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POUIScrollView adjusts contentOffset when contentSize changes
 

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    <p>I am adjusting a detail view controller's state, just before it is pushed on a <code>navigationController</code>:</p> <pre><code>[self.detailViewController detailsForObject:someObject]; [self.navigationController pushViewController:self.detailViewController animated:YES]; </code></pre> <p>In the <code>DetailViewController</code> a scrollView resides. Which content I resize based on the passed object:</p> <pre><code>- (void)detailsForObject:(id)someObject { // set some textView's content here self.contentView.frame = &lt;rect with new calculated size&gt;; self.scrollView.contentSize = self.contentView.frame.size; self.scrollView.contentOffset = CGPointZero; } </code></pre> <p>Now, this all works, but the scrollView adjusts it's <code>contentOffset</code> during the navigationController's slide-in animation. The <code>contentOffset</code> will be set to the difference between the last contentSize and the new calculated one. This means that the second time you open the detailsView, the details will scroll to some unwanted location. Even though I'm setting the <code>contentOffset</code> to <code>CGPointZero</code> explicitly.</p> <p>I found that resetting the <code>contentOffset</code> in <code>- viewWillAppear</code> has no effect. The best I could come up with is resetting the contentOffset in <code>viewDidAppear</code>, causing a noticeable up and down movement of the content:</p> <pre><code>- (void)viewDidAppear:(BOOL)animated { self.scrollView.contentOffset = CGPointZero; } </code></pre> <p>Is there a way to prevent a <code>UIScrollView</code> from adjusting its <code>contentOffset</code> when its <code>contentSize</code> is changed?</p>
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    1. USJay Bhalani
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    1. COWhy are you adjusting the content offset within an animation block? Skip the CATransaction stuff, so it doesn't animate. Then it won't look choppy.
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    2. CORemoving the CATransaction stuff indeed does not change a thing, so it is removed.
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    3. COAre you sure viewDidAppear is getting called? I'd set a breakpoint or a NSLog statement in it. Also, have you tried switching the order of your calls, i.e. setting the detailsForObject after pushing?
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