Set NSString with returned JSON value - ios

Question

I'm trying to set my imageView with the url returned in the JSON data below in "value" (secondLink). When I use the following code, it returns the entire block in JSON through my XCode console - what should my code look like if I ONLY want the image's URL to be returned (right now, I assume it's trying to set the imageView with EVERYTHING returned in secondLink)?
ViewController.m
NSString *secondLink = [[[[DIOSSession sharedSession] user] objectForKey:#"field_photo_path"] objectForKey:#"safe_value"];
NSLog(#"This is second link %#", secondLink);
if([secondLink length]>0) {
NSString *ImageURL = secondLink;
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:ImageURL]];
self.imageView.image = [UIImage imageWithData:imageData];
} else {
NSString *ImageURL = #"defaulturl.com";
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:ImageURL]];
self.imageView.image = [UIImage imageWithData:imageData];
}
JSON data
{
und = (
{
format = "<null>";
"safe_value" = "http://myurl.com/sites/default/files/stored/photo.jpg";
value = "http://myurl.com/sites/default/files/stored/photo.jpg";
}
);
}

Answer 1

In field_photo_path there is a dictionary und which contains an array.
The first item in the array is a dictionary containing the key safe_value.
It assumes that user is also a dictionary (at least it responds to objectForKey:)
NSDictionary *user = [[DIOSSession sharedSession] user];
NSString *secondLink = user[#"field_photo_path"][#"und"][0][#"safe_value"];