iOS中AVPlayer的在线播放和播放进度条,音量条

在iOS中使用AVPlayer进行在线播放和控制播放进度条和音量条有以下几个步骤：
1. 导入AVFoundation框架
```swift
import AVFoundation
```
2. 创建AVPlayer实例并加载在线视频URL
```swift
let videoURL = URL(string: "https://example.com/video.mp4")
let player = AVPlayer(url: videoURL!)
```
3. 创建AVPlayerLayer实例并将其添加到视图中以显示视频播放画面
```swift
let playerLayer = AVPlayerLayer(player: player)
playerLayer.frame = view.bounds
view.layer.addSublayer(playerLayer)
```
4. 播放视频
```swift
player.play()
```
5. 创建UISlider实例作为进度条，并设置最小值、最大值和初始值
```swift
let progressSlider = UISlider()
progressSlider.minimumValue = 0
progressSlider.maximumValue = Float(CMTimeGetSeconds(player.currentItem?.duration ?? CMTime()))
progressSlider.value = 0
```
6. 监听播放进度变化并更新进度条的值
```swift
player.addPeriodicTimeObserver(forInterval: CMTime(seconds: 1, preferredTimescale: 1), queue: .main) { [weak self] time in
let currentTime = CMTimeGetSeconds(time)
self?.progressSlider.value = Float(currentTime)
}
```
7. 控制视频播放进度
```swift
let seekTime = CMTime(seconds: Double(progressSlider.value), preferredTimescale: 1)
player.seek(to: seekTime)
```
8. 创建UISlider实例作为音量条，并设置最小值、最大值和初始值
```swift
let volumeSlider = UISlider()
volumeSlider.minimumValue = 0
volumeSlider.maximumValue = 1
volumeSlider.value = player.volume
```
9. 控制音量
```swift
player.volume = volumeSlider.value
```
以上是使用AVPlayer进行在线播放和控制播放进度条和音量条的基本步骤，可以根据自己的需求进行定制和扩展。