Parsing JSON into individual NSArray elements - ios

Question

My problem is this. When Im parsing my JSON data it is getting returned to me as an NSSArray with one element. Inside this one element it looks like this:
2015-07-14 20:45:38.467 ICBuses[51840:14872349] Bus Location: {
agencyname = Cambus;
agencytag = uiowa;
color = 00ff66;
directions = (
{
direction = Loop;
directiontag = loop;
stops = (
{
directiontitle = Loop;
stoplat = "41.659541";
stoplng = "-91.53775";
stopnumber = 1050;
stoptitle = "Main Library";
},
{
directiontitle = Loop;
stoplat = "41.6414999";
stoplng = "-91.55676";
stopnumber = 3200;
stoptitle = "Studio Arts Building";
},
{
directiontitle = Loop;
stoplat = "41.66504";
stoplng = "-91.54094";
stopnumber = 2100;
stoptitle = "Art Building";
},
{
directiontitle = Loop;
stoplat = "41.6662587";
stoplng = "-91.5405201";
stopnumber = 2106;
stoptitle = "Theatre Building";
},
{
directiontitle = Loop;
stoplat = "41.6679058";
stoplng = "-91.5401033";
stopnumber = 2120;
stoptitle = "Hancher/North Riverside";
},
{
directiontitle = Loop;
stoplat = "41.6660209";
stoplng = "-91.5406198";
stopnumber = 2105;
stoptitle = "Riverside & River St";
},
{
directiontitle = Loop;
stoplat = "41.66499";
stoplng = "-91.54106";
stopnumber = 2101;
stoptitle = "Art Building West";
},
{
directiontitle = Loop;
stoplat = "41.6612";
stoplng = "-91.5403422";
stopnumber = 145;
stoptitle = EPB;
}
);
}
);
I want each block to be in there once element...How do I do this? Below is my coded that parses the data and stores it to an array.
code that stores it to an array:
self.routeInfo = [[API sharedAPI] routeInfoAgency:self.routeAgency
Route:self.route];
self.busLocation = [[API sharedAPI] busLocation:self.routeAgency
Route:self.route];
NSLog(#"Bus Location: %#", self.routeInfo);
Heres the code that gets it from the server and parses it:
- (NSArray *) routeInfoAgency:(NSString *)agency Route:(NSString *)route {
NSError *error;
NSString *requestString = [NSString stringWithFormat:#"http://api.ebongo.org/route?format=json&agency=%#&route=%#&api_key=", agency, route];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"%#%#",requestString, kApiKey]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];
if (!data) {
NSLog(#"Download Error: %#", error.localizedDescription);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:[NSString stringWithFormat:#"Error %#", error.localizedDescription] delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alert show];
return nil;
}
NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];
NSArray *JSONArray = [JSON valueForKeyPath:#"route.directions"];
return JSONArray;
}
I want what is after stops = to be in an array that where each element is a block of directions title, stipulate, stoping, stop number and stoptitle.
Thank you
When I try to use floatValue I get this error:
{
When I do that I'm getting this error {2015-07-15 10:31:05.821 ICBuses[56344:16107040] -[__NSArrayI floatValue]: unrecognized selector sent to instance 0x7f91fb5bdf90
2015-07-15 10:31:05.868 ICBuses[56344:16107040] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI floatValue]: unrecognized selector sent to instance 0x7f91fb5bdf90'
*** First throw call stack:
(
0 CoreFoundation 0x000000010bc53c65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010b8ecbb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010bc5b0ad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010bbb113c ___forwarding___ + 988
4 CoreFoundation 0x000000010bbb0cd8 _CF_forwarding_prep_0 + 120
5 ICBuses 0x000000010958f26e -[MapViewController viewDidLoad] + 3950
6 UIKit 0x000000010c17d1d0 -[UIViewController loadViewIfRequired] + 738
7 UIKit 0x000000010c17d3ce -[UIViewController view] + 27
8 UIKit 0x000000010c1a2257 -[UINavigationController _startCustomTransition:] + 633
9 UIKit 0x000000010c1ae37f -[UINavigationController _startDeferredTransitionIfNeeded:] + 386
10 UIKit 0x000000010c1aeece -[UINavigationController __viewWillLayoutSubviews] + 43
11 UIKit 0x000000010c2f96d5 -[UILayoutContainerView layoutSubviews] + 202
12 UIKit 0x000000010c0cc9eb -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 536
13 QuartzCore 0x000000010b18eed2 -[CALayer layoutSublayers] + 146
14 QuartzCore 0x000000010b1836e6 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
15 QuartzCore 0x000000010b183556 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
16 QuartzCore 0x000000010b0ef86e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242
17 QuartzCore 0x000000010b0f0a22 _ZN2CA11Transaction6commitEv + 462
18 QuartzCore 0x000000010b0f10d3 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 89
19 CoreFoundation 0x000000010bb86ca7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
20 CoreFoundation 0x000000010bb86c00 __CFRunLoopDoObservers + 368
21 CoreFoundation 0x000000010bb7ca33 __CFRunLoopRun + 1123
22 CoreFoundation 0x000000010bb7c366 CFRunLoopRunSpecific + 470
23 GraphicsServices 0x000000010e727a3e GSEventRunModal + 161
24 UIKit 0x000000010c04c8c0 UIApplicationMain + 1282
25 ICBuses 0x000000010958e2cf main + 111
26 libdyld.dylib 0x000000010d481145 start + 1
27 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I think it is because the for loop is saving it as an array with one element.
Any suggestions?

Answer 1

It looks like it's not an array at all. It looks like it's actually a dictionary. When you log a collection like that you can see dictionaries because they are marked with { and arrays are marked with (. Based on the structure of your data, something like this should get the correct members:
NSDictionary *JSONDict = [JSON valueForKeyPath:#"route.directions"];
NSArray *directions = JSONDict[#"directions"];
NSDictionary *directionsDict = directions.firstObject; // seems to be an array with just 1 element.
NSArray *stops = directionsDict[#"stops"];
for(NSDictionary *stop in stops)
{
NSString *title = stop[#"directiontitle"];
NSString *stopLat = stop[#"stoplat"];
// etc
}

Answer 2

In your example, it appears that [JSON valueForKeyPath:#"route.directions"]; returns a NSSdictionary, not a NSArray.
NSDictionary *json = [NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableContainers
error:&error];
NSDictionary * directions = [json valueForKeyPath:#"route.directions"];
NSArray * stops = [directions valueForKeyPath:#"stops"];
You can then iterate through the stops array.