本文介绍了音频播放在Swift中作为UISlider进行的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经看过一些关于在Objective-C中完成此事的帖子,但我一直无法通过Swift做同样的事情。
I've seen some posts about accomplishing this in Objective-C but I've been unable to do the same via Swift.
具体来说,我无法弄清楚如何在下面实现 addPeriodicTimeObserverForInterval
。
Specifically, I can't figure out how to implement addPeriodicTimeObserverForInterval
in the below.
var player : AVAudioPlayer! = nil
@IBAction func playAudio(sender: AnyObject) {
playButton.selected = !(playButton.selected)
if playButton.selected {
let fileURL = NSURL(string: toPass)
player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
player.numberOfLoops = -1 // play indefinitely
player.prepareToPlay()
player.delegate = self
player.play()
startTime.text = "\(player.currentTime)"
endTime.text = NSString(format: "%.1f", player.duration)
} else {
player.stop()
}
任何帮助都将不胜感激。
Any assistance would be appreciated.
推荐答案
感谢上面Dare的建议,以下是我如何做到这一点:
Thanks to the suggestion of Dare above, here's how I accomplished this:
var updater : CADisplayLink! = nil
@IBAction func playAudio(sender: AnyObject) {
playButton.selected = !(playButton.selected)
if playButton.selected {
updater = CADisplayLink(target: self, selector: Selector("trackAudio"))
updater.frameInterval = 1
updater.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSRunLoopCommonModes)
let fileURL = NSURL(string: toPass)
player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
player.numberOfLoops = -1 // play indefinitely
player.prepareToPlay()
player.delegate = self
player.play()
startTime.text = "\(player.currentTime)"
theProgressBar.minimumValue = 0
theProgressBar.maximumValue = 100 // Percentage
} else {
player.stop()
}
}
func trackAudio() {
var normalizedTime = Float(player.currentTime * 100.0 / player.duration)
theProgressBar.value = normalizedTime
}
@IBAction func cancelClicked(sender: AnyObject) {
player.stop()
updater.invalidate()
dismissViewControllerAnimated(true, completion: nil)
}
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