Parse a JSON array of dictionaries in a tableview - iphone

Question

I'm stuck at the point of parsing a JSON array of dicts (http://www.cjs-design.nl/json.php) into a tableview. I just want to display the title's first, ill figure out detailviews later.
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
NSString *rawJson = [[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://www.cjs-design.nl/json.php"]];
// No connection or file not found
if ([rawJson length] == 0) {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Foutmelding" message:#"De URL kon niet worden gevonden" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
[rawJson release];
return;
}
SBJSON *parser = [[[SBJSON alloc] init] autorelease];
// 1. get the top level value as a dictionary
NSDictionary *jsonObject = [parser objectWithString:rawJson error:NULL];
// 2. get the object as an array
NSArray *list = [jsonObject objectForKey:#"book"];
// 3. iterate the array; each element is a dictionary.
for (NSDictionary *book in list)
{
// that contains a string for the key "title"
NSString *title = [book objectForKey:#"title"];
cell.textLabel.text = title;
}
return cell;
}

Answer 1

Somewhere i.e. viewDidLoad, you need to parse your JSON. Then implement UITableView's dataSource methods.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [list count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CellIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
NSDictionary *book = [list objectAtIndex:indexPath.row];
NSString *title = [book objectForKey:#"title"];
cell.titleLabel.text = title;
}

Answer 2

- (void)viewDidLoad
{
[super viewDidLoad];
NSString *rawJson = [[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://www.cjs-design.nl/json.php"]];
// No connection or file not found
if ([rawJson length] == 0) {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Foutmelding" message:#"De URL kon niet worden gevonden" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
[rawJson release];
return;
}
SBJsonParser *parser = [[SBJsonParser alloc] init];
// 1. get the top level value as a dictionary
NSDictionary *jsonObject = [parser objectWithString:rawJson error:NULL];
NSLog(#"Dict: %#",jsonObject);
list = [jsonObject objectForKey:#"book"];
NSLog(#"List: %#",list);
[rawJson release];
}
When I NSlog them, they both print Null, so the string doesnt get parsed? the string contains a dictionary of arrays tho.