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iOS

Posted by David Brown
David Brown
1,152 Points

Extra Credit JSON Google search

After completing the iOS Getting Data from the web badge, I had a go at the extra credit.

I edited the NSURL *blogURL to point at the address @"https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=JSON" and edited the objectForKey to point at one of the keys coming from the JSON data, I selected the key, "results". I then created an NSLog of dataDictionary to see if I was accessing the correct data and the google data all appears within the output window successfully.

My problem is after editing the cell.textLabel.text = [blogPost valueForKey:@""]; and selecting one of the string keys from the google JSON data and running the app I have empty cells within my app.

Help!

Thanks

7 Answers

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

If you look at the JSON data. The key "results" is within "responseData". You first need to access "responseData" and store it in a dictionary and from that "responseData" dictionary access the "results".

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

Your problem is that you are not passing a key

cell.textLabel.text = [blogPost valueForKey:@""];

Try specifying a key. For example: titleNoFormatting

cell.textLabel.text = [blogPost valueForKey:@"titleNoFormatting"];
David Brown
David Brown
1,152 Points
David Brown
David Brown
1,152 Points

Hi Amit,

Thanks for the reply. Perhaps by example was a little misleading, I am actually used the key @"results", but still don't have any cells populated with data.

Thanks

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

Can you paste some more of your code? It still doesn't make a whole lot of sense because "results" will give you an array.

David Brown
David Brown
1,152 Points
David Brown
David Brown
1,152 Points

Of course, code below

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSURL *blogURL = [NSURL       URLWithString:@"https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=JSON"];

    NSData *jsonData = [NSData dataWithContentsOfURL:blogURL];

    NSError *error = nil;

    NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData
                                                                   options:0
                                                                     error:&error];

    self.blogPosts = [dataDictionary objectForKey:@"results"];
    NSLog(@"%@",dataDictionary);
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    NSDictionary *blogPost = [self.blogPosts objectAtIndex:indexPath.row];

    cell.textLabel.text = [blogPost valueForKey:@"title"];
    cell.detailTextLabel.text = [blogPost valueForKey:@"visibleUrl"];


    return cell;
}

Thanks

David Brown
David Brown
1,152 Points
David Brown
David Brown
1,152 Points

As "cursor" and "results" are not contained within square brackets which I understood to indicate an array, I thought I'd be able to access the "results" key directly as with "posts" from the treehouse JSON data, obviously not. I'll give it a go and let you know how I get on.

Thanks again

Benjamin Harrison
Benjamin Harrison
4,784 Points
Benjamin Harrison
Benjamin Harrison
4,784 Points

I was having the exact same trouble (base problem and confused by lack of [] as well) and your explanation worked for me.

Thanks, Amit.