Parsing json incorrect

Question

i'm parsing something from the Apple JSON (the rating of the app) and i tried something like:

 if ([StoreParse objectForKey:@"averageUserRating"] == @"4.5") {
        NSLog(@"xx");
    } else {
        NSLog(@"xxx");
    }

The App has a rating of 4.5 and if i do

NSlog (@"%@", [StoreParse objectForKey:@"averageUserRating"]);

The output is : 4.5

but when i run the script the NSlog in the first code's output is "xxx" does anyone can help me?

score 6 · Answer 1 · answered May 12 '12 at 21:17

Comparing strings, which are essentially pointers to instances of the NSSring class, is erroneous, as two identical-content strings can have a different memory address. Use

if ([[StoreParse objectForKey:@"averageUserRating"] isEqualToString:@"4.5"])

instead.

score 4 · Answer 2 · edited May 23 '17 at 11:56

You can't do this:

if ([StoreParse objectForKey:@"averageUserRating"] == @"4.5")

You need to do:

if ([[StoreParse objectForKey:@"averageUserRating"] isEqualToString:@"4.5"])

That's assuming it's a string. If it's an NSNumber then do:

if ([[StoreParse objectForKey:@"averageUserRating"] floatValue] == 4.5f)

(Although be careful about comparing equality of floats)

See this question for more information on string equality.

score 4 · Answer 3 · answered May 12 '12 at 21:11

4

Use isEqualToString:

if ([[StoreParse objectForKey:@"averageUserRating"] isEqualToString:@"4.5"]) {
    NSLog(@"xx");
}

answered May 12 '12 at 21:11

Mark Byers

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score 0 · Answer 4 · answered May 14 '12 at 01:57

If the value for averageUserRating is an NSNumber, you should convert it to a formatted NSString first then compare it to the @"4.5" string literal:

if ([[NSString stringWithFormat:@"%1.1f", [[StoreParse objectForKey:@"averageUserRating"] floatValue]] isEqualToString:@"4.5"])

Parsing json incorrect

4 Answers4