Parsing data from googleapi - ios

Question

I'm trying to build an app that uses data from this url: http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=8&q=http%3A%2F%2Fnews.google.com%2Fnews%3Foutput%3Drss
So far, I'm downloading it with this:
- (void) downloadData {
NSString *url = #"http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=8&q=http%3A%2F%2Fnews.google.com%2Fnews%3Foutput%3Drss";
// Create NSUrlSession
NSURLSession *session = [NSURLSession sharedSession];
// Create data download taks
[[session dataTaskWithURL:[NSURL URLWithString:url]
completionHandler:^(NSData *data,NSURLResponse *response,NSError *error) {
NSError *jsonError;
self.issueData = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&jsonError];
// Log the data for debugging
NSLog(#"DownloadedData:%#",self.issueData);
// Use dispatch_async to update the table on the main thread
// Remember that NSURLSession is downloading in the background
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
}] resume];
}
and trying to insert it into my table view cells with this:
- (CustomTableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"customTableViewCell" forIndexPath:indexPath];
NSLog(#"Working on cell:%ld",(long)indexPath.row);
NSDictionary *thread = [self.issueData objectAtIndex:indexPath.row];
cell.title.text = [thread objectForKey:#"description"];
cell.date.text = [thread objectForKey:#"publishedDate"];
cell.content.text = [thread objectForKey:#"contentSnippet"];
return cell;
Anyone know what I'm doing wrong?

Answer 1

Your top level object for json is not array so
NSDictionary *thread = [self.issueData objectAtIndex:indexPath.row]; this will not work. You top level object is dictionary so parsing will be as
(CustomTableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"customTableViewCell" forIndexPath:indexPath];
NSLog(#"Working on cell:%ld",(long)indexPath.row);
NSDictionary *thread = [self.issueData objectForKey:#"responseData"];
NSDictionary *feed = [thread objectForKey:#"feed"];
cell.title.text = [feed objectForKey:#"description"];
NSArray *entries = [feed objectForKey:#"entries"];
NSDictionary *posts = entries[indexPath.row];
cell.date.text = [posts objectForKey:#"publishedDate"];
cell.content.text = [posts objectForKey:#"contentSnippet"];
return cell;
}

Answer 2

I guess right way for parsing it as follow's
- (void) downloadData {
NSString *url = #"http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=8&q=http%3A%2F%2Fnews.google.com%2Fnews%3Foutput%3Drss";
// Create NSUrlSession
NSURLSession *session = [NSURLSession sharedSession];
// Create data download taks
[[session dataTaskWithURL:[NSURL URLWithString:url]
completionHandler:^(NSData *data,NSURLResponse *response,NSError *error) {
NSError *jsonError;
NSDictionary * dict;
dict= [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments
error:&jsonError];
dispatch_async(dispatch_get_main_queue(), ^{
if ([dict valueForKey:#"responseData"]) {
if([[dict valueForKey:#"responseData"] isKindOfClass:[NSDictionary class]]){
if ([(NSDictionary *)[dict valueForKey:#"responseData"] valueForKey:#"feed"]) {
if ([[(NSDictionary *)[dict valueForKey:#"responseData"] valueForKey:#"feed"]isKindOfClass:[NSDictionary class]]) {
NSDictionary * feedDict = [(NSDictionary *)[dict valueForKey:#"responseData"] valueForKey:#"feed"];
if ([feedDict valueForKey:#"description"]){
NSLog(#"%#",[feedDict valueForKey:#"description"]);
}
if ([[feedDict valueForKey:#"entries"] isKindOfClass:[NSArray class]]){
for (NSDictionary * dic in (NSArray *)[feedDict valueForKey:#"entries"]) {
NSLog(#"published = %#",[dic valueForKey:#"publishedDate"]);
}
}
if ([[feedDict valueForKey:#"entries"] isKindOfClass:[NSArray class]] ){
for (NSDictionary * dic in (NSArray *)[feedDict valueForKey:#"entries"]) {
NSLog(#"contentSnippet = %#",[dic valueForKey:#"contentSnippet"]);
}
}
}
}
}
}
});
}] resume];}
I just logged the required keys to console you can add them to arrays and use them anywhere you want.