与AVPlayer的平移手势
这个function对我的应用程序非常重要，并且真的很想帮助一下。 基本上，我想添加一个UIPanGestureRecognizer到video播放器，以便用户可以用手势快进/倒带video。
苹果有一些使用Swift 3的示例代码，并且已经创build了整个video播放器。 唯一缺less的是UIPanGestureRecognizer 。 这是链接： https ： //developer.apple.com/library/content/samplecode/AVFoundationSimplePlayer-iOS/Introduction/Intro.html#//apple_ref/doc/uid/TP40016103
在viewWillAppear我添加了这样的手势：
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture)) view.addGestureRecognizer(panGesture)
这是有点工作的代码。 目前正在擦洗。
问题是，每次我开始平移手势，video跳到中间，我从那里开始。 而不是从当前video的快进/快退，平移手势将video跳到中间，然后允许我快进/快退，这是不好的。
func handlePanGesture(sender: UIPanGestureRecognizer) { switch sender.state { case .began, .changed: let translation = sender.translation(in: self.view) var horizontalTranslation = Float(translation.x) let durationInSeconds = Float(CMTimeGetSeconds(player.currentItem!.asset.duration)) // Using 275 as the limit for delta along x let translationLimit: Float = 275 let minTranslation: Float = -1 * translationLimit let maxTranslation: Float = translationLimit if horizontalTranslation > maxTranslation { horizontalTranslation = maxTranslation } if horizontalTranslation < minTranslation { horizontalTranslation = minTranslation } let timeToSeekTo = normalize(delta: horizontalTranslation , minDelta: minTranslation, maxDelta: maxTranslation, minDuration: 0, maxDuration: durationInSeconds) print("horizontal translation \(horizontalTranslation) \n timeToSeekTo: \(timeToSeekTo)") let cmTime = CMTimeMakeWithSeconds(Float64(timeToSeekTo), self.player.currentTime().timescale) player.seek(to: cmTime) default: print("default") } } func normalize(delta: Float, minDelta: Float, maxDelta: Float, minDuration: Float, maxDuration: Float) -> Float { let result = ((delta - minDelta) * (maxDuration - minDuration) / (maxDelta - minDelta) + minDuration) return result }
任何帮助将是伟大的 – 谢谢！
我用AVPlayer实现了UIPanGesture ，下面是我的工作代码[swift 3] 。
func handleDraging(_ gesture:UIPanGestureRecognizer){ let location = gesture.location(in: self.playerView) if gesture.state == .began { print("\n\n-->---> Panning.state = .began at Point.x = \(location.x)") self.playerLayer.player?.rate = 0 self.stopTimer() }else if gesture.state == .changed { let valocity = gesture.velocity(in: self.playerView) print("\n\n-->---> Panning.state = .changed at Point.x = \(location.x)") let percentage = Double(location.x) / Double(self.playerView.frame.width) let currentTime = self.playerLayer.player!.currentTime() let currentSeconds = CMTimeGetSeconds(currentTime) var newSeconds = currentSeconds + percentage if valocity.x < 0 { newSeconds = currentSeconds - percentage } let newTime = CMTime(seconds: newSeconds, preferredTimescale: self.playerLayer.player!.currentTime().timescale) self.playerLayer.player?.seek(to: newTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero) let total = CGFloat(CMTimeGetSeconds(self.playerLayer.player!.currentItem!.asset.duration)) let seconds = CGFloat(CMTimeGetSeconds(newTime)) self.interval = Double(seconds)//here update your CurrentTimelabel.text ..... let temp = seconds/total self.progress = Float(temp)//here update your UIProgressBar.progress ..... print("\n\t-->Total Progress = \(temp)") }else if gesture.state == .ended || gesture.state == .failed || gesture.state == .recognized { gesture.setTranslation(CGPoint.zero, in: self.playerView) self.startTimer() self.playerLayer.player?.playImmediately(atRate: 1) } }