Re: Warning: type 'id <NSTextAttachmentCell>' does not conform to the 'NSCopying' protocol
Re: Warning: type 'id <NSTextAttachmentCell>' does not conform to the 'NSCopying' protocol
- Subject: Re: Warning: type 'id <NSTextAttachmentCell>' does not conform to the 'NSCopying' protocol
- From: Jean-Daniel Dupas <email@hidden>
- Date: Wed, 19 Dec 2007 18:51:44 +0100
Le 19 déc. 07 à 18:15, John Stiles a écrit :
id<NSTextAttachmentCell> refers to a protocol named
NSTextAttachmentCell, which does not conform to NSCopying.
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Protocols/NSTextAttachmentCell_Protocol/Reference/Reference.html
NSTextAttachmentCell* refers to a class named NSTextAttachmentCell,
which does conform to NSCopying (by virtue of being an NSCell
subclass).
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSTextAttachmentCell_Class/Reference/Reference.html
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSCell_Class/Reference/NSCell.html
So the compiler is warning you that you are effectively casting from
a type that does not conform to NSCopying, to a type that does
conform to NSCopying.
It's hard to say whether this is a problem or not. If the object
really is of the NSTextAttachmentCell class, there is probably
nothing to worry about.
In addition to what John says, if are sure that the cell is a
NSTextAttachmentCell (and it is in your case), you can safely cast it
to avoid compiler warning:
NSTextAttachmentCell *cell = (NSTextAttachmentCell *)[attachment
attachmentCell]; // <-- warning here
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