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POProgrammatic Vertical Alignment of UIPageControl in Superview using NSLayoutConstraint
 

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    <p>Up until now, I was able to avoid using Auto Layout, so apologies for the (potentially) stupid question.</p> <ul> <li>I have a ViewController that is being built programmatically (e.g., no IB).</li> <li>I have a UIPageControl object that is in the view hierarchy of the viewController's view (e.g., <code>addSubview:</code>)</li> <li>I need, rather, want to align a UIPageControl object against the bottom edge of the UIViewController's main view. </li> <li>I want the UIPageControl to be centered horizontally, but 20-40 pixels from the bottom's edge.</li> </ul> <p>Here's some sample code I have that is creating the UIPageControl and displaying it, but not in the correct location at all.</p> <pre><code>self.pageControl = [[UIPageControl alloc] init]; self.pageControl.numberOfPages = ...; self.pageControl.otherAttributes = ...; [self.view addSubview:[self pageControl]]; UIPageControl *pageControl = [self pageControl]; UIView *view = [self view]; NSDictionary *constaintDictionary = NSDictionaryOfVariableBindings(view, pageControl); [self.view addConstraint:[NSLayoutConstraint constraintWithItem:pageControl attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]]; [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[pageControl]-20-[view]" options:0 metrics:nil views:constaintDictionary]]; </code></pre> <p>Like I said, I'm really new to auto-layout, so I'm not sure if I'm even implementing these methods properly.</p> <p>Thank you for your assistance ahead of time.</p>
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