Getting error while converting Json data to Object in iOS - ios

Question

I am using an API to convert Json Data into Object data,
please visit the API I am using
Please Visit the API page which I am using
Here is the snap of my code with highlighted issues
Issues
and here is the raw code
-(void) retrieveData{
NSURL * url = [NSURLURLWithString:getDataUrl];
NSData * data = [NSData dataWithContentsOfURL:url];
jsonArray = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:nil];
NSLog(#"JsonArray %#", jsonArray);
//setup yougaArray
yougaArray = [[NSMutableArray alloc] init];
//Loop through our jsonArray
for (int i = 0; i<jsonArray.count; i++)
{
NSString * yId = [[[[jsonArray objectAtIndex:i]objectForKey:#"data"]objectAtIndex:#"categories"]objectForKey:#"id"];
// NSString * yId = [[jsonArray objectAtIndex:i]objectForKey:#"id"];
NSString * yName = [[[[jsonArray objectAtIndex:i]objectForKey:#"data"]objectAtIndex:#"categories"]objectForKey:#"name"];
NSString * yDescription = [[[[jsonArray objectAtIndex:i]objectForKey:#"data"]objectAtIndex:#"categories"]objectForKey:#"description"];
NSString * yImage = [[[[jsonArray objectAtIndex:i]objectForKey:#"data"]objectAtIndex:#"categories"]objectForKey:#"image"];
//Add the city object to our citiesArray
[yougaArray addObject:[[Youga alloc]initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]];
}
[self.tableView reloadData];
}

Answer 1

Thanks #Lame, I followed your code, as it was giving me 6 to 8 errors, but I understand your code & configured error in that now here is the complete solution which works according to my requirements or (perfect answer according to my asked question)
-(void) retrieveData{
NSURL * url = [NSURL URLWithString:getDataUrl];
NSData * data = [NSData dataWithContentsOfURL:url];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSDictionary *dataJSON = [jsonDict objectForKey:#"data"];
NSArray *allCategoriesJSON = [dataJSON objectForKey:#"categories"];
yougaArray = [[NSMutableArray alloc] init];
for (int i = 0; i < allCategoriesJSON.count; i ++)
{
NSDictionary *aCategoryJSON = [allCategoriesJSON objectAtIndex:i];
NSString *yId = [aCategoryJSON objectForKey:#"id"];
NSString *yName = [aCategoryJSON objectForKey:#"name"];
NSString *yDescription = [aCategoryJSON objectForKey:#"description"];
NSString *yImage = [aCategoryJSON objectForKey:#"image"];
[yougaArray addObject:[[Youga alloc] initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]];
}
[self.tableView reloadData];

Answer 2

According to your JSON response its a Dictionary type object not an array so your code should be like this,
NSMutableDictionary *dictData = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:nil];
NSLog(#"JsonArray %#", dictData);
NSArray *jsonArray=[[dictData objectForKey:#"data"] objectForKey:#"categories"];
//setup yougaArray
yougaArray = [[NSMutableArray alloc] init];
for (int i = 0; i<jsonArray.count; i++)
{
NSString * yId = [[jsonArray objectAtIndex:i] objectForKey:#"id"];
// NSString * yId = [[jsonArray objectAtIndex:i]objectForKey:#"id"];
NSString * yName = [[jsonArray objectAtIndex:i] objectForKey:#"name"];
NSString * yDescription = [[jsonArray objectAtIndex:i] objectForKey:#"description"];
NSString * yImage = [[jsonArray objectAtIndex:i] objectForKey:#"image"];
//Add the city object to our citiesArray
[yougaArray addObject:[[Youga alloc]initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]];
}
[self.tableView reloadData];
Hope it works for you. Let me know!!
Happy coding. :)

Answer 3

You JSON seems like this :
{
"meta": {
"status": "200",
"msg": "OK"
},
"data": {
"total_pages": 0,
"total_categories": 2,
"current_page": 1,
"next_page": 0,
"categories": [{
"id": "2",
"name": "Articles",
"description": "Yoga Articles",
"image": "http:\/\/yoga.lifehealthinfo.com\/uploads\/images\/50_50\/86289272image86289272.jpg"
}, {
"id": "1",
"name": "Poses",
"description": "Yoga Poses",
"image": "http:\/\/yoga.lifehealthinfo.com\/uploads\/images\/50_50\/86289272image86289272.jpg"
}]
}
}
now replace your existing code with the code below:
NSData * data = [NSData dataWithContentsOfURL:url];
jsonArray = [NSJSONSerialization JSONObjectWithData:data options: kNilOptions error:nil];
NSLog(#"JsonArray %#", jsonArray);
//setup yougaArray
yougaArray = [[NSMutableArray alloc] init];
//Loop through our jsonArray
NSArray *dataArray = [[jsonArray objectForKey#"data"] objectForKey:#"categories"];
for (int i = 0; i < dataArray.count; i++) {
NSString * yId = [[dataArray objectAtIndex:i] objectForKey:#"id"];
NSString * yName = [[dataArray objectAtIndex:i] objectForKey:#"name"];
NSString * yDescription = [[dataArray objectAtIndex:i] objectForKey:#"description"];
NSString * yImage = [[dataArray objectAtIndex:i] objectForKey:#"image"];
//Add the city object to our citiesArray
[yougaArray addObject:[[Youga alloc]initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]];
}
[self.tableView reloadData];
Let me know if the solution works for you, also if anything comes up.

Answer 4

This is the JSON:
{
"meta": {
"status": "200",
"msg": "OK"
},
"data": {
"total_pages": 0,
"total_categories": 2,
"current_page": 1,
"next_page": 0,
"categories": [{
"id": "2",
"name": "Articles",
"description": "Yoga Articles",
"image": "http:\/\/yoga.lifehealthinfo.com\/uploads\/images\/50_50\/86289272image86289272.jpg"
}, {
"id": "1",
"name": "Poses",
"description": "Yoga Poses",
"image": "http:\/\/yoga.lifehealthinfo.com\/uploads\/images\/50_50\/86289272image86289272.jpg"
}]
}
}
Your JSON is a NSDictionary at top level! Not a NSArray!
Also, avoid doing all objectForKey:/objectAtIndex: in the same line/instruction, it's harder to read, but also harder to debug, especially when you don't know what you are doing.
Also, when there is an error parameter, use it, don't put nil.
So:
NSError *errorJSON = nil;
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&errorJSON];
if (errorJSON)
{
NSLog(#"ErrorJSON: %#", errorJSON);
return;
}
NSDictionary *dataJSON = [jsonDict objectForKey:#"data"];
NSArray *allCategoriesJSON = [dataJSON objectForKey:#"categories"];
for (NSUIInteger i = 0; i < allCategoriesJSON.count; i ++)
{
NSDictionary *aCategoryJSON = [allCategoriesJSON objectAtIndex:i];
NSString yID = [aCategoryJSON objectForKey:#"id"];
NSString yName = [aCategoryJSON objectForKey:#"name"];
NSString yDescription = [aCategoryJSON objectForKey:#"description"];
NSString yImage = [aCategoryJSON objectForKey:#"image"];
[yougaArray addObject:[[Youga alloc] initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]];
}