Why isn't this instance variable being recognized?

Question

In my .h:

@class PanelController;

@interface PanelController : NSWindowController <NSWindowDelegate>
{
    NSURL *zURL;
}

@property (nonatomic, assign) NSURL *zURL;

@end

In my .m:

@synthesize zURL;

...

- (IBAction)openBrowser:(id)sender {
    self.zUrl = [zOpenPanel URL];
}

Error:

zURL not found on object PanelController

Is there a typo in the code block? You wrote "self.zUrl" which is != "self.zURL" if that's what you meant. The error string has zURL which implies something's wrong. — Ben Zotto
– Ben Zotto, Commented Aug 31, 2011 at 22:14

Pontus Granström · Accepted Answer · 2011-08-31 23:08:38Z

10

Because Objective-C is case sensitive.

You use self.zUrl but it should be self.zURL.

(Also, the instance variable declaration might be unnecessary if you declare a property.)

edited Aug 31, 2011 at 23:08

answered Aug 31, 2011 at 22:14

Pontus Granström

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2 Comments

Wevah Over a year ago

It's still necessary under 32-bit OS X, IIRC.

Wevah Over a year ago

(Addendum: it's necessary under the old runtime (32-bit OS X) if you're not implementing the property method(s) yourself, as it doesn't support synthesized ivars.)

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