you need to override automaticallyNotifiesObserversForKey: to return
NO for @"selectedIndex"
see:
http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/KeyValueObserving/Articles/KVOCompliance.html
if you observe an object, the runtime automatically generates the
willChange/didChange unless you override this method to return NO.
basically you're sending extra willChange/didChange calls here as it is.
-aaron
At 6:28 PM -0700 4/9/12, Rick Mann wrote:
I'm observing a property of one of my classes, "selectedIndex". Even
if the value is set to the same value, KVO fires and my observe
method gets called, which is something I thought by default it
doesn't do.
So I implemented a custom setter for my property, like this:
- (void)
setSelectedIndex: (NSUInteger) inIndex
{
if (mSelectedIndex == inIndex)
{
return;
}
[self willChangeValueForKey: @"selectedIndex"];
mSelectedIndex = inIndex;
[self didChangeValueForKey: @"selectedIndex"];
}
Sure enough, my method returns early, but KVO still gets called.
What am I misunderstanding?
Thanks,
Rick
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