The playback point, in seconds, within the timeline of the sound associated with the audio player.
- iOS 2.2+
- macOS 10.7+
- tvOS 9.0+
- watchOS 3.2+
If the sound is playing,
current is the offset of the current playback position, measured in seconds from the start of the sound. If the sound is not playing,
current is the offset of where playing starts upon calling the
play() method, measured in seconds from the start of the sound.
By setting this property you can seek to a specific point in a sound file or implement audio fast-forward and rewind functions.