How to Parse Nested Dictionary JSON Data in iOS? - ios

Question

i am newbie in iOS Development. i want to parse my this JSON Data into to array First array Contain all Data and Second array Contain only -demopage: array Value.
status: "success",
-data: [
{
mid: "5",
name: "October 2014",
front_image: "http://www.truemanindiamagazine.com/webservice/magazineimage/frontimage/01.jpg",
title: "October 2014",
release_date: "2014-10-01",
short_description: "As the name suggest itself “Trueman India” will cover icons of India. Our national Magazine “Trueman India” is an expansion to our business, i",
current_issue: 0,
-demopage: [
{
link: "http://www.truemanindiamagazine.com/webservice/magazineimage/pageimage/2014/10/01-1413806104.jpg",
page_no: "1"
},
{
link: "http://www.truemanindiamagazine.com/webservice/magazineimage/pageimage/2014/10/2-1413806131.jpg",
page_no: "2"
},
{
link: "http://www.truemanindiamagazine.com/webservice/magazineimage/pageimage/2014/10/3-1413806170.jpg",
page_no: "3"
}
]
}
]
Here my main Dictionary Key is data i want data keey value in my One array and demopage key value in to another array here my two Array is self.imageArray and self.imagesa here my code For that
- (void)viewDidLoad
{
[super viewDidLoad];
[self.collectionView registerNib:[UINib nibWithNibName:#"CustumCell" bundle:nil] forCellWithReuseIdentifier:#"CellIdentifier"];
dispatch_async(kBgQueue, ^{
data = [NSData dataWithContentsOfURL: imgURL];
[self performSelectorOnMainThread:#selector(fetchedData:) withObject:data waitUntilDone:YES];
});
}
-(void)fetchedData:(NSData *)responsedata
{
NSMutableArray *imagesArray = [[NSMutableArray alloc]init];
if (responsedata.length > 0)
{
NSError* error;
self.json = [NSJSONSerialization JSONObjectWithData:responsedata options:kNilOptions error:&error];
if ([[_json objectForKey:#"data"] isKindOfClass:[NSArray class]])
{
NSArray *arr = (NSArray *)[_json objectForKey:#"data"];
[self.imageArray addObjectsFromArray:arr];
[self.storeTable reloadData];
}
self.storeTable.hidden=FALSE;
for (index=0; index<[self.imageArray count]; index++)
{
for(NSDictionary *dict in self.imageArray)
{
imagesArray = [dict valueForKey:#"demopage"];
self.imagesa = imagesArray;
}
NSLog(#"New Demo page array %#",self.imagesa);
}
}
then i get my data key value and it is ok but i got only last index means here my -data key Contain three -demopage key and i get only last -demopage key value i want all -demopage key value in to self.imagesa please give me solution for that.
also my Webservices link is Link

Answer 1

First get -data in NSMutableArray.
NSMutableArray *dataArray = [[NSMutableArray alloc]init];
NSMutableArray *imagesArray = [[NSMutableArray alloc]init];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responsedata options:kNilOptions error:&error];
dataArray=[json objectForKey:#"data"];
for(NSDictionary *dict in dataArray )
{
imagesArray = [dict valueForKey:#"demopage"];
self.imagesa = imagesArray;
}
[selt.tableView reloadData];

Answer 2

You can give it a try like this:
NSError* error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responsedata options:kNilOptions error:&error];
NSDictionary *dataDict = [json objectForKey:#"data"];
NSArray *imageArray = [dataDict objectForKey:#"demopage"];
self.imagesa = [NSMutableArray array];
for (NSDictionary *dict in array) {
NSString *imageUrl = [dict objectForKey:#"link"];
[self.imagesa addObject:imageUrl];
}
Then you got imageArray as dataSource for the collectionView.

Answer 3

I would use SBJson library, but not the last 4th version:
pod 'SBJson', '3.2'
Sample code, I changed variable names and formatting a little bit:
// Create a JSON String from NSData
NSData *responseData = [NSData new]; // Here you should use your responseData
NSString *jsonString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
if (! jsonString ) {
// Handle errors
}
// Create SBJsonParser instance
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
// Parse JSON String to dictionary
NSDictionary *jsonDic = [jsonParser objectWithString:jsonString];
// Get an array by key
NSArray *dicArray = [jsonDic objectForKey:#"demopage"];
// Reload collection view
if ( [dicArray count] > 0 ) {
dispatch_async(dispatch_get_main_queue(), ^{
// Reload Your Collection View Here and use dicArray (in your case imagesa array with dictionaries)
});
}
And when you set a cell, you can use something like this:
NSDictionary *dic = dicArray[indexPath.row];
NSString *link = dic[#"link"];
NSString *pageNo = dic[#"page_no"];