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POHow to prevent view from "flashing" at the end of a custom UIStoryboardSegue?
 

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  1. POHow to prevent view from "flashing" at the end of a custom UIStoryboardSegue?
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    <p>I have written a custom <code>UIStoryboardSegue</code> which I'm using to transition between various <code>UIViewControllers</code>. The animations work as desired, and much of the time the <code>UIStoryboardSegue</code> displays as I'd expected both in the simulator and on the device.</p> <p>However, sometimes after the segue completes, I can see the old <code>UIViewController</code> <strong>flash</strong> for a fraction of a second after the <code>UIStoryboardSegue</code> completes. The result disrupts the smooth transition I am expecting. Unfortunately, I can't discern any pattern for this behaviour.</p> <p>I've included a barebones version of the approach I'm using to manage the segue below. Is there a more reliable method to insure smooth transitions? Am I doing something wrong? Again, much of the time the segue looks just the way I want.</p> <pre><code>- (void)perform { self.window = [[[UIApplication sharedApplication] delegate] window]; UIViewController *source = (UIViewController *) self.sourceViewController; UIViewController *dest = (UIViewController *) self.destinationViewController; [self.window insertSubview:dest.view.window belowSubview:source.view]; self.segueLayer = [CALayer layer]; // Create and add a number of other CALayers for displaying the segue, // adding them to the base segueLayer // Create and add CAAnimations for animating the CALayers // (code omitted for the sake of space) [self.window addSubview:dest.view]; [self.window.layer addSublayer:self.segueLayer]; [source.view removeFromSuperview]; } - (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)isFinished { UIViewController *source = (UIViewController *) self.sourceViewController; UIViewController *dest = (UIViewController *) self.destinationViewController; if (isFinished) { // Remove and deallocate the CALayers previously created [self.segueLayer removeFromSuperlayer]; self.segueLayer = nil; self.window.rootViewController = dest; } } </code></pre>
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    1. USAlex Cio
    1. USIan Bogost
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    1. COOne suggestion I am trying: setting both the `removedOnCompletion = NO` and `fillMode = kCAFillModeForwards` for all my CAAnimation instances. Perhaps they are being reset.
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      1. POHow to prevent view from "flashing" at the end of a custom UIStoryboardSegue?
      1. USIan Bogost
 

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