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Re: Meaning of explicit transactions
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Re: Meaning of explicit transactions


  • Subject: Re: Meaning of explicit transactions
  • From: Scott Anguish <email@hidden>
  • Date: Fri, 2 Oct 2009 01:48:58 -0400

it means both.

the animations will start at the commit

and the animations will have the same duration.

Is this unclear in the doc?

On Sep 28, 2009, at 7:07 AM, Gabriel Zachmann wrote:

I am trying to learn about the Core Animation framework.

One thing I am still a bit unclear about is the exact meaning of explicit transactions.

For instance, assume I've got the following code:

[CATransaction begin];
[CATransaction setValue: [NSNumber numberWithFloat: 2.0f] forKey: kCATransactionAnimationDuration ];
[currentLayer_ removeFromSuperlayer];
// make new currentLayer_ ...
[mainLayer_ addSublayer: currentLayer_ ];
[CATransaction commit];


Does that mean that *both* animations (the one for removeFromSuperlayer and the one for addSublayer)
are started at the point where 'CATransaction commit' is executed?
(with duration of 2 seconds)
Or does it mean that both animations just have a duration of 2 seconds, but each of them is started at the respective point in the code?

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