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POUIScrollView not scrolling until orientation changes
 

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    <p>I have a UIScrollView dynamically added into the main view, and I'm filling it with small UIView objects. I'm setting it's contentSize to something bigger than the device's resolution but I can't scroll it until I'm changing the device's orientation.</p> <p>How can I make it scroll before orientation change ?</p> <p>LATER EDIT :</p> <p>I realized that the problem comes from certain subviews that i'm adding, more specifically from adding some contraints for those subviews:</p> <p>Here is the code where I'm adding the subviews (the method is called about 10-20 times) :</p> <pre><code>-(void) addShelve:(NSInteger) index { FSShelf *shelf = [[FSShelf alloc] initWithFrame:CGRectMake(0, index * [FSConstants getShelfVerticalDistance], 0, 0)]; [shelves addObject:shelf]; [shelfView addSubview:shelf]; [shelf addShelfConstraints]; } </code></pre> <p>FSShelf is a subclass of UIView and shelfView is my subclass of UIScrollView.</p> <p>And here are the constraints added at <code>addShelfContraints</code> :</p> <pre><code> [self.superview addConstraint:[FSUtils getWidthConstraintFor:self.superview with:self constant: -2 * ([FSConstants getShelveMargin])]]; [self addConstraint:[FSUtils getSelfHeightConstraintFor:self constant:30]]; [self.superview addConstraint:[FSUtils getCenterXConstraintFor:self.superview with:self constant:0]]; </code></pre> <p>The methods from the FSUtils class for adding contraints:</p> <pre><code>+ (NSLayoutConstraint *)getSelfHeightConstraintFor:(UIView *)view constant:(CGFloat)constant { NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:constant]; return constraint; } + (NSLayoutConstraint *)getCenterXConstraintFor:(UIView *)superView with:(UIView *)subView constant:(CGFloat)constant { NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:subView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:constant]; return constraint; } + (NSLayoutConstraint *)getWidthConstraintFor:(UIView *)superView with:(UIView *)subView constant:(CGFloat)constant { NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:subView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:superView attribute:NSLayoutAttributeWidth multiplier:1.0 constant:constant]; return constraint; } </code></pre> <p>Do you notice anything wrong with those contraints?</p>
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    1. COCan you give us some extra details on your setup? When is the UIScrollView initialized? Is the scroll view's frame smaller than its contentSize (before rotation)? The easiest way I can imagine to hit your bug is for the scroll view's frame to be too large.
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    2. COThe scrollView has constraints to be 100% width and (100% - 50px height). I checked the content size and it's height is bigger than 2000px. I'm initializind the UIScrollView on a singleTap event, when I'm replacing the content of the main view (removing a uiview and adding the scrollview). I'll post some code later today when I get back to the project.
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    3. COplease post your code related to your UIScrollView.
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