Yes, you cannot use UIButton's as keys in a dictionary, because keys in a dictionary are copied, and buttons are not copyable.
Here's the better question: what are you trying to do? Using buttons as keys in a dictionary seems... odd. Cheers, Dave On May 11, 2010, at 2:36 PM, Alejandro Marcos Aragón wrote: > Hi all, > > I'm new to Cocoa, and I couldn't find information about an error that I'm > getting on the web. I'm trying to create an NSMutableDictionary where the > keys are of type UIButton*: > > > // create button for unit > UIButton* unitButton = [[UIButton alloc] init]; > [sourceButtonMap setObject:[NSString > stringWithString:@"no"] forKey:unitButton]; > > Of course, the sourceButtonMap is defined in the class and initialized in the > init function as sourceButtonMap = [[NSMutableDictionary alloc] init]; > > The error I get when I try to add the key-value pair is: > > *** Terminating app due to uncaught exception 'NSInvalidArgumentException', > reason: '*** -[UIButton copyWithZone:]: unrecognized selector sent to > instance 0x3931e90' > > Is this happening because I can't store UIButton* as keys? > Can anyone point me why I'm getting this error? Thank you all, > > aa
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