How to determine if strings are equal in Objective C?

Question

I read a string from a JSON result as follows:

NSString *strResult = [[NSString alloc] initWithBytes:[data bytes] 
                                               length:[data length] 
                                             encoding:NSUTF8StringEncoding];

I then try to determine if the string is equal to the value "N"

if ([strResult isEqualToString:@"N"])
{ 
  [lblImageOK setHidden:YES]; 
} 
else 
{ 
  [lblImageOk setHidden:NO]; 
}

The if statement allways returns the else part, even though the result is "N". They both have the same value but the statement returns false always.

Can you NSLog(@"%@",strResult); before your if statement and add the output to your question? — Stenerson
– Stenerson, Commented Mar 27, 2012 at 22:36
Make it NSLog(@"[%@] len=%d, strResult, [strResult length]); for good measure. — peterept
– peterept, Commented Mar 27, 2012 at 22:43
as peterept suggests, you almost certainly have leading or trailing spaces. — Rob Napier
– Rob Napier, Commented Mar 27, 2012 at 23:56

Angie · Accepted Answer · 2012-03-28 14:18:47Z

9

I found a way to clean the string and then check if they are equal.

NSString *strResult = [[NSString alloc] initWithBytes:[data bytes] 
                                           length:[data length] 
                                         encoding:NSUTF8StringEncoding]; 

strResult = [strResult stringByReplacingOccurrencesOfString:@"\"" withString:@""];
strResult = [strResult stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

if ([strResult isEqualToString:@"N"])
{ 
  [lblImageOK setHidden:YES]; 
} 
else 
{ 
  [lblImageOk setHidden:NO]; 
}

answered Mar 28, 2012 at 14:18

Angie

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