Get back data after Json parsing - ios

Question

In my iOS app I've to parse a JSON file. From this JSON I need the following stuff: name, image width and image height. To get image name I'ven't any problem, to get image with and height I use the following code:
- (void) loadImageFromWeb:(NSString *)urlImg forName:(NSString*)name {
NSURL* url = [NSURL URLWithString:urlImg];
//NSURLRequest* request = [NSURLRequest requestWithURL:url];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
NSString *authCredentials =#"reply:reply";
NSString *authValue = [NSString stringWithFormat:#"Basic %#",[authCredentials base64EncodedStringWithWrapWidth:0]];
[request setValue:authValue forHTTPHeaderField:#"Authorization"];
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse * response,
NSData * data,
NSError * error) {
if (!error){
UIImage* image = [[UIImage alloc] initWithData:data];
imageWidth = image.size.width;
imageHeight = image.size.height;
imgWidth = [NSString stringWithFormat:#"%f", imageWidth];
imgHeight = [NSString stringWithFormat:#"%f", imageHeight];
self.dictWithDataForPSCollectionView = #{#"title": name,
#"width": imgWidth,
#"height": imgHeight};
[self.arrayWithData addObject:self.dictWithDataForPSCollectionView];
NSLog(#"DATA ARRAY: %#", self.arrayWithData);
} else {
NSLog(#"ERRORE: %#", error);
}
}];
}
You can see that I save the name, image width and image height in a NSDictionary then I put this in an NSMutableArray. When it execute the NSLog, I see this:
DATA ARRAY: (
{
height = "512.000000";
title = "Eau de Toilet";
width = "320.000000";
},
{
height = "1049.000000";
title = "Eau de Toilet";
width = "1405.000000";
}
)
My question is how to get this information back in the class who call my json parser, I tried to access to the variable in this way:
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
recivedData = [[NSMutableData alloc]init];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[recivedData appendData:data];
NSString *string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"JSON: %#", string);
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *json;
NSError *err;
json = [NSJSONSerialization JSONObjectWithData:recivedData options:NSJSONReadingMutableLeaves error:&err];
JsonCategoryReader *reader = [[JsonCategoryReader alloc]init];
[reader parseJson:json];
}
But when I run the code it shows me an empty array. How I can have the information in this class?
UPDATE:
The JSON I've to parse is the following:
{
"1":{
"entity_id":"1",
"type_id":"simple",
"sku":"EAU_DE_TOILET_1",
"description":"A passionate scent with the zest of exclusive Zegna Bergamot, sparked by Violettyne Captive, and the warmth of Vetiver and Cedarwood",
"short_description":"EAU DE TOILETTE NATURAL SPRAY",
"meta_keyword":null,
"name":"Eau de Toilet",
"meta_title":null,
"meta_description":null,
"regular_price_with_tax":60,
"regular_price_without_tax":60,
"final_price_with_tax":60,
"final_price_without_tax":60,
"is_saleable":true,
"image_url":"http:\/\/54.204.6.246\/magento8\/media\/catalog\/product\/cache\/0\/image\/9df78eab33525d08d6e5fb8d27136e95\/p\/r\/product_100ml.png"
},
"2":{
"entity_id":"2",
"type_id":"simple",
"sku":"EAU_DE_TOILET_2",
"description":"A passionate scent with the zest of exclusive Zegna Bergamot, sparked by Violettyne Captive, and the warmth of Vetiver and Cedarwood",
"short_description":"EAU DE TOILETTE NATURAL SPRAY",
"meta_keyword":null,
"name":"Eau de Toilet",
"meta_title":null,
"meta_description":null,
"regular_price_with_tax":60,
"regular_price_without_tax":60,
"final_price_with_tax":60,
"final_price_without_tax":60,
"is_saleable":true,
"image_url":"http:\/\/54.204.6.246\/magento8\/media\/catalog\/product\/cache\/0\/image\/9df78eab33525d08d6e5fb8d27136e95\/s\/c\/scheda_non_shop.jpg"
}
}
My method parseJson do the following:
- (void)parseJson:(NSDictionary *)jsonDict {
// Controllo che il json sia stato ricevuto
if (jsonDict) {
self.nameArray = [[NSMutableArray alloc]init];
self.imgUrlArray = [[NSMutableArray alloc]init];
self.dictWithDataForPSCollectionView = [[NSDictionary alloc]init];
self.arrayWithData = [[NSMutableArray alloc]init];
[self createArrayWithJson:jsonDict andIndex:1];
[self createArrayWithJson:jsonDict andIndex:2];
}
- (void)createArrayWithJson:(NSDictionary*)json andIndex:(NSString*)i {
NSDictionary *products = [json objectForKey:i];
NSString *name = [products objectForKey:#"name"];
NSString *imgUrl = [products objectForKey:#"image_url"];
// Scarico l'immagine e calcolo le dimensioni
if (name != nil && imgUrl != nil) {
[self loadImageFromWeb:imgUrl forName:name];
}
}
I hope you understand what I did

Answer 1

what happen is that your class is make before that your json is download, for have a good sequence you have to call your method for parse the json inside the completionHandler block, when you are sure that it is download. then when you have your object load you can parse it like this example:
for (NSDictionary *dic in reader.arrayWithData){
NSLog("height: %#",[dic objectForKey:#"height"]);
NSLog("title: %#",[dic objectForKey:#"title"]);
NSLog("width: %#",[dic objectForKey:#"width"]);
}