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POAnimate a layout constraint constant from one value to another using Xamarin.ios
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  1. POAnimate a layout constraint constant from one value to another using Xamarin.ios
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    copied!<p>I am using Xamarin studio and developing an iPad app with Xamarin.iOS.</p> <p>I am setting a constant value against a layout constraint outlet in my c# file.</p> <h2>What I have at the moment (no animations)</h2> <pre><code>_myRightSpaceConstraint.Constant = 50; </code></pre> <h2>What I want</h2> <p>Animate this constant so that it goes from:</p> <pre><code>_myRightSpaceConstraint.Constant = 300; </code></pre> <p>to</p> <pre><code>_myRightSpaceConstraint.Constant = 50; </code></pre> <p><strong>OR</strong>, similar to above but don't specifiy what the start constant is (300), instead I just take whatever it is set to in the xib file and animate to 50.</p> <p>Is this possible to do this in Xamarin and if so are there any code examples to help me?</p> <h2>What I have tried - which doesnt work</h2> <pre><code>UIView.BeginAnimations ("slideAnimation"); float _pt; _pt = _myRightSpaceConstraint.Constant; UIView.SetAnimationDuration (5); UIView.SetAnimationCurve (UIViewAnimationCurve.EaseInOut); UIView.SetAnimationDelegate (this); UIView.SetAnimationDidStopSelector ( new Selector ("slideAnimationFinished:")); _myRightSpaceConstraint.Constant = 50; UIView.CommitAnimations (); </code></pre> <p>This actually sets the constant successfully to 50 but with no animation.</p> <h2>Edit/Update:</h2> <p>I managed to achieve what I wanted with the following:</p> <pre><code>_myRightSpaceConstraint.Constant = 150; _myViewWithTheConstraint.SetNeedsUpdateConstraints (); UIView.BeginAnimations ("slideAnimation"); UIView.SetAnimationDuration (1); UIView.SetAnimationCurve (UIViewAnimationCurve.EaseInOut); UIView.SetAnimationDelegate (this); UIView.SetAnimationDidStopSelector ( new Selector ("slideAnimationFinished:")); _myViewWithTheConstraint.LayoutIfNeeded (); UIView.CommitAnimations (); </code></pre> <p>The following line was the key:</p> <pre><code>_myViewWithTheConstraint.LayoutIfNeeded (); </code></pre>
 

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