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    <p>I worked on this challenge tonight. I ran the code in the iPhone Simulator; it seems to work. However, I did not attempt to match the exact specifications of the OP, nor did I follow the link to tips on how to do this. I just wanted to see what I could knock out on my own in a couple of hours.</p> <p>There's nothing to see in storyboard except an empty, yellow scroll view pinned to the sides of the root view. </p> <p>The gray floating views are inside a yellow scroll view. The width of the scroll view's content size is the width of the root view; the height of the content size shrinks and expands to accommodate the varying number of rows. </p> <p>The only place I didn't use Auto Layout was for the scroll view's content view (here, I used Apple's so-called "Mixed Approach"). </p> <p>The widths of the floating cells are randomly generated whenever viewWillLayoutSubviews is called. Hence, all floating cells change their width upon device rotation. I held the height of all floating cells to a constant. </p> <p><img src="https://i.stack.imgur.com/gJ5jE.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/hhwdd.png" alt="enter image description here"></p> <pre><code>@interface ViewController () @property (nonatomic, strong) NSMutableArray *floatingViews; @property (weak, nonatomic) IBOutlet UIScrollView *scrollView; @property (nonatomic, strong) UIView *contentView; @end @implementation ViewController #define NUM_OF_VIEWS 18 #define HEIGHT 30.0f #define HORIZONTAL_SPACER 20.0f #define VERTICAL_SPACER 10.0f - (void)viewDidLoad { [super viewDidLoad]; self.contentView = [[UIView alloc] initWithFrame:self.view.bounds]; [self.scrollView addSubview:self.contentView]; self.floatingViews = [[NSMutableArray alloc] init]; for (int i = 0; i &lt; NUM_OF_VIEWS; i++) { UIView *view = [[UIView alloc] init]; view.backgroundColor = [UIColor grayColor]; view.translatesAutoresizingMaskIntoConstraints = NO; [self.floatingViews addObject:view]; [self.contentView addSubview:view]; } } - (void)viewWillLayoutSubviews { [self configureSizeConstraintsForAllViews]; CGFloat superviewWidth = self.view.bounds.size.width; int row = 0; CGFloat leftMargin = 0.0f; for (int i = 0; i &lt; [self.floatingViews count]; i++) { UIView *currentView = self.floatingViews[i]; // is there room for the current view on this row? NSLayoutConstraint *widthConstaint = [self widthConstraintForView:currentView]; CGFloat currentViewWidth = widthConstaint.constant; if ((leftMargin + currentViewWidth) &gt; superviewWidth) { row++; leftMargin = 0.0f; } // position current view [self configureTopConstraintForView:currentView forRow:row]; [self configureLeftConstraintForView:currentView withConstant:leftMargin]; // update leftMargin leftMargin += currentViewWidth + HORIZONTAL_SPACER; } // update size of content view and scroll view's content size CGRect rect = self.contentView.frame; rect.size.width = superviewWidth; rect.size.height = row * (HEIGHT + VERTICAL_SPACER) + HEIGHT; self.contentView.frame = rect; [self.scrollView setContentSize:rect.size]; } - (void)configureSizeConstraintsForAllViews { static BOOL firstTime = YES; if (firstTime) { firstTime = NO; [self configureHeightConstraintsForAllViews]; } for (int i = 0; i &lt; [self.floatingViews count]; i++) { [self configureRandomWidthForView:self.floatingViews[i]]; } } - (void)configureRandomWidthForView:(UIView *)view { CGFloat maxWidth = self.view.bounds.size.width; CGFloat minWidth = 30.0f; CGFloat randomScale = (arc4random() % 101) / 100.0f; // 0.0 - 1.0 CGFloat randomWidth = minWidth + randomScale * (maxWidth - minWidth); assert(randomWidth &gt;= minWidth &amp;&amp; randomWidth &lt;= maxWidth); NSLayoutConstraint *widthConstraint = [self widthConstraintForView:view]; if (!widthConstraint) { widthConstraint = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:0.0f]; [view addConstraint:widthConstraint]; } widthConstraint.constant = randomWidth; } - (NSLayoutConstraint *)widthConstraintForView:(UIView *)view { NSLayoutConstraint *widthConstraint = nil; for (NSLayoutConstraint *constraint in view.constraints) { if (constraint.firstAttribute == NSLayoutAttributeWidth) { widthConstraint = constraint; break; } } return widthConstraint; } - (NSLayoutConstraint *)topConstraintForView:(UIView *)view { NSLayoutConstraint *topConstraint = nil; for (NSLayoutConstraint *constraint in view.superview.constraints) { if (constraint.firstItem == view || constraint.secondItem == view) { if (constraint.firstAttribute == NSLayoutAttributeTop) { topConstraint = constraint; break; } } } return topConstraint; } - (NSLayoutConstraint *)leftConstraintForView:(UIView *)view { NSLayoutConstraint *leftConstraint = nil; for (NSLayoutConstraint *constraint in view.superview.constraints) { if (constraint.firstItem == view || constraint.secondItem == view) { if (constraint.firstAttribute == NSLayoutAttributeLeft) { leftConstraint = constraint; break; } } } return leftConstraint; } - (void)configureHeightConstraintsForAllViews { assert(self.floatingViews); for (int i = 0; i &lt; [self.floatingViews count]; i++) { UIView *view = self.floatingViews[i]; [view addConstraint:[NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:HEIGHT]]; } } - (void)configureTopConstraintForView:(UIView *)view forRow:(NSUInteger)row { NSLayoutConstraint *topConstraint = [self topConstraintForView:view]; if (!topConstraint) { topConstraint = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view.superview attribute:NSLayoutAttributeTop multiplier:1.0f constant:0.0f]; [view.superview addConstraint:topConstraint]; } topConstraint.constant = row * (HEIGHT + VERTICAL_SPACER); } - (void)configureLeftConstraintForView:(UIView *)view withConstant:(CGFloat)constant { NSLayoutConstraint *leftConstraint = [self leftConstraintForView:view]; if (!leftConstraint) { leftConstraint = [NSLayoutConstraint constraintWithItem:view attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:view.superview attribute:NSLayoutAttributeLeft multiplier:1.0f constant:0.0f]; [view.superview addConstraint:leftConstraint]; } leftConstraint.constant = constant; } - (BOOL)prefersStatusBarHidden { return YES; } @end </code></pre>
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