Question

I’m working on a project and I want to be able to handle some template type messages. The template would contain something like:

"{{user1}} has just created an account"

I then have a data map that would give you a location within the NSMutableDictionary where the data is located:

"activity.message.status"

I then want to be able to query the NSMutableDictionary by splitting up that string, so that it becomes something like:

[[[myDictionary objectForKey:@"activity"] objectForKey:@"message"] objectForKey:@"status"]

I could make something as long as it was consistant on being just 3 strings, but some may be more or less.

Any help would be extremely appreciated.

Answer 1

It’s actually much easier than splitting strings into keys. Apples Key-Value-Coding allows exactly what you want.

[myDictionary valueForKeyPath:@"activity.message.status"];

A key path is a string of dot separated keys that is used to specify a sequence of object properties to traverse. The property of the first key in the sequence is relative to the receiver, and each subsequent key is evaluated relative to the value of the previous property.

For example, the key path address.street would get the value of the address property from the receiving object, and then determine the street property relative to the address object.

Key-Value Coding Programming Guide