iOS "simple" (?) string-comparison problem

[Danneman101]

Ive got a little codesnippet where Im trying to compare a string with another.

Even though writing out the myTitle-variable in the alertbox will in fact display the string ("HELLO") that Im comparing it with (tried it by removing the if-statement and just executing the alert-box), the if-statement wont equate myTitle to the string.

Is this due to some inconsistency between datatypes, perhaps? I mean, they are both strings, arent they, and thus should be comparable?

	NSString *myTitle = level2ViewController.title;
	if(myTitle == @"HELLO")
	{
			// Display alert
			UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"Title:" message:myTitle delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
			[myAlert show];
			[myAlert release];

	}

 

[jnic]

== compares pointers, not the strings themselves. You want:

[myTitle isEqualToString:@"HELLO"]

which returns true if the strings are equal.

 

[caveman_uk]

The same is true of all objects not just strings. You cannot compare the contents using '==' you must use an isEqualToxxxx: method.

 

[Danneman101]

Thanks you guys I guess Im still stuck in the world of C++/C#. Wow, objc is VERY different..

 

[dejo]

Thanks you guys I guess Im still stuck in the world of C++/C#. Wow, objc is VERY different..

You can compare strings using == in C++/C#?

 

[ChrisA]

Thanks you guys I guess Im still stuck in the world of C++/C#. Wow, objc is VERY different..

Not that different. In plain old Ansi C the == thing would fail for the same reason.

 

[kalimba]

You can compare strings using == in C++/C#?

If you overload the '==' operator, you can.