Sectioned UITableView with JSON Array

[iShanty]

Hi guys,
this is my first post, so... first of all, I introduce myself. I'm programming Objective-C for iPhone SDK since one month, so.... take a little patience...

I have one problem tryin' to section a tableview.

I have a JSON string with a format like this:

{
"Clients": [
"Section": "A",
"Clients": [
{
"Id": 136,
"Referencia": "CL0146",
"RazonSocial": "AIR-FAL, S.L.",
"CIF": "B50110253",
"Provincia": "Zaragoza",
"Localidad": "VILLANUEVA DE GALLEGO"
},
{
"Id": 54,
"Referencia": "CL0051",
"RazonSocial": "AKI BRICOLAJE ESPAÑA S.L.",
"CIF": "B83985713",
"Provincia": "Barcelona",
"Localidad": "BARBERÀ DEL VALLÈS"
},
.
.
.
.
.

Of course, I have a MutableArray for every Client and every section filled in ViewDidLoad. I think everything are worked but numberOfRowsInSection.

I mean, I hardcode numberOfRowsInSection returning 1 if section == 0, and tableview shows first section well, so I think 2 arrays are well formed.

Now, the problem is that implementation of numberOfRowsInSection is

return [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:section]] count];

And always return 0.

I don't know what I'm doing wrong, any suggest please.

Thanks.

[BrianSlick]

I realize that packing a whole lot of stuff into a single line of code seems cool, but it makes reading and troubleshooting your code very difficult. So the first thing you should do is split things into multiple lines, like so:

NSArray *allKeys = [[self sections] allKeys];
NSArray *sortedKeys = [allKeys sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
NSString *key = [sortedKeys objectAtIndex:section];
NSArray *sectionContents = [[self sections] objectForKey:key];
NSInteger numberOfRows = [sectionContents count];

Sure, it is more lines of code. So what? This is much more readable, much easier to understand, and now you have more logging opportunities:

NSArray *allKeys = [[self sections] allKeys];
NSLog(@"allKeys is: %@", [allKeys description]);
NSArray *sortedKeys = [allKeys sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
NSLog(@"sortedKeys is: %@", [sortedKeys description]);
NSString *key = [sortedKeys objectAtIndex:section];
NSLog(@"key is: %@", key);
NSArray *sectionContents = [[self sections] objectForKey:key];
NSLog(@"sectionContents is: %@", [sectionContents description]);
NSInteger numberOfRows = [sectionContents count];
NSLog(@"numberOfRows is: %d", numberOfRows)

So now you can ask questions of your own code and figure out where things are going wrong.

[iShanty]

Ok, you're right. Doin' it by your way I found that the problem is

NSArray *sectionContents = [self.sections objectForKey:key];

In ViewDidLoad, I filled sections by that way

//c is the name of the section (only one char)
[self.sections setValue:[[NSMutableArray alloc] init] forKey:c];

So, sections has data correctly, but I don't understand why when I ask for the object for 'A' key for example, the result is an empty array.

[BrianSlick]

[self.sections setValue:[[NSMutableArray alloc] init] forKey:c];

1. All this does is create an array. The array doesn't have any contents.

2. The array is leaked.

[iShanty]

I'm vey confused.
BrianSlick, you're right again. Now I have other problems... I think that I choose a wrong way to construct JSON string for a sectioned tableview.

I think the best way is include Section node as subnode os every client, so I have only one array in the response.

What do you think??

Thank you very much.