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POAuto layout invalid after presenting view controller (and many situation)
 

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  1. POAuto layout invalid after presenting view controller (and many situation)
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    <h3>Background:</h3> <p>I have a custom container controller, which just like UITabBarController, but with switch animation. And I use auto layout to achieve.<br> Because switch between child controllers is dynamic, the proper constraints are added to child view controller when its's view is added into container's view, not pre-setup in IB. (The constraints are added to the superview of course)</p> <p><a href="http://d.pr/i/q6NF" rel="nofollow noreferrer">http://d.pr/i/q6NF</a> Container Controller Nib Setup</p> <p>PS: The detail of constraints<br> H:|[Child](Change the constraint's constant to animation from left/right to right/left)<br> H:[Child(==Super)]<br> V:|[Child]| </p> <h3>Where is the Problem:</h3> <p>One of the child controller is a navigation controller, things go wrong when the navigation controller present a modal view controller (using <code>presentViewController:animated:completion:</code>), and dismiss it(using<code>dismissViewControllerAnimated:completion:</code>), after present/ dismiss the frame of navigation controller become (x, y, 0, 0), <strong>It seems like the auto layout becomes invalid, maybe the constraints been removed.</strong></p> <p><a href="http://d.pr/i/VmvL" rel="nofollow noreferrer">http://d.pr/i/VmvL</a> The Present/ Dismiss Process</p> <h3>Research</h3> <p>I haven't use code to verify what happen to these constraints yet, but with Spark Inspector I see the views presentation change during the present/ dismiss process. When My navigation controller present a modal view controller, iOS just <strong>swap</strong> the whole navigation controller's view to the modal view controller's view. And when navigation controller's view come back, the auto layout doesn't work anymore.</p> <h3>Possible Solution</h3> <p>One of the solution I came up with is let my container controller present modal controller.</p> <p>Or I just change my container controller to no auto layout.</p> <p>The fact is ever since I start using auto layout, the problems this technique causes just dominate the benefits. <strong>Besides this problem</strong>, Every time the interface orientation changes, views inside my container controller just can't auto layout right, it seems subviews always use the frame of superview before orientation change. I double check the constraints I setup, there is no conflicts and no ambiguity.</p> <p><strong>My guess</strong> is that my custom container controller isn't compatible with presenting modal view controller and interface orientation change in Auto Layout system, even with constraints setup.</p> <h3>Xcode Environment</h3> <p><strong>Xcode 5 beta, iOS 7SDK, target iOS6.1</strong> Maybe Something not right with the SDK environment?</p>
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    1. USMichael Hui
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    1. COIt seems I have similar problem... http://stackoverflow.com/q/18156774
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    2. COI'm having similar problems in an iPhone app, I don't think xcode 5 beta is the problem...
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      1. USRaspu
 

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