Key Value pair Objective-C - ios

Question

so I've been given a task of using a flickr API created by a lecturer, and we have to use it to populate a tableview of a particular user. I'm able to count the number of elements etc, but I can't figure out for the life of me how to actually call the image/photo element of the pair?
This is the code:
- (NSArray *) photosForUser: (NSString *) friendUserName
{
NSString *request = [NSString stringWithFormat: #"https://api.flickr.com/services/rest/?method=flickr.people.findByUsername&username=%#", friendUserName];
NSDictionary *result = [self fetch: request];
NSString *nsid = [result valueForKeyPath: #"user.nsid"];
request = [NSString stringWithFormat: #"https://api.flickr.com/services/rest/?method=flickr.photos.search&per_page=%ld&has_geo=1&user_id=%#&extras=original_format,tags,description,geo,date_upload,owner_name,place_url", (long) self.maximumResults, nsid];
result = [self fetch: request];
return [result valueForKeyPath: #"photos.photo"];
}
What is used to fetch the data:
- (NSDictionary *) fetch: (NSString *) request
{
self.apiKey = #"26225f243655b6eeec8c15d736b58b9a";
NSLog(#"self.APIKey = %#", self.apiKey);
NSString *query = [[NSString stringWithFormat: #"%#&api_key=%#&format=json&nojsoncallback=1", request, self.apiKey]
stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];
NSURL *queryURL = [NSURL URLWithString: query];
NSData *responseData = [NSData dataWithContentsOfURL: queryURL];
if (!responseData)
return nil;
NSError *error = nil;
NSDictionary *jsonContent = [NSJSONSerialization JSONObjectWithData: responseData options: NSJSONReadingMutableContainers error: &error];
if (!jsonContent)
NSLog(#"Could not fetch '%#': %#", request, error);
return jsonContent;
}
Can anyone give me any pointers on how I can actually call the image?
Much appreciated.
edit: this is an NSLog output of what's in the JSON array received from the flickr API.
latestPhotos (
{
accuracy = 16;
context = 0;
dateupload = 1397679575;
description = {
"_content" = "<a href=\"https://www.flickr.com/photos/tanjabarnes/\">
};
farm = 3;
"geo_is_contact" = 0;
"geo_is_family" = 0;
"geo_is_friend" = 0;
"geo_is_public" = 1;
id = 13902059464;
isfamily = 0;
isfriend = 0;
ispublic = 1;
latitude = "34.062214";
longitude = "-118.35862";
owner = "66956608#N06";
ownername = Flickr;
"place_id" = "I78_uSpTWrhPjaINgQ";
secret = cc17afe1b3;
server = 2928;
tags = "panorama losangeles beverlyhills tanjabarnes";
title = blahlbah
woeid = 28288701;
}
)

Answer 1

You need to construct the URL of the image using the ids in your JSON array. Like this:
http://farm{farm-id}.staticflickr.com/{server-id}/{id}_{secret}.jpg
or
http://farm{farm-id}.staticflickr.com/{server-id}/{id}_{secret}_[mstzb].jpg
or
http://farm{farm-id}.staticflickr.com/{server-id}/{id}_{o-secret}_o.(jpg|gif|png)
So in your example:
http://farm3.staticflickr.com/2928/13902059464_cc17afe1b3.jpg
Here's how you get to your images:
NSArray *photos = [self photosForUser:friendUserName];
for(NSDictionary *dictionary in photos) {
NSString *farmId = [dictionary objectForKey:#"farm"];
NSString *serverId = [dictionary objectForKey:#"server"];
NSString *photoId = [dictionary objectForKey:#"id"];
NSString *secret = [dictionary objectForKey:#"secret"];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"http://farm%#.staticflickr.com/%#/%#_%#.jpg", farmId, serverId, photoId, secret]];
UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
// Do something with your image here
}
Reference: https://www.flickr.com/services/api/misc.urls.html