get Dictionaries Value from Array

Question

this surely is a pretty basic question, but i've been struggling and still no answer.

I have an array of dictionaries, each NSdictionary has the same amount and type of key-value pairs, i want to store all the values(NSstring) of a given key (all dictionaries have that same key) but still no luck.

the last thing i come up with was:

int i=0;
while (i< dictArray.count) {
            [newArray addObject:[dictArray[i] objectForKey:@"keyName"]];
        NSLog(@"%@",[dictArray[i] objectForKey:@"keyName"]);
        NSLog(@"%@",newArray);
        i++;
    }

In the NSlogs i put for debugging, i can see that [rows[i] objectForKey:@"keyName"] displays te correct NSstring value for "keyName", but the Newarray NSlog shows null, what am i doing wrong? is there a better way to get this valúes? thank you!

PD: newArray is a NSMutaleArray

U have tocreate an array with the values in the dictionary according to the key values?, U should use value for key — Chandru
– Chandru, Commented Mar 20, 2014 at 12:51
Have initialized newArray as a nsmutablearray? newArray =[NSMUtableArray array];? — iPP
– iPP, Commented Mar 20, 2014 at 12:53
is it allocated and initialized? newArray =[NSMUtableArray array];? — Burhanuddin Sunelwala
– Burhanuddin Sunelwala, Commented Mar 20, 2014 at 13:12

Ali Abbas · Accepted Answer · 2014-03-20 13:19:28Z

1

I consider the newArray is a Mutable Array. You can do that :

 [dictArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
             [newArray addObject:[obj objectForKey:@"keyName"]];
        }];

edited Mar 20, 2014 at 13:19

answered Mar 20, 2014 at 12:56

Ali Abbas

4,2771 gold badge24 silver badges40 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Maverick Over a year ago

This is the best answer so far. +1 :)

SoulDev Over a year ago

I may be looking wrong...but it isn't a ] missing somewhere?

Nilesh · Accepted Answer · 2014-03-20 13:02:19Z

0

Iterate over the array which has dictionaries..

//Initialze the array
NSMutableArray *newArray = [[NSMutableArray alloc]init];
//For Loop
for (NSMutableDictionary *dict in dictArray) {
[newArray addObject:[dict objectForKey:@"keyName"]];
}

answered Mar 20, 2014 at 13:02

Nilesh

911 silver badge2 bronze badges

Comments

Andrews J · Accepted Answer · 2014-03-20 13:04:04Z

0

It seems your newArray is NSMutableArray object. Did you allocate the newArray before the while loop? If no, please do this before the loop

newArray = [[NSMutableArray alloc] init];

you will be okay.

answered Mar 20, 2014 at 13:04

Andrews J

18712 bronze badges

3 Comments

SoulDev Over a year ago

i've got my newArray initialized as a NSMutableArray since is a property of my class

Andrews J Over a year ago

So you have put the exact line somewhere before the loop starts right?

SoulDev Over a year ago

i thought that, as a property, the NSMutableArray was allocated and initialized, i see my mistake now, thank you!

Collectives™ on Stack Overflow

get Dictionaries Value from Array

3 Answers 3

2 Comments

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related