If you read the documentation for NSObject's
performSelector:withObject:afterDelay it tells you which method you need to use
to cancel it again, and it's not NSRunLoop's
cancelPerformSelector:target:argument.
On 22 May, 2014, at 1:34 pm, Gerriet M. Denkmann <gerr...@mdenkmann.de> wrote:
>
> I have this code:
>
> - (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer
> didFinishSpeechUtterance:(AVSpeechUtterance *)utterance
> {
> NSTimeInterval delay = 5;
> NSLog(@"%s will resume music in %g sec.",__FUNCTION__, delay );
> NSRunLoop *currentRunLoop = [ NSRunLoop currentRunLoop ]; //
> not nil
> [ currentRunLoop cancelPerformSelector: @selector(resumeMusic) target:
> self argument: nil ];
> [ self performSelector: @selector(resumeMusic) withObject: nil
> afterDelay: delay ];
> }
>
> - (void)resumeMusic
> {
> NSLog(@"%s Done!",__FUNCTION__ );
> }
>
> When I speak something 7 times I get:
>
> 12:13:56.508 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:13:57.724 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:13:58.908 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:14:00.115 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:14:01.324 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:14:01.527 -[ContentViewController resumeMusic] Done!
> 12:14:02.520 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:14:02.730 -[ContentViewController resumeMusic] Done!
> 12:14:03.700 -[ContentViewController
> speechSynthesizer:didFinishSpeechUtterance:] will resume music in 5 sec.
> 12:14:03.929 -[ContentViewController resumeMusic] Done!
> 12:14:05.126 -[ContentViewController resumeMusic] Done!
> 12:14:06.339 -[ContentViewController resumeMusic] Done!
> 12:14:07.523 -[ContentViewController resumeMusic] Done!
> 12:14:08.705 -[ContentViewController resumeMusic] Done!
>
> But I would expect just to get *one* call to "resumeMusic" - 5 sec after the
> last call to speechSynthesizer:didFinishSpeechUtterance:. Instead I get 7
> calls - each 5 sec after the didFinishSpeechUtterance.
> Seems that cancelPerformSelector has no effect at all.
>
> What am I doing wrong?
> iOS 7.1.1
>
> Gerriet.
>
>
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