Parsing JSON objective c

Question

I'm initiating a URL connection and my script is returning the following JSON:

( 1, { "id" = <-ID Here->; hash = <-Hash Here->; }, ( ), ( ) )

All the examples I've seen so far seem to have "ids" or identifiers before respective arrays/dictionaries. Despite searching around, I couldn't find a way to parse this. (i.e. I need to get the first boolean value, the id, the hash, and then the arrays as well (which are empty as of now)).

Sorry if I'm missing something-- I'm new to parsing JSON in Obj-C.Thanks for the help.

Chris Trahey · Accepted Answer · 2012-07-01 17:37:15Z

2

The feature I use is built in with the Cocoa libraries: the NSJSONSerialization class. It provides methods for parsing JSON into a graph, and encoding a graph into JSON. The rules are similar to plists (i.e. basic types plus arrays and dictionaries).

If you have NSData (which you can easily get from a string), you do like this:

NSArray *yourJSONAsObjectGraph = [NSJSONSerialization JSONObjectWithData:yourNSData options:nil error:&err];

Then, with your data above, objectAtIndex:0 would be an NSNumber that you can call boolValue on, objectAtIndex:1 will be an NSDictionary that you can call objectForKey:@"id" (and @"hash"), etc.

answered Jul 1, 2012 at 17:37

Chris Trahey

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2 Comments

Kgrover Over a year ago

Thanks, this is useful. I'll try it out now and let you know.

Chris Trahey Over a year ago

The only caveat is that you need to know (or detect) what type of object the top-level will be. Usually you know because you are talking to your own API, but you can also detect. It will always be either an NSArray or NSDictionary (unless there is an error).

DrummerB · Accepted Answer · 2012-07-01 17:32:10Z

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See How to use JSON in Objective-C. If you didn't hear about it yet, have a look at SBJSON.

answered Jul 1, 2012 at 17:32

DrummerB

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4 Comments

Kgrover Over a year ago

I thought there was a native JSON parser in iOS development now. Am I wrong?

DrummerB Over a year ago

What to you mean by "native"? SBJSON is native. It's pure Objective-C. It's not made by Apple though.

Kgrover Over a year ago

See @ctrahey 's answer...it seems that way I don't have to use anything that's not built in with the default libraries.

Robotic Cat Over a year ago

@Kgrover - NSJSONSerialization is the Apple provided class you are thinking of

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