How to access array of dictionaries and use the dictionary objects in Objective C?

Question

This is my "po array" looks like.

<__NSArrayI 0x7fe093f87160>(
<Entry: 0x600000498c90> (entity: Entry; id: 30506398-1852-433D-B536- 
DC57F484F754> ; data: {
cumulativeTime = 0000;
latitude = “12.972442”
longitude = "77.580643";
type = enrty;
entryName = Bangalore;
}),
<Entry: 0x600000498c90> (entity: Entry; id: 30506398-1852-433D-B536- 
DC57F484F754> ; data: {
cumulativeTime = 0000;
latitude = “13.067439”
longitude = "80.237617";
type = enrty;
entryName = Chennai;
})

The above JSON is stored in and I'm retrieving using the below code.

 +(NSArray*) routePlan
{
     NSString* aircraftJSONString = [NSString stringWithContentsOfURL [[NSBundle mainBundle] URLForResource:@"Documents/DataJson" withExtension:nil]

encoding:NSUTF8StringEncoding error:nil];
NSArray* aircraftJsonFplWaypoints = [aircraftJSONString componentsSeparatedByString:@","];
}

I can access the array[0] but not the objects in array[0]. I need the latitude and longitude. Any idea how to strip down to the inside dictionary values.

get array[0] as dictionary than get value of the key from dictionary. — MRizwan33
– MRizwan33, Commented Mar 28, 2018 at 9:12
This can never be the array in the question. By the way: Please don't use the comments to add information. Edit your question. — vadian
– vadian, Commented Mar 28, 2018 at 9:41

vadian · Accepted Answer · 2018-03-28 09:25:59Z

2

The dictionaries seem to be instances of an NSManagedObject subclass named Entry.

Just use a loop to iterate over the entries

for (Entry *entry in array) {
    NSLog(@"lat: %@ - long: %@", entry.latitude, entry.longitude);

}

answered Mar 28, 2018 at 9:25

vadian

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4 Comments

Hirak Barman Over a year ago

No luck. Still crash.

vadian Over a year ago

You are talking about two different things. The po array mentioned in the question and the array you got from the JSON string. The former is an array of Entry instances and the latter is an array of String. There is no dictionary involved. Usually JSON is supposed to be deserialized with NSJSONSerialization.

Hirak Barman Over a year ago

Sorry. I'm new to dev and got stuck on this issue.

vadian Over a year ago

Sorry, the question cannot be answered with the current information. Please add more information for example the JSON and what you are going to accomplish.

Rishab · Accepted Answer · 2018-03-28 09:13:48Z

0

You have an array of dictionaries and you need to parse through it.

I haven't tried running this code but this should work. Later on you can add some safety checks for nil values.

NSDictionary *dict = array[0];
NSString *latitude = dict["latitude"];
NSString *longitude = dict["longitude"];

answered Mar 28, 2018 at 9:13

Rishab

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Comments

Florian Burel · Accepted Answer · 2018-03-28 09:17:19Z

0

You can use key value coding :

[array[0] valueForKey:@"latitude"];

answered Mar 28, 2018 at 9:17

Florian Burel

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Comments

Prakash Tripathi · Accepted Answer · 2018-03-28 09:30:35Z

0

Simply use objective c fast enumeration for getting data from ArrayList.

for (NSDictionary *dic in array) {
    NSLog(@"dic values %@",[dic objectForKey:@"data"]);

    NSDictionary *data = [dic objectForKey:@"data"];

    NSString *lat = [data objectForKey:@"latitude"];

}

edited Mar 28, 2018 at 9:30

answered Mar 28, 2018 at 9:12

Prakash Tripathi

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5 Comments

Hirak Barman Over a year ago

Does not work. *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString objectForKey:]: unrecognized selector sent to instance 0x7fdc427a7ab0'

Prakash Tripathi Over a year ago

@HirakBarman try to get [dic objectForKey:@"data"]. if you are getting then let me know.

Hirak Barman Over a year ago

Nope getting crash.

Prakash Tripathi Over a year ago

@HirakBarman can you share source from where this data is getting or share your code

Prakash Tripathi Over a year ago

@HirakBarman check your array content weather is it properly in JSON format or not. you can use online tools for JSON format validation.

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