Re: observing dealloc
Re: observing dealloc
- Subject: Re: observing dealloc
- From: Diederik Hoogenboom <email@hidden>
- Date: Mon, 28 May 2007 19:54:06 +0200
Ken,
Use [object observationInfo] which returns an array with
dictionaries, one for each observer:
e.g.:
<NSCFArray 0x3cacf0>(
<NSKeyValueObservance: Observer: 0x3ba820, Key path: arrangedObjects,
Include old: NO, Include new: NO, Context: 0x0, Property: 0x3be940>,
<NSKeyValueObservance: Observer: 0x3bdca0, Key path:
arrangedObjects.name, Include old: NO, Include new: NO, Context: 0x0,
Property: 0x3ca590>
)
- Diederik
--
Diederik Hoogenboom
Obvious Matter - DiskLibrary for Mac
http://www.obviousmatter.com
On 28-mei-2007, at 19:25, Ken Tozier wrote:
Upon more thought, I could do what I want if there is any way for
an object to get it's list of observers. Is there any way to do that?
On May 28, 2007, at 12:45 PM, Ken Tozier wrote:
On May 28, 2007, at 12:19 PM, Jim Correia wrote:
I think you are going to have to be more specific about what it
is you are trying to do, rather than the mechanics by which you
think you should do it.
In particular, since NSDictionary copies its keys, trying to
observe the object lifetime of the original instance isn't going
to do you any good.
I'm writing a base class and want to include a built in capability
for contextual globals. For example:
@implementation MyObject
NSMutableDictionary *gGlobals = nil;
+ (void) initialize
{
if (gGlobals == nil)
{
gGlobals = [[NSMutableDictionary alloc] init];
}
}
+ (NSMutableDictionary *) globalsForKey:(id) inKey
{
NSMutableDictionary *result = [gGlobals objectForKey: inKey];
if (result == nil)
{
result = [NSMutableDictionary dictionary];
[ gGlobals setObject: result
forKey: inKey];
}
return result;
}
@end
In the above, the key is an object that serves as a context for a
set of globals and when that context disappears, I'd like to
remove all associated globals as well.
On May 28, 2007, at 12:23 PM, Shawn Erickson wrote:
You have two issues. 1) NSDictionary copies keys that you use and
2) NSDictionary holds a retain on those keys (related to issue
1). So dealloc will not get called.
Ah yes, a catch 22.
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