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ios – AVAudioPlayer quantity jumps when fading with setVolume(_:fadeDuration:)

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I’ve an AVAudioPlayer occasion referred to as participant. After I set the quantity as follows, it really works as anticipated: the quantity begins at 1 and regularly fades to 0.

participant.quantity = 1
participant.setVolume(0, fadeDuration: 3)

However there’s a downside when I attempt to go the opposite means, as follows, beginning at quantity 0 and fading in to 1.

participant.quantity = 0
participant.setVolume(1, fadeDuration: 3)

After I run this, the quantity instantly jumps to quantity 1 with none fade. This looks like a bug to me, as a result of the conduct works with one set of values however not the opposite set of values.

I did discover a workaround right here, which wraps the quantity fade in a DispatchQueue name.

participant.quantity = 0
DispatchQueue.principal.async {
    self.audioPlayer?.setVolume(1, fadeDuration: 3)
}

This works. However I do not perceive why you want a DispatchQueue name to make it work a technique, however not the opposite means. Can anybody shed some gentle on this? I am questioning if that is an precise bug, or possibly I am simply doing one thing incorrect or not understanding one thing accurately.

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