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    <p>First of all you do not need to recreate all constraints in -updateViewConstraints method. You need to just update them in this place. To achieve your aim do the following:</p> <ol> <li>Create your constraints only once. For example in method -setupConstraints. And keep reference to those that need to be updated. See code below.</li> <li>In method -updateViewConstraints just update topView height and width constraints and height for scrollViewContainer.</li> </ol> <p>Here's the ViewController.m should look like:</p> <pre><code>#import "ViewController.h" @interface ViewController () @property (nonatomic, strong) IBOutlet UIScrollView* pageScrollView; @property (nonatomic, strong) NSLayoutConstraint* pictureHeightConstraint; @property (nonatomic, strong) NSLayoutConstraint* topViewWidthConstraint; @property (nonatomic, strong) NSLayoutConstraint* topViewHeightConstraint; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; newBounds = [self sizeInOrientation:[UIApplication sharedApplication].statusBarOrientation]; newOrientation = [UIApplication sharedApplication].statusBarOrientation; bodyViewHeight = 1200; // The height of the body view varies in size depending on orientation self.pageScrollView.translatesAutoresizingMaskIntoConstraints = NO; topView = [[UIView alloc] init]; [topView setBackgroundColor:[UIColor clearColor]]; topView.translatesAutoresizingMaskIntoConstraints = NO; [self.pageScrollView addSubview:topView]; headerView = [[UIView alloc] init]; [headerView setBackgroundColor:[UIColor redColor]]; headerView.translatesAutoresizingMaskIntoConstraints = NO; [topView addSubview:headerView]; scrollViewContainer = [[UIView alloc] init]; [scrollViewContainer setBackgroundColor:[UIColor blueColor]]; scrollViewContainer.translatesAutoresizingMaskIntoConstraints = NO; [topView addSubview:scrollViewContainer]; bodyView = [[UIView alloc] init]; [bodyView setBackgroundColor:[UIColor greenColor]]; bodyView.translatesAutoresizingMaskIntoConstraints = NO; [topView addSubview:bodyView]; [self setupConstraints]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)setupConstraints { // Remove old constraints [self.view removeConstraints:self.view.constraints]; [self.pageScrollView removeConstraints:self.pageScrollView.constraints]; [topView removeConstraints:topView.constraints]; [scrollViewContainer removeConstraints:scrollViewContainer.constraints]; if ((newOrientation == UIDeviceOrientationLandscapeLeft) || (newOrientation == UIDeviceOrientationLandscapeRight)) { pictureScrollHeight = 300; } else { pictureScrollHeight = 203; } [headerView setNeedsDisplay]; [bodyView setNeedsDisplay]; CGFloat topViewHeight = bodyViewHeight + 55 + pictureScrollHeight; //self.pageScrollView = _pageScrollView NSDictionary *viewsDict = NSDictionaryOfVariableBindings(_pageScrollView, topView, headerView, bodyView, scrollViewContainer); // pageScrollView - child to self.view [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_pageScrollView]-0-|" options:0 metrics:nil views:viewsDict]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0- [_pageScrollView]-0-|" options:0 metrics:nil views:viewsDict]]; // topView - child to pageScrollView [self.pageScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[topView]-0-|" options:0 metrics:nil views:viewsDict]]; [self.pageScrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[topView]-0-|" options:0 metrics:nil views:viewsDict]]; NSLayoutConstraint* topViewWidthConstraint = [NSLayoutConstraint constraintWithItem:topView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:newBounds.width]; self.topViewWidthConstraint = topViewWidthConstraint; [topView addConstraint:self.topViewWidthConstraint]; NSLayoutConstraint* topViewHeightConstraint = [NSLayoutConstraint constraintWithItem:topView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:topViewHeight]; self.topViewHeightConstraint = topViewHeightConstraint; [topView addConstraint:self.topViewHeightConstraint]; // headerView - child to topView [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[headerView]-0-|" options:0 metrics:nil views:viewsDict]]; [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[headerView(55.0)]" options:0 metrics:nil views:viewsDict]]; // scrollViewContainer - child to topView [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[scrollViewContainer]-0-|" options:0 metrics:nil views:viewsDict]]; [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[headerView]-0-[scrollViewContainer]" options:0 metrics:nil views:viewsDict]]; NSLayoutConstraint* pictureHeightConstraint = [NSLayoutConstraint constraintWithItem:scrollViewContainer attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:pictureScrollHeight]; self.pictureHeightConstraint = pictureHeightConstraint; [scrollViewContainer addConstraint:self.pictureHeightConstraint]; // bodyView - child to topView [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[bodyView]-0-|" options:0 metrics:nil views:viewsDict]]; [topView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V: [scrollViewContainer]-0-[bodyView]-0-|" options:0 metrics:nil views:viewsDict]]; } - (void)updateViewConstraints { [super updateViewConstraints]; if ((newOrientation == UIDeviceOrientationLandscapeLeft) || (newOrientation == UIDeviceOrientationLandscapeRight)) { pictureScrollHeight = 300; } else { pictureScrollHeight = 203; } CGFloat topViewHeight = bodyViewHeight + 55 + pictureScrollHeight; self.pictureHeightConstraint.constant = pictureScrollHeight; self.topViewHeightConstraint.constant = topViewHeight; self.topViewWidthConstraint.constant = newBounds.width; [self.pageScrollView setNeedsUpdateConstraints]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { newBounds = [self sizeInOrientation:toInterfaceOrientation]; } -(CGSize)sizeInOrientation:(UIInterfaceOrientation)orientation { CGSize size = [UIScreen mainScreen].bounds.size; UIApplication *application = [UIApplication sharedApplication]; if (UIInterfaceOrientationIsLandscape(orientation)) { size = CGSizeMake(size.height, size.width); } if (application.statusBarHidden == NO) { size.height -= MIN(application.statusBarFrame.size.width, application.statusBarFrame.size.height); } return size; } @end </code></pre> <p>ScrollView calculates its content size automatically depending on subviews constraints added into it. Off course it works only in autolayout enviroument.</p>
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    1. USMark Kryzhanouski
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    1. COMark, Thanks for taking the time to help me out - your example works perfectly! Without checking your code, and just relying on your post here, do you mean that the problem was that I re-created the constraints every time? Many thanks!
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    2. COProbably yes. Scroll view is a little bit tricky. I don't have an exact answer. I've just removed unnecessary stuff.
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