How to plot the markers in google maps from a dictionay in ios?

问题

In my app, I have done JSON parsing and I got the coordinates in the form of a dictionary, I want to use the coordinates angd plot it in the map,
I have using this

SBJsonParser *jsonParser = [SBJsonParser new];    
NSArray *jsonData = (NSArray *) [jsonParser objectWithString:outputData error:nil];
for(int i=0;i<[jsonData count];i++)
{
    NSDictionary *dict=(NSDictionary *)[jsonData objectAtIndex:i];
    Nslog(@"%@",dict);
    double la=[[dict objectForKey:@"latitude"] doubleValue];
    double lo=[[dict objectForKey:@"longitude"] doubleValue];

    CLLocation * loca=[[CLLocation alloc]initWithLatitude:la longitude:lo];
    CLLocationCoordinate2D coordi=loca.coordinate;

    marker=[GMSMarker markerWithPosition:coordi];
    marker.snippet = @"Hello World";
    marker.animated = YES;
    marker.map = mapView;
}

it is printed as

[{"driver_id":"Tn1234sunil@gmail.com","username":"sunil","latitude":"0.000000000000000",  
"longitude":"0.000000000000000"},  
{"driver_id":"ma12marii@yahoo.com","username":"mari","latitude":"13.040720500000000",  
"longitude":"80.243139600000000"},     {"driver_id":"45sabala@gmail.com","username":"balaji","latitude":"0.000000000000000",  
"longitude":"0.000000000000000"}

Then, In my log, it is getting printed as

2014-01-04 10:55:48.121 MyTaxi[608:12e03] latitude : 0.000000
2014-01-04 10:55:48.121 MyTaxi[608:12e03] longitude : 0.000000
2014-01-04 10:55:48.122 MyTaxi[608:12e03] latitude : 13.040721
2014-01-04 10:55:48.122 MyTaxi[608:12e03] longitude : 80.243140
2014-01-04 10:55:48.122 MyTaxi[608:12e03] latitude : 0.000000
2014-01-04 10:55:48.123 MyTaxi[608:12e03] longitude : 0.000000

But, this doesnt works properly

Does any body have an idea how to plot these points to the google maps

回答1:

try this one this might be helpful just create a for loop to your count ,increment it ...

NSDictionary *dict=(NSDictionary *)[jsonData objectAtIndex:i];
    double la=[[dict valueForKey:@"latitude"] doubleValue];
    double lo=[[dict valueForKey:@"longitude"] doubleValue];

    NSMutableArray * latArray=[[NSMutableArray alloc]init];
    NSMutableArray * longArray=[[NSMutableArray alloc]init];

    [latArray addObject:[NSNumber numberWithDouble:la]];
    [longArray addObject:[NSNumber numberWithDouble:lo]];

    CLLocation * loca=[[CLLocation alloc]initWithLatitude:[[latArray objectAtIndex:i]doubleValue] longitude:[[longArray objectAtIndex:i]doubleValue]];
    CLLocationCoordinate2D coordi=loca.coordinate;

    GMSMarker *marker= [[GMSMarker alloc] init];
    marker=[GMSMarker markerWithPosition:coordi];
    marker.position = CLLocationCoordinate2DMake([[latArray objectAtIndex:i]doubleValue], [[longArray objectAtIndex:i]doubleValue]);
    marker.snippet = @"Hello World";
    marker.animated = YES;
    marker.map = mapView;

回答2:

I think , You have to alloc Marker in for loop, right now you are creating only one marker,

for(int i=0;i<[jsonData count];i++)
{
  NSDictionary *dict=(NSDictionary *)[jsonData objectAtIndex:i];
double la=[dict valueForKey:@"latitude" doubleValue];
double lo=[dict valueForKey:@"longitude" doubleValue];

CLLocation * loca=[[CLLocation alloc]initWithLatitude:la longitude:lo];
CLLocationCoordinate2D coordi=loca.coordinate;

 GMSMarker *marker= [[GMSMarker alloc] init];
marker=[GMSMarker markerWithPosition:coordi];
    marker.snippet = @"Hello World";
    marker.animated = YES;
    marker.map = mapView;
.....

}

来源：https://stackoverflow.com/questions/20902732/how-to-plot-the-markers-in-google-maps-from-a-dictionay-in-ios

标签

ios

google-maps

nsarray

nsdictionary

sbjson