On Sep 11, 2012, at 10:06 AM, Motti Shneor <[email protected]> wrote:
> OK. Could you spare some pseudo-code for this? Or some link to a known
> code-sample? or maybe some 10 highlight lines from your own utilities?
>
> Documentation on method swizzling isn't that easy to use. In my case, all I
> need to do is to "swizzle?" (like override) the "addObserver" of my observed
> object, and record the high-level observation info (observer, options,
> context, etc.) in some static container, so I can later question the observed
> object about its observer.
>
> But how do I do that on my NSManagedObject sublcass?
Sorry about the delayed response. I have been buried in work. I switched to
10.8 Mountain Lion and I am still adjusting to the revised Mail applicaiton.
You could do swizzling like this.
#import "JRSwizzle.h"
@implementation NSManagedObject (MySpecialCategory)
// Do the swizzling
+ (void)load
{
@autoreleasepool // NSAssert requires an autorelease pool
{
NSError *error = nil;
[[NSObject class] jr_swizzleMethod:@selector(method)
withMethod:@selector(my_swizzled_method)
error:&error];
NSAssert(error == nil, @"%@", error);
}
}
// Framework method
// - (void)method
// {
// ...
// }
// Swizzled method
- (void)my_swizzled_method
{
// do your thing
// call original implementation
[self my_swizzled_method];
}
@end
Note that the NSManagedObject documentation indicates "As with any class, you
are strongly discouraged from overriding the key-value observing methods". I
view swizzling like this: You are at your wits end, you have examined all other
options, you want to use Apple's frameworks but you simply can figure out any
other way. So you try swizzling.
--Richard Somers
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