Question

I’m using NSJSONSerialization JSONObjectWithData:options:error: in an iOS 5 project to read a JSON string and convert it to a Foundation object. Is there an easy way to find out if the object or some of its children are arrays, dictionaries, numbers or strings?

Answer 1

You can check to see if the returned object is a certain class with the -isKindOfClass: method. For example, to check if it’s an array:

id jsonObj = [NSJSONSerialization JSONObjectWithData:...]
if ([jsonObj isKindOfClass:[NSArray class]] {
    // Do array stuff...
}

Similarly for the other foundation types.