Works like a charm. Thanks. This will allow me to have my animation
not consume 20% of the CPU on my laptop. My (hopefully) future
customers will appreciate that.
BTW, if anyone here would like to beta test my iPhone ringtone
creation app within which is my mostly gratuitous QC animation please
feel free to send me an email and I will send you a license and DL URL.
On May 17, 2009, at 5:54 PM, Christopher Wright wrote:
This is black magic, but it might help you out.
First, define our top-secret undocumented-api method:
@interface NSObject (WarningSuppression)
-(void)setMaximumFrameRate:(float)maxRate;
@end
(you can make the class QCCompositionLayer if you feel so inclined,
so minimize class-method-space pollution)
Next up, work your magic:
QCCompositionLayer *compLayer = [QCCompositionLayer
compositionLayerWithFile:@"/Users/cwright/Desktop/qtz/lame.qtz"];
[compLayer setMaximumFrameRate: 1.0]; < -- magic!
compLayer.frame = CGRectMake(0, 0, 128, 128);
[rootLayer addSublayer: compLayer];
This appears to make the composition layer render at 1 frame per
second for the 1 composition I tested it with.
This method is also available on the QCCompositionCellLayer class
(which makes use of the stuff above, as it's a subclass of
QCCompositionLayer), but it's also undocumented.
Standard Disclaimer: you typically don't want to muck about using
private APIs unless you want to babysit your code base every time a
software update happens.
Otherwise, have a lot of fun!
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