Displaying multiple locations in MapView

This Blog describes how to show multiple locations in map view.

First you have to create an array in which multiple annotations will be saved.

In your ViewController.h file

NSMutableArray *addAnnotationsArray;
AddressAnnotation *addAnnotation;


In your ViewController.m file

addAnnotationsArray=[[NSMutableArray alloc]init];

Now initialize the for loop and and play it till how much locations you have to show on the map(In my case I have passed the count of my mapAddressArray which have the names of the locations ).
int k;
for(k=0;k<[self.mapAddressArray count];k++)
{
CLLocationCoordinate2D location;

I have called addressLocation method which returns the location coordinates of that location.


location=[self addressLocation:[self.mapAddressArray objectAtIndex:k]];

I have created seperate AddressAnnotation class and in this view controller created a object of that class and called initWithCoordinate method.

addAnnotation=[[AddressAnnotation alloc]initWithCoordinate:location];

[addAnnotation setMTitle:[self.companiesName objectAtIndex:k]];
[addAnnotation setMSubTitle:[self.mapAddressArray objectAtIndex:k]];

Add annotation to the addAnnotationsArray .

[self.addAnnotationsArray addObject:addAnnotation];

[addAnnotation release];
}

You have added the annotations in the array .Now you have to display these annotations on the map

int l;
for(l=0;l<[self.addAnnotationsArray count];l++)
{
[map addAnnotation:[self.mapAddAnnotations objectAtIndex:l]];
}

AddressLocation Method:-

-(CLLocationCoordinate2D) addressLocation:(NSString *)addrss {
NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv",
[addrss stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:@","];

double latitude = 0.0;
double longitude = 0.0;

if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
latitude = [[listItems objectAtIndex:2] doubleValue];
longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
//Show error
}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;

return location;
}

AddressAnnotation.h

#import<MapKit/MapKit.h>


@interface AddressAnnotation :NSObject<MKAnnotation> {

CLLocationCoordinate2D coordinate;
NSString *mTitle;
NSString *mSubTitle;

}

@property (nonatomic, retain) NSString *mSubTitle;
@property (nonatomic, retain) NSString *mTitle;


@end


AddressAnnotation.m


#import "AddressAnnotation.h"


@implementation AddressAnnotation

@synthesize coordinate,mTitle, mSubTitle,mapId;

- (NSString *)subtitle{
return mSubTitle;
}

- (NSString *)title{
return mTitle;
}


-(id)initWithCoordinate:(CLLocationCoordinate2D) c{
coordinate=c;
//NSLog(@"%f,%f",c.latitude,c.longitude);
return self;
}



@end