Hello,
I've the following situation: I have 3 UIScrollViews in an app. The first is
like a table (centerTable). The second a row (firstRow) and the last a column
(firstColumn). The column must scroll only in vertical, the row only in
horizontal and the table in any direction. And the movement must be
synchronized between then. So, for example, if I scroll the table, the row and
the column scrolls with the same offset.
Using KVO, I added the row and the column as observers of the contentOffset
from table:
[centerTable addObserver:firstColumn
forKeyPath:@"contentOffset"options:NSKeyValueObservingOptionNew context:NULL];
[centerTable addObserver:firstRow
forKeyPath:@"contentOffset"options:NSKeyValueObservingOptionNew context:NULL];
And added in classes from row/column the method:
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary*)change context:(void *)context {
if ([keyPath isEqualToString:@"contentOffset"]) {
CGPoint newContentOffset = [(UIScrollView *)object contentOffset];
newContentOffset.y = self.contentOffset.y;
self.contentOffset = newContentOffset;
}
}
With this is almost OK, and the row/cloumn moves acordingly as table scrolls.
But after I add the table as observer of contentOffset from row/column with:
Isso está funcionando belezinha. Mas ao adicionar a tabela como observadora da
propriedade contentOffset da linha/coluna:
[firstColumn addObserver:centerTable
forKeyPath:@"contentOffset"options:NSKeyValueObservingOptionNew context:NULL];
[firstRow addObserver:centerTable
forKeyPath:@"contentOffset"options:NSKeyValueObservingOptionNew context:NULL];
and implement observeValueForKeyPath:ofObject:change:context: in table class,
whenever I try to scroll any of the UIScrollView, the program abort. I think
that I made a loop, and when I update one of the contenOffset, the other views
receive the message, update it self contentOffset and send the message for the
others...
Has someone a sugestion of how to solve this?
Thank you
Tales Pinheiro_______________________________________________
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