Re: Core Animation : are text attributes animatable ?
Re: Core Animation : are text attributes animatable ?
- Subject: Re: Core Animation : are text attributes animatable ?
- From: Matt Long <email@hidden>
- Date: Wed, 27 Aug 2008 21:31:33 -0600
I can't speak to the example you mention specifically, but I had tried
to scale font sizes this way as well and never got the smooth
transition either. Instead I used something like this:
CATransform3D transform = CATransform3DMakeScale(factor, factor,
factor);
[mainLayer setTransform:transform];
[mainLayer setOpacity:0.0];
The layer instead gets *scaled* by the factor you specify. It does
seem, however, that the properties of the CATextLayer ought to be
animatable. Have you tried animating just a single property such as
the text foreground color on its own? Will have to check this one out
for myself.
I wrote a blog post a while back that shows specifically how to scale
layers so they look like they are coming at you out of the screen (I
dubbed it the Dashboard Effect). Not sure your desired effect, but you
can see the blog post here: http://www.cimgf.com/2008/03/15/core-animation-tutorial-dashboard-effect/
Best regards,
-Matt
On Aug 27, 2008, at 5:46 PM, Rodolfo Niborski wrote:
Hi everyone,
My question is twofold :
In the Core Animation Menu sample (Core Animation Programming Guide)
the inclusion of this line of code :
selectedLayer.string = @"new text";
in the -changeSelectedIndex: method results in an animation being
triggered : the old text fades out while the new text fades in. The
same happens if the fontSize or the foregroundColor properties are
modified. In the case of the fontSize, how can one achieve a
continuous transition, with the letters themselves becoming bigger
and bigger ?
And things happen to be different in my own code : I'm using a
CALayoutManager and here is it's main method :
-(void)layoutSublayersOfLayer:(CALayer*) layer
{
...
[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat: 1.5] forKey:
kCATransactionAnimationDuration];
[CATransaction setValue:[NSNumber numberWithBool: NO] forKey:
kCATransactionDisableActions];
int i = 0;
for(CATextLayer *letter in layer.sublayers)
{
letter.bounds = CGRectMake(0.0, 0.0, side, side);
letter.position = CGPointMake(l - side / 2 - (i % a) * side, h -
side / 2 - (i / a) * side);
i++;
letter.fontSize = side;
letter.foregroundColor = [self randomColor];
}
[CATransaction commit];
...
}
While position gets animated, I don't get any animation on text
attributes, not even the aforementioned fade in - fade out
animation. Does someone know how to get all the properties animated ?
Thanks a lot,
Rodolfo
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