Now that I have the NSDictionary object JSONDictionary, how do I get the nested data inside of it?
NSString *JSONFilePath = [[NSBundle mainBundle] pathForResource:#"sAPI" ofType:#"json"];
NSData *JSONData = [NSData dataWithContentsOfFile:JSONFilePath];
NSDictionary *JSONDictionary = [NSJSONSerialization JSONObjectWithData:JSONData options:kNilOptions error:nil];
NSLog(#"Dictionary: %#", JSONDictionary);
sAPI.json snippet:
{
"ss": [{
"name": "bl",
},
"ls": [{
"name": "ML",
"abbreviation": "ml",
"id": 10,
Since you asked me to do this in a comment on a different answer, I'll answer it here. To get the name value of one of the leagues, follow this
NSDictionary *JSONDictionary = [NSJSONSerialization JSONObjectWithData:JSONData options:kNilOptions error:nil]; //root object
NSArray *sports = JSONDictionary[#"sports"]; //array containing all sports (baseball, football, etc.)
NSDictionary *baseball = sports[0]; //dictionary containing info about baseball
NSArray *baseballLeagues = baseball[#"leagues"]; //array containing all leagues for baseball
NSDictionary *MLB = baseballLeagues[0]; //dictionary for only the MLB league
NSString *MLBName = MLB[#"name"]; //the full name of the MLB
This example only works for the MLB, but can easily be changed by finding the index of the other league or sport you want to use.
Note that the square brackets used in this answer are shorthand for the following methods
dictionary[#"key"]; -short for-> [dictionary objectForKey:#"key"];
array[0]; -short for-> [array objectAtIndex:0];
Related
Can anybody help me create an NSDictionary format of the following structure:
{
key1 = "value1";
key2 = "value2";
key3 = [
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
},
{
key01 = "value01";
key02 = "value02";
}
];
}
Try this code it might help you.
NSDictionary *dicationary = #{
#"key1":#"value1",
#"key2":#"value2",
#"key3":#[#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"},
#{#"key01":#"value01",#"key02":#"value02"}]
};
There is API in obj-c to convert Json to nsdictionary .I guess you should try that :
First convert json to nsdata (assuming you above JSON is in string format)
2.Then you API to convert that to NSDictionary :
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
Just to answer your question about converting that JSON data to NSDictionary, here it is:
(assuming you already got your JSON data)
// add the first 2 VALUES with it's KEYS
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:VALUE1 forKey:KEY1];
[mainDict setValue:VALUE2 forKey:KEY2];
// then for the last KEY, create a mutable array where you will store your sub dictionaries
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY1];
[subDict setValue:SUB_VALUE1 forKey:SUB_KEY2];
[ma addObject:subDict];
// then add that array to your main dictionary
[mainDict setValue:ma forKey:KEY3];
// check the output
NSLog(#"mainDict : %#", mainDict);
// SAMPLE DATA - Test this if this is what you want
NSMutableDictionary *mainDict = [NSMutableDictionary dictionary];
[mainDict setValue:#"value1" forKey:#"key1"];
[mainDict setValue:#"value2" forKey:#"key2"];
NSMutableArray *ma = [NSMutableArray array];
NSMutableDictionary *subDict = [NSMutableDictionary dictionary];
[subDict setValue:#"subValue1" forKey:#"subKey1"];
[subDict setValue:#"subValue2" forKey:#"subKey2"];
[ma addObject:subDict];
[mainDict setValue:ma forKey:#"key3"];
NSLog(#"mainDict : %#", mainDict);
The following should work for you:
NSString *jsonString = #"{\"ID\":{\"Content\":268,\"type\":\"text\"}}";
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"%#", jsonDict[#"ID"][#"Content"]);
Will return you:
268
I need to parse a JSON array in the following format:
[
{
name: "10-701 machine learning",
_id: "52537480b97d2d9117000001",
__v: 0,
ctime: "2013-10-08T02:57:04.977Z"
},
{
name: "15-213 computer systems",
_id: "525616b7807f01fa17000001",
__v: 0,
ctime: "2013-10-10T02:53:43.776Z"
}
]
So after getting the NSData, I transfer it to a NSDictionary:
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSLog(#"%#", dict);
But viewing from the console, I think the dictionary is actually like this:
(
{
"__v" = 0;
"_id" = 52537480b97d2d9117000001;
ctime = "2013-10-08T02:57:04.977Z";
name = "10-701 machine learning";
},
{
"__v" = 0;
"_id" = 525616b7807f01fa17000001;
ctime = "2013-10-10T02:53:43.776Z";
name = "15-213 computer systems";
}
)
What do those parenthesis in the outside mean? How should I further transfer this NSDictionary to an NSArray or an NSMutableArray of some Course objects (what I defined myself, try to represent each element of the JSON array)?
