }

Then

for(CLLocation *loc locations){
  locationConverToImage = [myMapView convertCoordinate:loc.coordinate toPointToView:drawView];

}

answered Apr 29 '13 at 08:56

iphonic

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How can I use LAT and LNG in the first loop ? I tried NSArray *longt = @[longitude1,...,longitude90]; But not working, because it's not an object. :/ – Glou94 Apr 29 '13 at 09:49
You must be getting `LAT` and `LNG` from somewhere ? And I have mentioned that `CLLocationCoordinate2D ` are not object use `CLLocation` instead.. – iphonic Apr 29 '13 at 10:03
you cannot save non-object instances in any objc container class (like NSArray). To save CLLocation in NSArray, you should use CLLocationCoordinate2D loc = kCLLocationCoordinate2DInvalid; NSValue *val = [NSValue valueWithBytes:&loc objCType:@encode(CLLocation)]; NSArray *array = @[ val ]; CLLocationCoordinate2D locExtracted; [val getValue:&locExtracted]; – art-divin Apr 29 '13 at 10:05
I wrote them in the code like this : CLLocationCoordinate2D location1; location1.latitude=2.399483; location1.longitude=48.800983; – Glou94 Apr 29 '13 at 10:12

Using string for variable name iOS

2 Answers2