Meaning of explicit transactions

[Gabriel Zachmann]

I am trying to learn about the Core Animation framework.



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

        [CATransaction begin];

        [currentLayer_ removeFromSuperlayer];
        // make new currentLayer_ ...
        [mainLayer_ addSublayer: currentLayer_ ];       
        [CATransaction commit];


are started at the point where 'CATransaction commit' is executed?
(with duration of 2 seconds)


Best regards,
Gabriel.

One thing I am still a bit unclear about is the exact meaning of explicit transactions. [CATransaction setValue: [NSNumber numberWithFloat: 2.0f] forKey: kCATransactionAnimationDuration ]; Does that mean that *both* animations (the one for removeFromSuperlayer and the one for addSublayer) 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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