CODEWITHSUNDEEP
iphoneobjective-cjson
doxsi
doxsi

Reputation: 1024

json representation for iphone localization app

I have a write a simple json representing the position of same places like:

{
        lat = "41.653048";
        long = "-0.880677";
        name = LIMPIA;
    },

In iphone programming, my app is able to show the position on the map. My question is about how replicate the same on multiple position. For example with a json like:

    {
    lat = "41.653048";
    long = "-0.890677";
    name = name1 ;
},

    {
    lat = "41.653048";
    long = "-0.890677";
    name = name2;
},

How i can able to know the number of itemes? I have to change the json adding anything else in representation?or i have to completelin change it?

Upvotes: 0

Views: 227

Answers (3)

tacos_tacos_tacos
tacos_tacos_tacos

Reputation: 10585

Not sure if you mean to parse or write JSON from/to objects. I outline both.

@interface MyPointModel : NSObject

@property (nonatomic, strong) NSNumber *latitude;
@property (nonatomic, strong) NSNumber *longitude;
@property (nonatomic, strong) NSString *name;

@end

@implementation MyPointModel

@synthesize latitude, longitude, name;

@end

Parsing

(and where ever you do the parsing)

@implementation ParsingController

...
- (NSArray *)buildArrayOfMyPointModelWithString:(NSString *)json {

    NSArray *array = [jsonParser.objectWithString:json error:NULL];
    NSMutableArray *arrayOfMyPointModel = [[NSMutableArray alloc] init];

    for (id jsonElement in array) {
        MyPointModel *m = [[MyPointModel alloc] init];

        m.latitude = [jsonElement valueForKey:@"lat"];
        m.longitude = [jsonElement valueForKey:@"long"];
        m.name = [jsonElement valueForKey:@"name"];

        [arrayOfMyPointModel addObject:m];
    }

    return (NSArray *)arrayOfMyPointModel;
}

Writing

(a sample array of my point)

NSMutableArray *a = [[NSMutableArray alloc] init];
MyPointModel *m1 = [[MyPointModel alloc] init];
MyPointModel *m2 = [[MyPointModel alloc] init];
m1.latitude = [NSNumber numberWithDouble:0.1];
m1.longitude = [NSNumber numberWithDouble:0.01];
m1.name = @"M1";
m2.latitude = [NSNumber numberWithDouble:0.2];
m2.longitude = [NSNumber numberWithDouble:0.02];
m2.name = @"M2";
[a addObject:m1];
[a addObject:m2];

- (NSString *)buildJsonStringWithMyPointModelArray:(NSArray *)array {

    SBJsonWriter *writer = [[SBJsonWriter alloc] init];

    return [writer stringWithObject:array];
}

Upvotes: 0

Dima
Dima

Reputation: 23634

I'm not sure I understand your question but it seems like you want to know how to best include multiple points in one JSON object?

{ 
  "locations": 
   [ 
      {
        lat = "41.653048";
        long = "-0.890677";
        name = name1 ;

      }, 
      {
        lat = "41.653048";
        long = "-0.890677";
        name = name2;

      }
   ] 
}

Upvotes: 0

Pablo Santa Cruz
Pablo Santa Cruz

Reputation: 181350

You need to use a JSON array:

[
  {
    lat = "41.653048";
    long = "-0.890677";
    name = name1 ;
  },
  {
    lat = "41.653048";
    long = "-0.890677";
    name = name2;
  },
]

Upvotes: 1

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