Download JSON async crash

0
votes

I download my Firebase database in json with AFNetworking 3. Everything works fine but there is a crash in the function cellForRoAtIndexPath. Thanks

Work :

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager GET:@"https://jojol-concours-lists.firebaseio.com/.json" parameters:URLParameters progress:nil success:^(NSURLSessionTask *task, id responseObject) {

        self.contestArray = responseObject;

        [_collectionView reloadData];
    } failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];

Work :

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [self.contestArray count];
}

Not work : (NSDictionary *array = [self.contestArray objectAtIndex:indexPath.row];)

    - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                      cellForItemAtIndexPath:(NSIndexPath *)indexPath {

        DemoCollectionViewCell *retVal = [collectionView dequeueReusableCellWithReuseIdentifier:@"collectionViewCell"
                                                                                   forIndexPath:indexPath];

//////// Not work ///////
        NSDictionary *array = [self.contestArray objectAtIndex:indexPath.row];
//////// Not work ///////

        retVal.name.text = @"";

        retVal.contentView.layer.cornerRadius = 10;
        retVal.contentView.layer.masksToBounds = YES;

        return retVal;
    }

JSON :

{
  "Concours-1" : {
    "Description" : "Description du concours",
    "Title" : "Titre"
  },
  "Concours-2" : {
    "Description" : "Description du concours",
    "Titre" : "iPhone 6"
  }
}

Log Crash :

-[NSDictionaryI objectAtIndex:]: unrecognized selector sent to instance 0x61000086c8c0 2017-07-18 10:00:26.787 jojol67[7003:4420828] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI objectAtIndex:]: unrecognized selector sent to instance 0x61000086c8c0' *** First throw call stack: ( 0 CoreFoundation 0x000000010c084b0b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010e5c9141 objc_exception_throw + 48 2 CoreFoundation 0x000000010c0f4134 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132 3 CoreFoundation 0x000000010c00b840 ___forwarding_ + 1024 4 CoreFoundation 0x000000010c00b3b8 _CF_forwarding_prep_0 + 120 5 jojol67 0x000000010756db3f -[DEMOConcoursTableViewController collectionView:cellForItemAtIndexPath:] + 191 6 UIKit 0x000000010d162925 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 446 7 UIKit 0x000000010d162761 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 35 8 UIKit 0x000000010d1679bd -[UICollectionView _updateVisibleCellsNow:] + 4764 9 UIKit 0x000000010d16d38e -[UICollectionView layoutSubviews] + 313 10 UIKit 0x000000010c8f355b -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1268 11 QuartzCore 0x000000010c6a4904 -[CALayer layoutSublayers] + 146 12 QuartzCore 0x000000010c698526 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 370 13 QuartzCore 0x000000010c6983a0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 14 QuartzCore 0x000000010c627e92 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294 15 QuartzCore 0x000000010c654130 _ZN2CA11Transaction6commitEv + 468 16 QuartzCore 0x000000010c654b37 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 115 17 CoreFoundation 0x000000010c02a717 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 23 18 CoreFoundation 0x000000010c02a687 __CFRunLoopDoObservers + 391 19 CoreFoundation 0x000000010c00f720 __CFRunLoopRun + 1200 20 CoreFoundation 0x000000010c00f016 CFRunLoopRunSpecific + 406 21 GraphicsServices 0x00000001103c2a24 GSEventRunModal + 62 22 UIKit 0x000000010c830134 UIApplicationMain + 159 23 jojol67 0x000000010752ef5f main + 111 24 libdyld.dylib 0x000000010f31d65d start + 1 25 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

/////// Firebase realtime database ////////

enter image description here

4
iosobjective-cjsoncrash
A crash => You have a crash log then? – Larme
The error message is explicit and confirmed with the JSON structure: your JSON is a NSDictionary at top level, not an Array. – Larme
your self.contestArray is NSDictionary not NSArray so you must access with NSDictionary *array = [self.contestArray objectForKey:"key"]; use NSLog(@"%@",self.contestArray) to see the keys and values of self.contestArray – Reinier Melian
@ReinierMelian //////// work //////// NSDictionary *array = [self.contestArray valueForKey:@"Concours-1"]; /////// not work (I need that one) //////// NSDictionary *array2 = [self.contestArray objectAtIndex:indexPath.row]; – victor bill
Indeed your retrieved dictionary don't have any array inside – Reinier Melian

4 Answers

0
votes

It will help you for such responce:

NSDictionary *jsonDict =responseObject;

NSArray *allKeys = [jsonDict allKeys];
NSMutableArray *allDataArray = [NSMutableArray new];
for (int x = 0; x<allKeys.count; x++) {
    NSString *key = [allKeys objectAtIndex:x];
    [allDataArray addObject:[jsonDict valueForKey:key]];

    // then reload your collection on allDataArray
}
3
votes

Your id responseObject is not an array because your JSON contains an object not an array. App crashes because you are calling objectAtIndex on a NSDictionary object.

If you want to access this JSON as an array, you may want to format it to something like this,

[{
    "Concours": 1,
    "Description": "Description du concours",
    "Title": "Titre"
}, {
    "Concours": 2,
    "Description": "Description du concours",
    "Titre": "iPhone 6"
}]
0
votes

Current JSON:

{
  "Concours-1" : {
    "Description" : "Description du concours",
    "Title" : "Titre"
  },
  "Concours-2" : {
    "Description" : "Description du concours",
    "Titre" : "iPhone 6"
  }
}

How it should be:

[
  {
    "Description": "Description du concours",
    "Title": "Titre"
  },
  {
    "Description": "Description du concours",
    "Titre": "iPhone 6"
  }
]
0
votes

"-[NSDictionaryI objectAtIndex:]: unrecognized selector sent to instance 0x61000086c8c0 " It seems that the self.contestArray is NSDictionary class;

You can log the responseObject it maybe a Dictionary , not Array;