Convert JSON array to Objective-C in iOS - ios

Question

I am new to iOS development. I am trying to covert JSOn array values to Objective-C values. My JSON values are like this:
{"result":
[{"alternative":
[{"transcript":"4"},
{"transcript":"four"},
{"transcript":"so"},
{"transcript":"who"}],
"final":true}],
"result_index":0}
I have tried it this way:
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray= [speechResult valueForKey:#"result"];
NSLog(#"%#",speechArray);
NSLog(#"Response is of type: %#", [speechArray class]);
speechArray is always null. How to resolvee this problem?
At the same time I would like to print transcript values.

Answer 1

I think the problem might be in initializing the array and Dictionary.
Try doing this,
NSDictionary *speechResult = [NSDictionary new];
NSArray *speechArray = [NSArray new];
Hope it helps..

Answer 2

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];//data is your response from server as NSData
if ([json isKindOfClass:[NSDictionary class]]){ //Added instrospection as suggested in comment.
NSArray * speechArray = json[#"result"];
}
NSLog(#"speech array %#",speechArray);

Answer 3

Did you check the value in NSDictionary (speechResult).
If it is nil, check the json data isValid or not.
NSError *error;
if ([NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error] == nil)
{
// Check the error here
}else {
// here check whether it is a dictionary and it has key like #Bhadresh Mulsaniya mentioned.
}
If returns nil, then you check the error to understand what's wrong.

Answer 4

try this may be it will help you:-
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult = [NSDictionary new];
speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray = [[NSArray alloc]init];
speechArray= [speechResult valueForKey:#"result"];
NSLog(#"%#",speechArray);
NSLog(#"Response is of type: %#", [speechArray class]);

Answer 5

try this code,
restaurantdictionary = [NSJSONSerialization JSONObjectWithData:mutableData options:NSJSONReadingMutableContainers error:&e];
NSMutableArray *main_array=[[NSMutableArray alloc]init];
main_array=[restaurantdictionary valueForKey:#"results"];
NSLog(#"main_array %#", main_array);
its working for me, hope its helpful

Answer 6

You have to initialize the array before using it,
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:speechrequestString]];
NSError *error;
NSDictionary *speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray= [[NSArray alloc] init];
speechArray= [speechResult valueForKey:#"result"];
if (speechArray.count>0) {
NSDictionary * alternativeDictn = [speechArray objectAtIndex:0];
NSArray *alternativeAry= [[NSArray alloc] init];
alternativeAry = [alternativeDictn objectForKey:#"alternative"];
NSLog(#"%#",alternativeAry);
}
NSLog(#"Response is of type: %#", [speechArray class]);
Using this code you will get following result,
(
{
transcript = 4;
},
{
transcript = four;
},
{
transcript = so;
},
{
transcript = who;
}
)

Answer 7

Try out the below code to get the transcripts:
NSData* jsonData = [yourJsonString dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *responseObj = [NSJSONSerialization
JSONObjectWithData:jsonData
options:0
error:&error];
if(! error) {
NSArray *responseArray = [responseObj objectForKey:#"result"];
for (NSDictionary *alternative in responseArray) {
NSArray *altArray = [alternative objectForKey:#"alternative"];
for (NSDictionary *transcript in altArray) {
NSLog(#"transcript : %#",[transcript objectForKey:#"transcript"]);
}
}
} else {
NSLog(#"Error in parsing JSON");
}

Answer 8

You should alloc your dictionary first like this-
NSDictionary *speechResult = [[NSDictionary alloc]init];
speechResult= [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *speechArray = [[NSArray alloc]init];
speechArray= [speechResult valueForKey:#"result"];