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Editorial Team
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Asked: 2026-05-13T16:37:23+00:00

I have an iPhone app that displays a modal view controller. The modal view

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I have an iPhone app that displays a modal view controller. The modal view controller shows two instances of a custom subclass of UITextView called RoundedTextView, an MKMapView, and a UIToolbar. I construct the viewController only once, and reset its data and present it each time the user summons it.

When showing this view controller with presentModalViewController, I noticed that the animation to show the view was choppy on the 3G. So, to speed it up, I set the alpha of the MKMapView and the two RoundedTextView objects to 0 on viewWillDisappear and back to 1 on viewDidAppear. This made it nice and fast. I also presume that I could remove the views from the superview to speed it up as well.

Does anyone else jump through these kind of hoops on the iPhone. Is there something else I should be doing to avoid this hack?

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1 Answer

  1. Editorial Team

    It’s not a hack to simplify drawing during animation in order to make the animation more smooth. It is indeed a very valid technique.

    You may be able to achieve similar performance improvements by setting all UI elements to Opaque, a technique also used to fix table view cell performance issues. You just have to make sure background colors match.

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