Question

I have a Cocoa-Application in which I have a NSMutableArray which contains instances of an NSImageView subclass.

What I am trying to do is to get the minimum value for the x value of the ImageViews bounds origin.

I have tried:

double minx =[[robots valueForKeyPath:@"@min.bounds.origin.x"] doubleValue];

as well as:

double minx =[[robots valueForKeyPath:@"@min.self.bounds.origin.x"] doubleValue];

However I get the following error:

[<NSConcreteValue 0x100597a20> valueForUndefinedKey:]: this class is not key value coding-compliant for the key origin.

I have searched the internet and the NSKeyValueCoding Protocol Reference, but I didn’t find a solution for my problem. I know that I could just loop through the NSMutableArray, but using valueForKeyPath would be the better way I guess.

Answer 1

The error is because NSRect (the returned value from [NSImageView bounds]) is a simple struct and not an Objective-C object.

I would recommend subclassing NSImageView and exposing those values as properties so that they are Key Value Coding-Compliant.