Thank you for the answer. It just worked!
About the notes:
1.: should I just check if the object is different from self? Or some more
"complicated"? And what should I check as keyPath?
2.: if I send a context parameter from observer (the context can be a NSString
for example, right?), should I chech if the string is expected? And I only
should call super if the context is invalid? Reading Apple documentation I saw
that I should ever call super, but when I did it, the app crashed (I did not
went look what was wrong. Should I or it's not really necessary?)
Sorry, but I'm pretty new with KVO. I'm just read the KVO quick star guide and
KVO programming guide.
Em 20/06/2011, às 02:58, Quincey Morris escreveu:
On Jun 19, 2011, at 11:59, Tales Pinheiro de Andrade wrote:
if ([keyPath isEqualToString:@"contentOffset"]) {
CGPoint newContentOffset = [(UIScrollView *)object contentOffset];
newContentOffset.y = self.contentOffset.y;
self.contentOffset = newContentOffset;
}
It may be as simple as changing the above pattern to this pattern:
if ([keyPath isEqualToString:@"contentOffset"]) {
CGPoint newContentOffset = [(UIScrollView *)object contentOffset];
newContentOffset.y = self.contentOffset.y;
if (!CGPointEqualToPoint (self.contentOffset, newContentOffset))
self.contentOffset = newContentOffset;
}
But note:
1. You should really check the object (at least its class) as well as the
keyPath.
2. You should really use a context parameter that's unique for your
observations, and call super if the context isn't what you expect.
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