JSON String with Arrays iOS - ios

Question

My APP gets a JSON string from a api call JSON string has objects and a array in it. This is what i have done so far but i couldn't get the values from it . advice me please and I'm new to iOS .This is my JSON String :
{
"Id":"0d95a9f6-c763-4a31-ac6c-e22be9832c83",
"Name":"john",
"ProjectName":"project1",
"StartDate":"\/Date(1447200000000)\/",
"Documents":
[{
"Id":"2222a","Name":"book1","ContentType":"application/pdf"
},
{
"Id":"3718e","Name":"Toolbox","ContentType":"application/fillform"
}]
}
Code
NSString *URLString = [NSString stringWithFormat:#"http://mysite/API/Assignments?"];
NSURL *url = [NSURL URLWithString:URLString];
NSData *data=[NSData dataWithContentsOfURL:url];
json=[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
assignArray=[[NSMutableArray alloc]init];
for (int i=0; i<json.count; i++) {
NSString *aID=[[json objectAtIndex:i]objectForKey:#"Id"];
NSString *uName=[[json objectAtIndex:i]objectForKey:#"Name"];
NSString *pName=[[json objectAtIndex:i]objectForKey:#"ProjectName"];
//[self initwithUserID:uID userName:uName proName:pName];
// [self retrieveAssignmentDetails:aID];
AssignmentsJson *assignment=[[AssignmentsJson alloc]initwithassignID:aID userName:uName proName:pName];
[assignArray addObject:assignment];

Answer 1

your json is not array so parse like following
NSString *aID = json[#"Id"];
NSString *uName = json[#"Name"];
NSString *pName = json[#"ProjectName"];
NSString *startDate = json[#"StartDate"];
NSArray *documents = json[#"Documents"];
for (NSDictionary *item in documents) {
NSString *itemID = item[#"Id"];
NSString *itemName = item[#"Name"];
NSString *itemContentType = item[#"ContentType"];
}

Answer 2

Your Json Object is NSDictionary. so you can directly get data using valueForKey
NSDictionary *json=[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSString *aID = json[#"Id"];
NSString *uName = json[#"Name"];
NSString *pName = json[#"ProjectName"];
for Id,Name and ContentType is inside your array object within your NSDictionary object.
so you can get those values accessing array index.
NSArray *arr = json[#"Documents"];
for (int i=0; i<arr.count; i++) {
NSString *aID=[[arr objectAtIndex:i]objectForKey:#"Id"];
NSString *uName=[[arr objectAtIndex:i]objectForKey:#"Name"];
NSString *cType=[[arr objectAtIndex:i]objectForKey:#"ContentType"];
}
You should learn NSArray and NSDictionary Structure first. it will help you in future. Hope this will help you.

Answer 3

you can do it by following way.
Your Json is in NSDictionary format.
NSData * data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://mysite/API/Assignments?"]];
NSDictionary * dicResponse = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
if(dicResponse){
NSString * strID = [dicResponse valueForKey:#"Id"];
NSString * strName = [dicResponse valueForKey:#"Name"];
NSString * strProjectName = [dicResponse valueForKey:#"ProjectName"];
NSString * strDate = [dicResponse valueForKey:#"StartDate"];
NSArray * arrDocuments = [NSArray arrayWithArray:[dicResponse valueForKey:#"Documents"]];
for (int i=0; i< arrDocuments.count; i++) {
NSString * ID=[[arrDocuments objectAtIndex:i]valueForKey:#"Id"];
NSString * Name=[[arrDocuments objectAtIndex:i]valueForKey:#"Name"];
NSString * Type=[[arrDocuments objectAtIndex:i]valueForKey:#"ContentType"];
}
}