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copied!<p>Try this on for size! ;-)</p> <p><em><strong>ViewController.h</em></strong></p> <pre><code>#define BUFFER 10 #define WIDTH 90 #import <UIKit/UIKit.h> @interface ViewController : UIViewController @property (strong, nonatomic) NSMutableArray *ViewArray; - (IBAction)hideViews:(id)sender; - (void)centerVisibleViews; @end </code></pre> <p><em><strong>ViewController.m</em></strong></p> <pre><code>#import "ViewController.h" @implementation ViewController @synthesize ViewArray; - (void)viewDidLoad { [super viewDidLoad]; NSMutableArray *colorArray = [NSMutableArray array]; [colorArray addObject:[UIColor redColor]]; [colorArray addObject:[UIColor orangeColor]]; [colorArray addObject:[UIColor yellowColor]]; [colorArray addObject:[UIColor greenColor]]; [colorArray addObject:[UIColor blueColor]]; [colorArray addObject:[UIColor purpleColor]]; [colorArray addObject:[UIColor blackColor]]; [self setViewArray:[NSMutableArray array]]; for (int i = 0; i < 7; i = i + 1) { UIView *view = [[UIView alloc] initWithFrame:CGRectMake(BUFFER + ((WIDTH + BUFFER) * i), BUFFER, WIDTH, WIDTH)]; [view setBackgroundColor:[colorArray objectAtIndex:i]]; [[self ViewArray] addObject:view]; [[self view] addSubview:view]; } } - (IBAction)hideViews:(id)sender { for (int i = 0; i < [[self ViewArray] count]; i = i + 1) { if (i == 1 || i == 4) { [(UIView *)[[self ViewArray] objectAtIndex:i] setHidden:YES]; } } [self centerVisibleViews]; } - (void)centerVisibleViews { int visibleViews = 0; for (int i = 0; i < [[self ViewArray] count]; i = i + 1) { if (![(UIView *)[[self ViewArray] objectAtIndex:i] isHidden]) { visibleViews = visibleViews + 1; } } float totalWidth = (BUFFER * 2) + (WIDTH * [[self ViewArray] count]) + (BUFFER * ([[self ViewArray] count] - 1)); float visibleWidth = (BUFFER * 2) + (WIDTH * visibleViews) + (BUFFER * (visibleViews - 1)); // Make it sexy with an animation!!! [UIView animateWithDuration:1.0 animations:^{ float offset = (totalWidth - visibleWidth) / 2.0; for (int i = 0; i < [[self ViewArray] count]; i = i + 1) { UIView *thisView = [[self ViewArray] objectAtIndex:i]; if (![thisView isHidden]) { [thisView setFrame:CGRectMake(offset, BUFFER, WIDTH, WIDTH)]; offset = offset + WIDTH + BUFFER; } } } ]; } @end </code></pre> <p>Only thing to do is add a button to the main view and tie it to the <code>IBOutlet</code>. Nice and pretty on my iPad simulator.</p>

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