Not able to load data in each section of UICollection view?

Question

I have some json data which have some documents.It have 4 section -in each section it have some data or no data.I need to display the data of each section

My question is:

1. I used NSDictionary to store all section data in one array and i tried to display.But it not showing my data
2. In each section the title should be ( eg: white(0-data), Black(3-data) like that).That i tried ,but din get that.

Answer 1

There are some changes needs to be done with your code. Try the below.

In viewDidLoad,

[self getdata];
[self.mycollectionView reloadData];

In getdata method,

NSArray *arrayFiles = [NSArray arrayWithObjects: dictOriginal, dictOriginal2, dictOriginal3, dictOriginal4, nil];

for (NSDictionary *dict in arrayFiles) {
  NSMutableArray *arr = [NSMutableArray array];
  NSArray *a = dict[@"files"];
  for(int i=0; i < a.count; i ++) {
      NSString *strName = [NSString stringWithFormat:@"%@",[[dict[@"files"] objectAtIndex:i] valueForKey:@"name"]];
      NSLog(@"str: %@", strName);
      [arr addObject:strName];
   }  
  [arrayPDFName addObject:arr];
}

In numberOfItemsInSection,

return ((NSArray *)arrayPDFName[section]).count;

In cellForRowAtIndexPath,

cell.myLabel.text = arrayPDFName[indexPath.section][indexPath.row];

Do this for section title

1. Have one mutable array as titleArray or something.
2. In viewdidload, titleArray = [NSMutableArray array];

In getdata method,

NSDictionary *dictOriginal = jsonResults[@“white”]; 
[titleArray addObject:[NSString stringWithFormat:@"white(%d)", dictOriginal[@"count"]]];

Do the same for dictOriginal2, dictOriginal3, dictOriginal4.

In viewForSupplementaryElementOfKind,

header.myHeaderLabel.text = titleArray[indexPath.section]

In numberOfSectionsInCollectionView,

-(NSInteger) numberOfSectionsInCollectionView:(UICollectionView *)collectionView { 
  return titleArray.count; 
}

Answer 2

It seems like you might be setting up your collection view before you have any data.

If the log I told you to put in is returning 0, 0, 0, 0 every time, then arrayPDFName is empty.

Try calling [self.collectionView reloadData]; at the end of your getdata method.

If that's not the issue, then there is likely a problem with how you're adding the items to the arrayPDFName array.

EDIT:

Try:

NSArray *arr = [NSArray arrayWithObjects: dictOriginal[@"files"], dictOriginal2[@"files"], dictOriginal3[@"files"], dictOriginal4[@"files"], nil];

EDIT:

You're seeing 4 items in each section because you're returning arrayPDFName.count; in numberOfItemsInSection:.

Instead, you want to return the count of the files inside:

return arrayPDFName[section][@"count"];