Objective C: comparing dictionary contents - objective-c

Question

I have a dictionary declared, like this,
NSString *responseString = [request responseString];
responseDict = [responseString JSONValue];
for (id key in responseDict){
NSLog(#"%# : %#", key, [responseDict objectForKey:key]);
}
Result :
013-01-22 00:14:02.323 PromoTest[2352:c07] A : 0
2013-01-22 00:14:02.325 PromoTest[2352:c07] B : 1
2013-01-22 00:14:02.325 PromoTest[2352:c07] C : 0
now, I want to compare the value and do some operation on it. I presumed the value for a key is of type NSString and compared it to my constant NSString, like this,
NSString *myString1 = #"0";
NSString *myString2 = [responseDict objectForKey:#"A"];
NSLog(#"%d", (myString1 == myString2)); //1
NSLog(#"%d", [myString1 isEqualToString:myString2]); //1
Result:
2013-01-22 00:19:12.966 PromoTest[2423:c07] 0
2013-01-22 00:19:12.966 PromoTest[2423:c07] 0
Where am i going wrong?? Is my comparison wrong? How do I go about correctly comparing the content??
The data is being received as response data from a web service. I am just converting the data into a dictionary for easily using it. The web service returns a JSON object,
{"A":0,"B":1,"C":0}

Answer 1

NSDictionary method isEqualToDictionary can be used to compare 2 dictionaries
Returns a Boolean value that indicates whether the contents of the
receiving dictionary are equal to the contents of another given
dictionary.
For example:
[myDictionary isEqualToDictionary:expectedDictionary]

Answer 2

The only reasonable explanation is that [responseDict objectForKey:#"A"] is not returning a NSString.
You are probably getting a NSNumber back, therefore the comparison fails.
If that's the case you need to get a NSString from the NSNumber before comparing it against your constant. You can do it by
NSString * myString2 = [[responseDict objectForKey:#"A"] stringValue];
Also never use == to compare NSStrings instances. Stick with isEqualToString and you'll be good.

Answer 3

Instead of comparing strings you could also compare number object. here including with a check, if the returned object is a NSNumber, if not, try as string:
if([responseDict[#"A"] isKindOfClass:[NSNumber class]]){
NSNumber *myNumber1 = #0;
NSNumber *myNumber2 = [responseDict objectForKey:#"A"];
NSLog("Same number: %#",[myNumber1 isEqualToNumber:myNumber2] ? #"YES" : #"NO");
} else if([responseDict[#"A"] isKindOfClass:[NSString class]]){
NSString *myString1 = #"0";
NSString *myString2 = [responseDict objectForKey:#"A"];
NSLog("Same string: %#",[myString1 isEqualToString:myString2] ? #"YES" : #"NO");
}