How can I stop CALayers from animating?

Question

I've created a bunch of sublayers within my view, populating each one with a graphic, so effectively they are sprites. However, when I call [lineLayer setValue:[NSNumber numberWithFloat:0.5] forKeyPath:@"transform.scale"] it appears to 'tween' to that size instead of just appearing at the new scale.

Is there any way of switching off this behaviour? I just want to change the scale directly.

Thanks!

:-Joe

score 12 · Answer 1 · edited Jan 15 '13 at 23:29

12

Also, for cleanliness' sake, use this line:

[CATransaction setDisableActions:YES];

in place of this one:

[CATransaction setValue:(id)kCFBooleanTrue
               forKey:kCATransactionDisableActions];

edited Jan 15 '13 at 23:29

Bo Persson

90,663
31
146
203

answered Jan 15 '13 at 22:35

Christopher Schardt

391
3
13

Good point, I don't know why Apple didn't state it like that in their help! Although this isn't really a separate answer... It should really be added to the other answer. Thanks. – jowie Jan 16 '13 at 12:30
Can I just add that you only need that line too. – Lee Probert Mar 18 '13 at 18:15

score 12 · Accepted Answer · answered Aug 11 '10 at 16:17

Ahhh I just answered my own question... I keep doing that on here!

From the help:

You can temporarily disable layer actions when changing layer property values by setting the value of the transaction’s kCATransactionDisableActions to true. Any changes made during the scope of that transaction will not result in an animation occurring. Listing 2 shows an example that disables the fade animation that occurs when removing aLayer from a visible layer-tree.

[CATransaction begin];
[CATransaction setValue:(id)kCFBooleanTrue
                 forKey:kCATransactionDisableActions];
[aLayer removeFromSuperlayer];
[CATransaction commit];

As @Bo and @Christopher pointed out elsewhere on this page, the property-setter `[CATransaction setDisableActions:YES];` is a cleaner way to do this. — JaredH, Oct 19 '15 at 02:13

How can I stop CALayers from animating?

2 Answers2