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POHow to let UIScrollView invoke scrollViewDidScroll, when contentSize is decreased
 

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  1. POHow to let UIScrollView invoke scrollViewDidScroll, when contentSize is decreased
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    <p>I have a dynamic UITableView, which will insert and delete rows when clicking button.</p> <pre><code>-(IBAction)foldingClicked:(id)sender { self.isInfoFolded = !self.isInfoFolded; if( self.isInfoFolded) { //self.mainTable remove rows }else { //self.mainTable insert rows } } </code></pre> <p>and I did some animation in <code>scrollViewDidScroll:</code></p> <pre><code>-(void)scrollViewDidScroll:(UIScrollView*)scrollView { CGFloat main_offset = scrollView.contentOffset.y; //animation CGRect image_frame = self.imageView.frame; if((main_offset &gt;= 0 ) &amp;&amp; (main_offset &lt;= self.imageView.frame.size.height)) { image_frame.origin.y = main_offset/2; }else { image_frame.origin.y = image_frame.size.height/2; } } </code></pre> <p>It mostly works fine. But when I </p> <ol> <li>click button to insert rows. ( the tableView contentSize increase )</li> <li>Scroll table view to a big offset.</li> <li>click button to delete rows. ( the tableView contentSize decrease )</li> </ol> <p>Result: The table view will scroll up because the decreased <code>contentSize</code> is making the valid <code>contentOffset</code> smaller too, during which process my <code>scrollViewDidScroll</code> method is not invoked, that makes the animation incomplete, and leaving <code>imageView</code> at wrong position in my case.</p> <p>I tried calling <code>scrollViewDidScroll:</code> right after removing rows. However <code>scrollViewDidScroll:</code> is invoked only once and the contentOffset is '0' in that execute. It's not gradually down to '0' . So is there any way for making <code>scrollViewDidScroll</code> being called continuously like it usually do? </p>
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