ios development - How to do JSON parser? - ios

Question

I'm new to ios development. Now I get a JSON file from server.
I use NSDictionary to get objects. When I debug, I could get "name", "address" values.
But I don't know how can I get all "dish" elements from "recommendation" Object? In java development, I know recommendation is an object, and "dish" is an array element. But I don't know what happen in ios.
{
"results": [
{
"name": "ollise",
"address": "columbia university",
"geo": [
{
"coordinates": 40
},
{
"coordinates": 70
}
],
"logo": "http:\/\/a0.twimg.com\/profile_images\/3159758591\/1548f0b16181c0ea890c71b3a55653f7_normal.jpeg",
"recommendation": [
{
"dish": "dish1"
},
{
"dish": "dish2"
}
],
}
]
}
By the way, in JSON, I store URL of an image in "logo", but I cannot get the value when debugging. Should I use some special format?
[Restaurant setname:[Dict objectForKey:#"name"]] // I could get name
[Restaurant setlogo:[Dict objectForKey:#"logo"]] // I can get nothing!

Answer 1

This is the way to do it
NSDictionary *response = [NSJSONSerialization JSONObjectWithData:yourData options:NSJSONReadingMutableLeaves error:nil];
NSDictionary *results = [[response objectForKey:#"results"] objectAtIndex:0];
NSString *name = [response objectForKey:#"name"];
//... get other objects
NSArray *recommendation = [results objectForKey:#"recommendation"];
NSDictionary *recommendation1 = [recommendation objectAtIndex:0];
NSDictionary *recommendation2 = [recommendation objectAtIndex:1];
NSString *dish = [recommendation1 objectForKey#"dish"];
NSString *dish1 = [recommendation2 objectForKey#"dish"];
[Restaurant setname:name];
NSString *logo = [results objectForKey:#"logo"];
[Restaurant setlogo:logo];
The results is the same dictionary as the one in the JSON. Treat anything with braces ({}) as an NSDictionary and brackets ([]) as an NSArray. dish is not an array element, it is a key in a dictionary that is an array element.