Swift 中作为 UISlider 的音频播放进度
Audio playback progress as UISlider in Swift
我在 Objective-C 中看到了一些关于完成此操作的帖子,但我无法通过 Swift 完成同样的操作。
具体来说,我不知道如何在下面实现 addPeriodicTimeObserverForInterval
。
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()
}
如有任何帮助,我们将不胜感激。
感谢上面 Dare 的建议,我是这样完成的:
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)
}
只是为了详细说明我之前的评论,这就是我实现它的方式,它似乎工作得很好。任何 Swift 更正都非常受欢迎,我现在仍然是一个 Obj-C 人。
@IBAction func playAudio(sender: AnyObject) {
var playing = false
if let currentPlayer = player {
playing = player.playing;
}else{
return;
}
if !playing {
let filePath = NSBundle.mainBundle().pathForResource("3e6129f2-8d6d-4cf4-a5ec-1b51b6c8e18b", ofType: "wav")
if let path = filePath{
let fileURL = NSURL(string: path)
player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
player.numberOfLoops = -1 // play indefinitely
player.prepareToPlay()
player.delegate = self
player.play()
displayLink = CADisplayLink(target: self, selector: ("updateSliderProgress"))
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode!)
}
} else {
player.stop()
displayLink.invalidate()
}
}
func updateSliderProgress(){
var progress = player.currentTime / player.duration
timeSlider.setValue(Float(progress), animated: false)
}
*我在故事板上将时间滑块的范围设置在 0 和 1 之间
特别是 Swift 我是这样处理的:
我将 scrubSlider
的最大值设置为在此方法中加载的音乐文件 (.mp3) 的持续时间
override func viewDidLoad() {
super.viewDidLoad()
do {
try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("bach", ofType: "mp3")!))
scrubSlider.maximumValue = Float(player.duration)
} catch {
//Error
}
_ = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(ViewController.updateScrubSlider), userInfo: nil, repeats: true)
}
我的播放器被设置为在 scrubber 的值设置的时间播放音乐。
@IBAction func scrub(sender: AnyObject) {
player.currentTime = NSTimeInterval(scrubSlider.value)
}
Swift4 中的语法现已更改:
updater = CADisplayLink(target: self, selector: #selector(self.trackAudio))
updater.preferredFramesPerSecond = 1
updater.add(to: RunLoop.current, forMode: RunLoopMode.commonModes)
和函数(我之前将progressSlider.maxValue设置为player.duration):
@objc func trackAudio() {
progressSlider.value = Float(player!.currentTime)
}
我在 Objective-C 中看到了一些关于完成此操作的帖子,但我无法通过 Swift 完成同样的操作。
具体来说,我不知道如何在下面实现 addPeriodicTimeObserverForInterval
。
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()
}
如有任何帮助,我们将不胜感激。
感谢上面 Dare 的建议,我是这样完成的:
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)
}
只是为了详细说明我之前的评论,这就是我实现它的方式,它似乎工作得很好。任何 Swift 更正都非常受欢迎,我现在仍然是一个 Obj-C 人。
@IBAction func playAudio(sender: AnyObject) {
var playing = false
if let currentPlayer = player {
playing = player.playing;
}else{
return;
}
if !playing {
let filePath = NSBundle.mainBundle().pathForResource("3e6129f2-8d6d-4cf4-a5ec-1b51b6c8e18b", ofType: "wav")
if let path = filePath{
let fileURL = NSURL(string: path)
player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
player.numberOfLoops = -1 // play indefinitely
player.prepareToPlay()
player.delegate = self
player.play()
displayLink = CADisplayLink(target: self, selector: ("updateSliderProgress"))
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode!)
}
} else {
player.stop()
displayLink.invalidate()
}
}
func updateSliderProgress(){
var progress = player.currentTime / player.duration
timeSlider.setValue(Float(progress), animated: false)
}
*我在故事板上将时间滑块的范围设置在 0 和 1 之间
特别是 Swift 我是这样处理的:
我将
scrubSlider
的最大值设置为在此方法中加载的音乐文件 (.mp3) 的持续时间override func viewDidLoad() { super.viewDidLoad() do { try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("bach", ofType: "mp3")!)) scrubSlider.maximumValue = Float(player.duration) } catch { //Error } _ = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(ViewController.updateScrubSlider), userInfo: nil, repeats: true) }
我的播放器被设置为在 scrubber 的值设置的时间播放音乐。
@IBAction func scrub(sender: AnyObject) { player.currentTime = NSTimeInterval(scrubSlider.value) }
Swift4 中的语法现已更改:
updater = CADisplayLink(target: self, selector: #selector(self.trackAudio))
updater.preferredFramesPerSecond = 1
updater.add(to: RunLoop.current, forMode: RunLoopMode.commonModes)
和函数(我之前将progressSlider.maxValue设置为player.duration):
@objc func trackAudio() {
progressSlider.value = Float(player!.currentTime)
}