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POUIScrollView + change orientation = messed up subviews (iPad)
 

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  1. POUIScrollView + change orientation = messed up subviews (iPad)
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    <p>I want to use a <code>UIScrollView</code> as my main container in the app, enabling me to swipe back and forth between subviews. To achieve this, I created a <code>UIViewController</code> subclass with a <code>UIScrollView</code> <strong>IBOutlet</strong>:</p> <p>In the <code>viewDidLoad</code> method I construct the sub-pages:</p> <pre><code>for (int i= 0; i&lt; pageCount; i++) { CGRect frame = self.scrollView.frame; frame.origin.x = frame.size.width * i; frame.origin.y = 0; UIWebView* aWebView= [[UIWebView alloc] initWithFrame:frame]; [self.scrollView addSubview:aWebView]; } </code></pre> <p>When launching the app (portrait mode), everything works. That is, the <code>UIWebViews</code> are layed out side by side with the correct dimensions, and I can swipe back and forth between them.</p> <p>When I rotate to landscape, it seems that neither the scrollview size nor the subviews are resized.</p> <p>I don't know what I should do in order to resize the subviews and the scrollview itself, or at what point in code I should do anything, and I cant seem to find any examples for this.</p> <p>Anyone know what to do?</p> <p>[edit] Attempt to adjust sizes as suggested by mahboudz:</p> <pre><code>- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * pageCount, self.scrollView.frame.size.height); for (int i= 0; i&lt; pageCount; i++) { CGRect frame = self.scrollView.frame; frame.origin.x = frame.size.width * i; frame.origin.y = 0; UIWebView* view= [[self.scrollView subviews] objectAtIndex:i]; view.frame= frame; } } </code></pre> <p>This kind of does what I want, but has the following issues:</p> <p>1) one can see the subviews grow to correct screen size upon changing orientation</p> <p>2) when the current page is, for example, page 2 of 5 pages, the page is not fully visible after orientation was changed, but is off-screen by like 40 pixels</p> <p>3) I get strange effects depending on whether the app is launched in portrait or landscape mode (simulator), ill try to explain:</p> <p>When the app is launched in portrait mode:</p> <ul> <li>The shape/border of the subviews looks messed up/offscreen, see screenshots:</li> </ul> <p><a href="http://i53.tinypic.com/21jr76x.png" rel="nofollow">http://i53.tinypic.com/21jr76x.png</a></p> <ul> <li>when I rotate to landscape, everything looks okay, scrolling works superb. even when I rotate back to portrait, everything is great now:</li> </ul> <p><a href="http://i55.tinypic.com/if3iiw.png" rel="nofollow">http://i55.tinypic.com/if3iiw.png</a></p> <p>When the app is launchend in landscape mode:</p> <ul> <li><p>I get the same messed up/offscreen glitches as in portrait mode</p></li> <li><p>Switching back and forth between portrait and landscape fixes this for landscape mode</p></li> <li><p>BUT: Portrait mode will have the subviews with the width of the landscape mode, thus subviews are too wide</p></li> </ul> <p>I tried to fix 1) doing the code above in <code>willRotateToInterfaceOrientation</code> however it completely messed up the layout.</p> <p>I fixed 2) by adding the following code to <code>didRotateFromInterfaceOrientation</code>:</p> <pre><code>// update the scroll view to the appropriate page CGRect frame = self.scrollView.frame; frame.origin.x = frame.size.width * self.currentPage; frame.origin.y = 0; [self.scrollView scrollRectToVisible:frame animated:NO]; </code></pre> <p>Note: current page is determined in <code>scrollViewDidScroll</code></p> <p>I dont have any idea how to fix 3)</p>
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