Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: KVO and the observeValueForKeyPath bottleneck


On 17/07/2006, at 12.38, Jakob Olesen wrote:

- (void)awakeFromNib
{
[myController addObserver:self forKeyPath:@"selectedObjects" options:0 context:@selector(selectionChanged:)];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id) object change:(NSDictionary *)change context:(void *)context
{
if ([self respondsToSelector:(SEL)context])
[self performSelector:(SEL)context withObject:change];
}

Sorry to follow up on myself, but it just occurred to me that the information fits perfectly in an NSNotification:

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id) object change:(NSDictionary *)change context:(void *)context
{
[self performSelector:(SEL)context withObject:[NSNotification notificationWithName:keyPath object:object userInfo:change]];
}

The method you dispatch to is then identical to a notification handler. (You could even use it for both in simple cases)



_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/email@hidden

This email sent to email@hidden
References: 
 >KVO and the observeValueForKeyPath bottleneck (From: Matt Neuburg <email@hidden>)
 >Re: KVO and the observeValueForKeyPath bottleneck (From: Jakob Olesen <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.