JSON array for picker view iPhone

Question

I am getting this data from JSON web services

List ARRAY: (
    {
    assets =         (
                    {
            identity = 34DL3611;
            systemId = 544507;
        },
                    {
            identity = 34GF0512;
            systemId = 5290211;
        },
                    {
            identity = 34HH1734;
            systemId = 111463609;
        },
                    {
            identity = 34HH1736;
            systemId = 111463622;
        },
                    {
            identity = 34YCJ15;
            systemId = 294151155;
        }
    );
    identity = DEMO;
    systemId = 4921244;
})

By using this code:

NSArray *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"Response data: %@", responseString);

NSLog(@"List ARRAY: %@", list);

NSDictionary *dict = [list objectAtIndex: 0];

NSMutableArray *vehicleGroups = [dict objectForKey:@"identity"];

NSLog(@"Vehicle Groups: %@", vehicleGroups);

Here is the picker code I am using:

    -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent :(NSInteger)component { 
return [vehicleGroups count];}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{return nil;}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
 }

The application crashes at the line

return [vehicleGroups count];

delegate method numberOfRowsInComponent of pickerView. I am not getting that - why I am facing this issue?

//Code////

    NSArray *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"Response data: %@", responseString);

NSLog(@"List ARRAY: %@", list);

NSDictionary *dict = [list objectAtIndex: 0];

vehicleList = [dict objectForKey: @"assets"];

self.vehicleGroups = [[NSMutableArray alloc] init];

vehicleGroups = [dict objectForKey:@"identity"];

NSLog(@"Vehicle Groups: %@", vehicleGroups);

NSString *identity = [dict objectForKey: @"identity"];

NSString *systemid = [dict objectForKey:@"systemId"];

self.listVehicles = [[NSMutableArray alloc] init];

self.listVehiclesID =[[NSMutableArray alloc]init];

NSLog(@"GroupOfVehicles: %@", groupOfVehicles);

for (NSUInteger index = 0; index < [vehicleList count]; index++) {

    itemDict = [vehicleList objectAtIndex: index];

    [self.listVehicles addObject:[itemDict objectForKey:@"identity"]];

    [self.listVehiclesID addObject:[itemDict objectForKey:@"systemId"]];
}

NSLog(@"Group Name: %@", identity);

NSLog(@"Assets: %@", listVehicles);

NSLog(@"Assets System ID: %@", listVehiclesID);

NSLog(@"GroupSystemID: %@", systemid);

There is nothing in log, it gives me a message: Program received signal: EXC_BAD_ACCESS — Omer Waqas Khan
– Omer Waqas Khan, Commented Jan 17, 2012 at 7:07
show the code for the picker and also mention where the app crashes — Yama
– Yama, Commented Jan 17, 2012 at 7:15
put a breakpoint over there and check if it takes value for vehicleGroups or not. — Yama
– Yama, Commented Jan 17, 2012 at 7:27
@hiren443 response is getting properly I am already getting the data for assets array and it is being used in a table, I think the problem is that I am getting the string not the array ... — Omer Waqas Khan
– Omer Waqas Khan, Commented Jan 17, 2012 at 7:30

Hiren · Accepted Answer · 2014-07-09 05:57:40Z

7

You have to initialise your array first

NSDict *list =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"List Dict: %@", list);

NSMutableArray *temp = list[@"assets"];
NSMutableArray *vehicleGroups = [NSMutableArry array];
vehicleGroups = temp[0][@"identity"];

NSLog(@"Vehicle Groups: %@", vehicleGroups);

edited Jul 9, 2014 at 5:57

answered Jan 17, 2012 at 7:33

Hiren

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8 Comments

Omer Waqas Khan Over a year ago

have initialized it now, but the problem is still there

Hiren Over a year ago

then NSLog your dictionary and check it its shown or nil also tyr first NSLog your dict

Hiren Over a year ago

you need all the identity in your vehicleGroups?

Omer Waqas Khan Over a year ago

List ARRAY: ( {assets = ({ identity = 34DL3611; systemId = 544507;},{....}....); identity = DEMO; systemId = 4921244;} Here I m getting all the values for assets and identity (in the assets array), but the value for identity = DEMO which is in List Array should be shown in picker view, its not working

Omer Waqas Khan Over a year ago

check my question again please I have edited it and added code

|

Omer Waqas Khan · Accepted Answer · 2012-01-18 07:20:24Z

Answering my own question guide others if they face the same problem, Actually what I have done here to get the required array for identity: DEMO is as follows:

vehicleGroups =[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSLog(@"Response data: %@", responseString);

NSLog(@"List ARRAY: %@", vehicleGroups);

NSDictionary *dict1 = [vehicleGroups objectAtIndex: 0];

NSString *identity1 = [dict objectForKey: @"identity"];

NSLog(@"dictNEW: %@", dict1);

groupOfVehicles = [[NSMutableArray alloc] init];
for (NSUInteger index = 0; index < [vehicleGroups count]; index++) {

    itemDict = [vehicleGroups objectAtIndex: index];

    [groupOfVehicles addObject:[itemDict objectForKey:@"identity"]];
}

NSLog(@"Group Name NEW: %@", identity1);

NSLog(@"Groups NEW: %@", groupOfVehicles);

After using that code I have properly got the array for my required data

Yama · Accepted Answer · 2012-01-17 07:35:41Z

0

retain the array as

[vehicleGroups retain] after vehicleGroups = [dict objectForKey:@"identity"];

answered Jan 17, 2012 at 7:35

Yama

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1 Comment

Omer Waqas Khan Over a year ago

I have tried this now got this error on console: -[__NSCFString count]: unrecognized selector sent to instance

Bonny · Accepted Answer · 2012-01-17 07:52:39Z

0

NSDictionary *dicts = [list objectAtIndex: 0];
NSMutableArray *vehicleGroups = [[NSMutableArray  alloc] init];
for (NSDictionary *dict in dicts) 
{
    NSString* identity = [dict objectForKey:@"identity"];
    [vehicleGroups addObject:identity];
}
NSLog("count is %d",[vehicleGroups count]);

have a try :)

answered Jan 17, 2012 at 7:52

Bonny

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1 Comment

Omer Waqas Khan Over a year ago

got error [__NSCFString addObject:]: unrecognized selector sent to instance

Thomas Nadin · Accepted Answer · 2012-01-17 11:07:49Z

0

Your JSON data is not JSON.

{
    "assets" : [
        {
            "identity" : "34DL3611",
            "systemId" : 544507
        },
        ....
        {
            "identity" = "34YCJ15",
            "systemId" = 294151155
        }
    ],
   "identity" = "DEMO",
   "systemId" = 4921244
}

This is a possible example of your data was it described in JSON.

answered Jan 17, 2012 at 11:07

Thomas Nadin

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Comments

Caleb · Accepted Answer · 2012-01-17 11:18:04Z

0

NSDictionary *dict = [list objectAtIndex: 0];

NSMutableArray *vehicleGroups = [dict objectForKey:@"identity"];

It looks to me like dict here is a dictionary with three entries: assets, identity, and systemId. At this level, the value of identity is just a string, "DEMO", but you're trying to assign it to a mutable array. I think you want something like this instead:

NSDictionary *dict = [list objectAtIndex: 0];
NSArray *assets = [dict objectForKey:@"assets"];
NSArray *vehicleGroups = [assets objectForKey:@"identity"];

(It's okay to send -objectForKey: to an array -- you get back an array of objects corresponding to the given key for each object in the receiver.)

answered Jan 17, 2012 at 11:18

Caleb

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