I'd like to fade-out the sound played by MPMusicPlayerController
over a particular time period? How can I do this?
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问题:
回答1:
There is no fade functionality so you have to implement it yourself. Loop until volume is 0, and add a delay for each step. If you want all this to happen 2 seconds into the future, put the code on a block:
MPMusicPlayerController *iPod = [MPMusicPlayerController iPodMusicPlayer];
int64_t delay = 2LL * NSEC_PER_SEC;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW,delay), dispatch_get_current_queue(), ^{
while (iPod.volume>.1){
iPod.volume -= .1;
[NSThread sleepForTimeInterval:0.1];
}
});