iphone - How to check for existence of a key in plist? -

I'm trying to check the existence of a key in a plist file in Xcode. This is the structure in my plast file. Root (dictionary) + - parent (key) - key 1 (boolean) - key 2 (boolean) - key 3 (boolean) - key 4 (boolean) + - parent 2 (Dictionary) - key 1 (boolean) - key 2 (boolean)

Now I have to check whether Key2 is present in parent1 or not? I tested NSDictionary but how can I do that?

Any suggestions on how to do this?

  NSDRIVATION * dict = [NSDiction dictionary with contentofffile: @ "yours.plist"]; BOOL key 2Exists = [[Dick ObjectForcae: @ "Parent 1"] ObjectForcae: @ "Key2"]! = Zero;  

For obvious zero comparison, I sometimes use it because it makes the code more readable to me (it reminds me that The variable statement on the left is a boolean). I have also seen a clear "boolean cast":

  BOOL key2Exists === [[dict objectForKey: @ "parent1"] objectForKey: @ "key2"];  

I think this is a matter of personal priority.