Getting Array from for loop iterations in Objective-C

Question

I am using this code to get the values of JSON,

    NSDictionary *dict = [list objectAtIndex: 0];

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

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

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

    itemDict = [vehicleList objectAtIndex: index];

    NSMutableArray *listVehicles = [itemDict objectForKey: @"identity"];

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

it is working properly and showing exact results

Assets: 34DL3611
Assets: 34GF0512
Assets: 34HH1734
Assets: 34HH1736
Assets: 34YCJ15

I want to use these values to populate an array so that I would use that array for tableview.

Bourne · Accepted Answer · 2012-01-06 06:26:23Z

3

Make your listVehicles a NSMutableArray and do [listVehicles addObject:[itemDict objectForKey:@"identity"]] instead of what you are currently doing inside your loop.

answered Jan 6, 2012 at 6:26

Bourne

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3 Comments

Bourne Over a year ago

you haven't done it right. Create an array first and add the object properly. Your new fix (I suppose) NSMutableArray *listVehicles = [itemDict objectForKey: @"identity"]; isn't what I've told you .

user831679 Over a year ago

no I used this as you told me [listVehicles addObject:[itemDict objectForKey:@"identity"]];

Bourne Over a year ago

listVehicles = [[NSMutableArray alloc] init]; outside your loop. And then [listVehicles addObject:[itemDict objectForKey:@"identity"]]; inside your loop.

Ryan Crews · Accepted Answer · 2012-01-06 06:38:10Z

1

If I'm reading what you're saying correctly I would suggest creating your for loop slightly differently to increase readability and streamline the method.

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


NSMutableArray * listVehicles = [NSMutableArray arrayWithCapacity:vehicles.count];


for (NSDictionary * currentDictionary in vehicles)
{
    NSString * identity = [currentDictionary objectForKey:@"identity"];

    [listVehicles addObject:identity];
    NSLog(@"Added %@ to the array, which is now contains %d objects", identity, listVehicles.count);
}

This is a nice built in feature that keeps you from needing to deal with counts and calling objectForIndexAt:

I just quickly typed that up, but I'm pretty sure it does what you're doing. If not though, I still encourage you to tweak it and use that iteration style, I think you'll like it.

answered Jan 6, 2012 at 6:38

Ryan Crews

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2 Comments

user831679 Over a year ago

thanx for this information Ryan Crews ... can't accept two answers for 1 question but voting it up.. :)

Ryan Crews Over a year ago

No worries, the actual answer is the same, just wanted to share the iteration tip =]

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