On 5 May 2006, at 19:53, Vaisburd, Haim wrote:
Hi,
I would like to override a method of an existing class.
One way is to create a category and define a method
with the same name, e.g.
@interface NSBitmapImageRep (MyCategory)
- destroy;
@end
Is there any way to call the original method
within the implementation of my override,
in this case the original [NSBitmapImageRep-destroy] ?
No.
Or not simply anyway.
What you can do is put your new implementation in a loadable bundle,
then get the method implementation before loading that bundle.
eg.
// This is the code in the bundle
@implementation NSBitmapImageRep (MyCategory)
static IMP old;
+ (void) setOldImplementation: (IMP)imp
{
old = imp;
}
- (void) destroy
{
// new code here
(*old)(self, @selector(destroy)); // Invoke old implementation
}
@end
// And this is the code to set it up
IMP oldMethod = [NSBitmapImageRep instancemethodForSelector: @selector
(destroy)];
// load bundle here
[NSBitmapImageRep setOldImplementation: oldMethod];
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