Compare two strings in obj-c

Question

Possible Duplicate:
If “a == b” is false when comparing two NSString objects?

Simple Question of comparing 2 strings:

if (string1 == string2)
{
    NSLog(@"it is equal!");
}

thats it but it wont work for me it is always != i testet it with string2 = string1; but it wont work.

so i tested if (string1 isEqualToString:string2) but in that case there is a syntax error

Thanks for any help!

Regards Curtis

score 2 · Accepted Answer · answered Dec 05 '12 at 16:15

2

== compares the address of the objects, not their content. Two different objects will obviously never have the same address.

To compare strings use NSString's isEqualToString: method:

if ([string1 isEqualToString:string2]) {
    NSLog(@"it is equal");
}

Note the square brackets [ ]. This is the proper Objective-C syntax for sending messages (i.e. calling functions).

To generally compare object in regards to their content, use isEqual:.

answered Dec 05 '12 at 16:15

DrummerB

Member for 2.5 years, and you've never seen this duplicate before? – jrturton Dec 05 '12 at 16:21
@jrturton He was missing the `[ ]`. If anything, I'd consider this "too localized", rather then a duplicate. – DrummerB Dec 05 '12 at 16:28
you saved my day iam really new to Obj-c. I found so many answers to my coding problems and again I love the Community! – CTSchmidt Dec 05 '12 at 16:30

score 1 · Answer 2 · answered Dec 05 '12 at 16:15

1

Use if ([url isEqualToString:turl]). It is the correct syntax, with the [] you mark that you are sending a message to the object.

answered Dec 05 '12 at 16:15

Dave

2 Answers2