test NSDictionary valueForKey using ISEqualToString

Question

I am using an IF statement to see if the valueForKey is @"T" in my NSDictionary, however i don't think i am accessing the NSDictionary correctly because even when i know the valueForKey is T is never enters the IF statement.

This is what my code looks like:

if ([[getObj valueForKey:@"hasSetID"] isEqualToString:@"T"]) {
        [arrayOfButtonImages addObject:firstButtonImage];
    }

So this if statment is never entered even if it is T.

If any one knows how to test the valueforkey of a NSDictionary it would be greatly appreciated if you could help me with your insight.

`NSArray *keys = [getObj allKeys];` try this and print it, then you will be able to see all keys of **dictionary**. One more thing may be any white space is append with keys so in this case it would not exact equal to `@"T"`. — TheTiger, May 14 '13 at 04:12
do you want to search within the Keys of the Dictionary or get its values? — Ahmed Z., May 14 '13 at 04:14
[This works for me, just like it is supposed to work.](http://ideone.com/DIU6LM) — , May 14 '13 at 04:15
@H2CO3 - He is doing same ..... I think problem is in how he is making the dictionary. — TheTiger, May 14 '13 at 04:19
[getObj valueForKey:@"hasSetID"] instead try with [getObj objectForKey:@"hasSetID"] — Manu, May 14 '13 at 04:19
@VenkatManoharPerepa NO NO NO NO NO, that's what I'm talking about - it's (almost) the same for `NSDictionary`. OP's code **should** work. — , May 14 '13 at 04:19
@VenkatManoharPerepa It would be enough to read the documentation of `NSDictionary` before giving wrong answers based on lazy assumptions. [Read this link](https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDictionary_Class/Reference/Reference.html#//apple_ref/doc/uid/20000140-BBCIBCDJ), it clearly states what the equivalence and the difference is. — , May 14 '13 at 04:22
@TheTiger No, `valueForKey:` is not "better", and it doesn't "work with any class". It has a different use case. — , May 14 '13 at 04:24
@H2CO3: Hold on!!!! Do you know the difference between objectForKey and valueForKey ?? — Manu, May 14 '13 at 04:24
@VenkatManoharPerepa I do, and if you click on the link I provided, you will know it too. (Also, stop duplicating your question marks, one of them is enough.) — , May 14 '13 at 04:25
@JoshCaswell I know because I can NSLog the dictionary and see all the keyValueName = T etc. maybe its not a string? could it be like a bool maybe? or dose every value in a valueforkey of type nsstring? — HurkNburkS, May 14 '13 at 04:25
@TheTiger `valueForKey:` is for accessing KVC-compliant properties. `objectForKey:` is the only method that is usable on `NSDictionary` when the key starts with `@`. Neither one is better than the other, they are to be used in different situations. — , May 14 '13 at 04:27
@HurkNburkS store `[getObj valueForKey:@"hasSetID"]` in `id` and then you can check its class by using `isKindOfClass:` method. — TheTiger, May 14 '13 at 04:29
@TheTiger i wnat to check the string in the valueForKey what do you mean by isKindOfClass — HurkNburkS, May 14 '13 at 04:30
@TheTiger yes, I know how to use it. It shows my NSDictionary and I can look at its keyvalues too. — HurkNburkS, May 14 '13 at 04:35
for(id key in [getObj allKeys]){ id value = [getObj valueForKeykey]; if([value isKindOfClass:[NSString Class]]) NSLog(@"this is a string"); } — TheTiger, May 14 '13 at 04:37

score 1 · Accepted Answer · answered May 14 '13 at 04:22

1

This is supposed to work, and it does indeed. The error is somewhere else. Try logging the contents of your dictionary:

NSLog(@"%@", dict);

to see if the key really is @"hasSetID", and the value is indeed @"T". Don't you have an extra whitespace character in one of them? etc.

answered May 14 '13 at 04:22

i didnt downvote... when i log the NSDictionary I get this { HasASPID = F; firstInfoSetID = F; secondInfoSetID = F; thirdInfoSetID = T; //etc } – HurkNburkS May 14 '13 at 04:28
@HurkNburkS Neither of the keys is `hasSetID` in that. – May 14 '13 at 04:29
Yes both're wrong ..... :) – TheTiger May 14 '13 at 04:30
I didnt downvote too. I wont even do that. – Manu May 14 '13 at 04:30
I didn't downvote too. – TheTiger May 14 '13 at 04:30
@H2CO3 sorry there is a key called hasset its further down its defiantly there i have tested for it by logging it etc. I jsut didnt want to add every valueforkey because there are a few of them.. thats why i added the //etc – HurkNburkS May 14 '13 at 04:32
@HurkNburkS Could you please log that key and the corresponding value character-by-character, after having checked that both of them `isKindOfClass:[NSString class]`? – May 14 '13 at 04:33
I think actually they might be of type booL! I just checked where I am making the NSDictionay.. damnit what an idiot.. how do i test for T or F if I am saving that into a BOOl – HurkNburkS May 14 '13 at 04:38
2

@HurkNburkS If a `BOOL` is stored in an `NSDictionary`, it's generally done by wrapping it in an `NSNumber`. In that case, its descirption is either `0` or `1`, so here you can be sure it's not an `NSNumber` containing a `BOOL`. Log its class using `NSLog(@"%@", [[dict objectForKey:@"hasSetID"] class]);`. – May 14 '13 at 04:41

score 0 · Answer 2 · answered May 14 '13 at 07:18

0

Maybe you can try this one:

if([[yourDictionary allValues]containsObject:@"T"]){
    // Your code here if T is existing
}
else{
    // your code here if its "T" is not existing
}

answered May 14 '13 at 07:18

Joshua

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test NSDictionary valueForKey using ISEqualToString

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