Equal strings not equal?

Question

Possible Duplicate:
Understanding NSString comparison in Objective-C

I'v encountered strange things in objective-c, I'm trying to compare cell.label with elements title which is string. to identify whever it is a cell I am looking for.

NSLog(@"%@", cell.textLabel.text);
NSLog(@"%@", [_dropDownSelection1.elements[1] title]);
if(cell.textLabel.text == [_dropDownSelection1.elements[1] title]){
    NSLog(@"Positive");
}
else{
    NSLog(@"Negative");
}

NSLog prints that the text in both is exactly the same, but still i always end up with negative... Why is that?

try using this format `[foo isEqualToString:bar]` for string comparison since yu are comparing the text itself — Jon Taylor, Oct 26 '12 at 07:16

score 3 · Accepted Answer · answered Oct 26 '12 at 07:16

3

You should use [cell.textLabel.text isEqualToString:[_dropDownSelection1.elements[1] title]] to compare the strings.

answered Oct 26 '12 at 07:16

lqs

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strange. tried this way also. But still the result is the same.. NSLog prints both values the same, but comparison gets negative – Datenshi Oct 26 '12 at 07:33
Could you show us what does the NSLog print? – Miguel Isla Oct 26 '12 at 07:45
Everything works now, just added my answer. – Datenshi Oct 26 '12 at 08:10

score 3 · Answer 2 · answered Oct 26 '12 at 07:16

3

You are comparing pointers with one another, not the strings.

Use IsEqual instead.

answered Oct 26 '12 at 07:16

AndersK

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score 1 · Answer 3 · edited Oct 27 '12 at 05:43

1

You can't compare them like that.

See the section Identifying and comparing strings on the Objective-C docs.

edited Oct 27 '12 at 05:43

BoltClock

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answered Oct 26 '12 at 07:16

Rik

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score 0 · Answer 4 · answered Oct 26 '12 at 08:09

Here is the code which worked for me! I don't know why but, without initializing variables i couldn't get it work, even using isEqualToString as provided above.

NSLog(@"CELL:%@", cell.textLabel.text);
NSLog(@"ELEM:%@", [_dropDownSelection1.elements[1] title]);
NSString *labl = cell.textLabel.text;
NSString *tit = [_dropDownSelection1.elements[1] title];

if([labl isEqualToString:tit])
{

    NSLog(@"Positive");
}
else{
    NSLog(@"Negative");

}

score 0 · Answer 5 · edited Oct 26 '12 at 08:57

0

Method for compare two strings is isEqualToString:

Your code is like this

NSLog(@"%@", cell.textLabel.text);
NSLog(@"%@", [_dropDownSelection1.elements[1] title]);

if(cell.textLabel.text isEqualToString:[_dropDownSelection1.elements[1] title])
{
NSLog(@"Positive");
}
else
{
NSLog(@"Negative");
}

edited Oct 26 '12 at 08:57

Rahul Patel

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answered Oct 26 '12 at 08:48

Arvind Kanjariya

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Equal strings not equal?

5 Answers5

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