CODEWITHSUNDEEP
objective-cjsonnsdictionary
Daniel Tovesson
Daniel Tovesson

Reputation: 2610

Loop through NSDictionary in key order displayed with NSLog

I'm getting an NSDictionary trough JSON. When doing a NSLog the key order is the following: 40617, 40737, 40946, 41066, 41306. That's the order I want because the values are sorted beforehand. But when looping trough the NSDictionary I get the following order: 40617, 41066, 40737, 40946, 41306. Is it possible to get it in the order I see when I use NSLog?

Upvotes: 0

Views: 952

Answers (3)

Ramaraj T
Ramaraj T

Reputation: 5230

You don't have that option by default. You have to customize.

http://www.cocoawithlove.com/2008/12/ordereddictionary-subclassing-cocoa.html

Upvotes: -1

DarkDust
DarkDust

Reputation: 92394

Dictionaries (maps) are unsorted. There is no guaranteed order when you iterate them. You're only guaranteed to get all entries.

So you need to get the keys, sort them in a way you want, and then get the values for your sorted keys.

For example:

NSArray *keys = [myDictionary allKeys];
NSArray *sortedKeys = [keys sortedArrayUsingSelector:@selector(compare:)];

for (id key in sortedKeys) {
    id value = [myDictionary objectForKey:key];

    NSLog(@"%@ = %@", key, value);
}

Upvotes: 4

Antonio MG
Antonio MG

Reputation: 20410

The NSDictionary is not ordered by definition, so when you add the values, they don't have to be the same order all the time. If you want an ordered collection you should use a NSArray

Upvotes: 2

Related Questions