Use this code,
NSArray *array = [NSJSONSerialization JSONObjectWithData: responseData options:NSJSONReadingMutableContainers error:&error];
NSDictionary *dict = [array objectAtIndex:0];
Then you can retrieve the values by following code,
NSString *v = [dict objectForKey:#"__v"];
NSString *id = [dict objectForKey:#"_id"];
NSString *ctime = [dict objectForKey:#"ctime"];
NSString *name = [dict objectForKey:#"name"];
The parenthesis are just the result of NSDictionary output format not being exactly the same thing as how JSON is formatted. Your code still successfully converted the JSON into a NSDictionary object.
I think what you really want, though, is an array of dictionaries. Something like this:
NSArray *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSDictionary *firstObject = [json objectAtIndex:0];
After this, firstObject would contain:
{
"__v" = 0;
"_id" = 52537480b97d2d9117000001;
"ctime" = "2013-10-08T02:57:04.977Z";
"name" = "10-701 machine learning";
}
And you can retrieve the information with objectForKey:
NSString *time = [firstObject objectForKey:#"ctime"];
// time = "2013-10-08T02:57:04.977Z"
Hope that helps.
I have a json like this:
{ "fwdTrackGeom": "MULTILINESTRING ((56.307041507017 58.011219723083, 56.307961164317 58.010033333358, 56.308853999526 58.008881008358), (56.308853999526 58.008881008358, 56.309011612988 58.008414442093, 56.309042139956 58.008156999171, 56.309008293909 58.007831344383, 56.308806969015 58.007403489114, 56.308573457613 58.007075104002, 56.307891858088 58.006361480718, 56.306619854144 58.004996722377))" }
I make a string with
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSString *path = [json objectForKey:#"fwdTrackGeom"];
And now I need to make CLLocationCoordinate2D from path. Who can explain how do this?
I get this JSON from a web service:
{
"Respons": [{
"status": "101",
"uid": "0"
}]
}
I have tried to access the data with the following:
NSError* error;
//Response is a NSArray declared in header file.
self.response = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSString *test = [[self.response objectAtIndex:0] objectForKey:#"status"]; //[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance
NSString *test = [[self.response objectForKey:#"status"] objectAtIndex:0]; //(null)
But none of them work, if i NSLog the NSArray holding the serialized data, this i what i get:
{
Respons = (
{
status = 105;
uid = 0;
}
);
}
How do i access the data?
Your JSON represents a dictionary, for whom the value associated with the Respons key is an array. And that array has a single object, itself a dictionary. And that dictionary has two keys, status and uid.
So, for example, if you wanted to extract the status, I believe you need:
NSArray *array = [self.response objectForKey:#"Respons"];
NSDictionary *dictionary = [array objectAtIndex:0];
NSString *status = [dictionary objectForKey:#"status"];
Or, in latest versions of the compiler:
NSArray *array = self.response[#"Respons"];
NSDictionary *dictionary = array[0];
NSString *status = dictionary[#"status"];
Or, more concisely:
NSString *status = self.response[#"Respons"][0][#"status"];
Your top level object isn't an array, it's a dictionary. You can easily bypass this and add the contents of that key to your array.
self.response = [[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error] objectForKey:#"Respons"];
I have a simple json format with an array within an array, but I can't figure out how to get the inner array. How do I grab the "Commute" tag as an NSArray or a NSDictionary?
Here is my json:
{
"Language": "EN",
"Place": [
{
"City": "Stockholm",
"Name": "Slussen",
"Commute": [
"Subway",
"Bus"
]
},
{
"City": "Gothenburg",
"Name": "Central station",
"Commute": [
"Train",
"Bus"
]
}
]
}
Here is my code:
NSString *textPath = [[NSBundle mainBundle] pathForResource:#"Places" ofType:#"json"];
NSError *error;
NSString *content = [NSString stringWithContentsOfFile:textPath encoding:NSUTF8StringEncoding error:&error]; //error checking omitted
NSData *jsonData = [content dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:jsonData
options:kNilOptions
error:&error];
NSArray* AllPlaces = [json objectForKey:#"Place"];
for(int n = 0; n < [AllPlaces count]; n++)
{
PlaceItem* item = [[PlaceItem alloc]init];
NSDictionary* place = [AllPlaces objectAtIndex:n];
item.City = [place objectForKey:#"City"];
item.Name = [place objectForKey:#"Name"];
NSDictionary* commutes = [json objectForKey:#"Commute"];
[self.placeArray addObject:(item)];
}
Your code should be:
NSArray* commutes = [place objectForKey:#"Commute"];
Thwt would give back an array holding "Subway" and "Bus".
I think the problem is the access to json, it should be place instead:
NSArray* commutes = [place objectForKey:#"Commute"];
NSArray *commutes = [place objectForKey:#"Commute"];
This will give you an NSArray with "Subway" and "Bus".
You can considerably shrink you code using KVC Collection Operators:
NSArray *commutes = [json valueForKeyPath:#"Place.#distinctUnionOfArrays.Commute"];
If you want all repeated commutes use #unionOfArrays modifier.