使用AVPlayer进行Pan Gesture [英] Pan Gesture with AVPlayer
问题描述
此功能对我的应用非常重要,并且非常需要一些帮助。基本上,我想向视频播放器添加 UIPanGestureRecognizer
,以便用户可以使用手势快进/快退视频。
This feature is really important to my app and would really like some help on it. Basically, I want to add a UIPanGestureRecognizer
to a video player so that the user can fast forward/rewind the video with the gesture.
Apple有一些使用Swift 3的示例代码,并且已经创建了整个视频播放器。唯一缺少的是 UIPanGestureRecognizer
。这是链接: https://developer.apple.com/library/content/samplecode/AVFoundationSimplePlayer-iOS/Introduction/Intro.html#//apple_ref/doc/uid/TP40016103
Apple has some sample code which uses Swift 3 and has the entire video player already created. The only thing missing is the UIPanGestureRecognizer
. This is the link: 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:
In viewWillAppear
I added the gesture like so:
let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture))
view.addGestureRecognizer(panGesture)
这是有点工作的代码。它目前正在擦洗。
This is the code that is working somewhat. It is currently scrubbing.
问题是每次我开始平移手势时,视频会跳到中间,然后从那里开始。平移手势不是从视频当前位置快进/快退,而是将视频跳到中间,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
}
任何帮助都会很棒 - 谢谢!
Any help would be great - thanks!
推荐答案
我用 AVPlayer
实现了 UIPanGesture
,下面是我的工作代码 [swift 3]
。
i've implemented UIPanGesture
with AVPlayer
, below is my working code [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)
}
}
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