Meaning of explicit transactions

Subject: Meaning of explicit transactions
From: Gabriel Zachmann <email@hidden>
Date: Mon, 28 Sep 2009 13:07:00 +0200
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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?

Best regards,
Gabriel.

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