I have a very simple composition that puts out an image in a
QCCompositionLayer. That works. I have added a simple 10 sec. timer with a
published flag (BOOL) which has been verified to work in Quartz Composer. I
have also verified the output key for the flag. The flag is (eventually)
supposed to tell me when the composition is finished.
Trying to use an observer to monitor it has failed.
observeValueForKeyPath is never called. Am I going to have to poll it? Or
is there some stupid mistake in the following?
(KTerminateCompositionFlag = @"terminated")
- (void)installLayer:(BOOL)install {
if(install) {
CALayer* attentionLayer = [self attentionLayer];
if(attentionLayer == nil)
return;
[[compLayer composition] addObserver:self
forKeyPath:kTerminateCompositionFlag
options:NSKeyValueObservingOptionNew
context:NULL];
[attentionLayer addSublayer:compLayer];
// Start playing. Supposed to be automatic.
}
else {
[compLayer removeFromSuperlayer];
[[compLayer composition] removeObserver:self
forKeyPath:kTerminateCompositionFlag];
}
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)observedObject
change:(NSDictionary *)change
context:(void *)context
{
// Let us know when composition terminates
if ([keyPath isEqualToString:kTerminateCompositionFlag]) {
BOOL result = [[[compLayer composition]
valueForKey:kTerminateCompositionFlag] boolValue];
if(result) // The only case it should be.
[self endComposition];
}
}
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