在 Swift Playground 中使用 AVPlayer 播放视频？

Posted 2023-03-14

【中文标题】在 Swift Playground 中使用 AVPlayer 播放视频？

【英文标题】：Play a video with AVPlayer in Swift Playground?

【发布时间】：2014-09-20 05:46:30

【问题描述】：

我在使用 AVPlayer 的 Swift Playground 中播放视频时遇到问题。

这是我的代码。

import UIKit
import AVFoundation

var f=CGRectMake(0, 0, 500, 500)
var url=NSURL(string: "http://s3.amazonaws.com/vids4project/sample.mp4")
var playerItem = AVPlayerItem(URL: url)

var v = UIView(frame:f)
var player=AVPlayer(playerItem: playerItem)
var playerLayer=AVPlayerLayer(player: player)

playerLayer.frame=f
v.layer.addSublayer(playerLayer)
player.play()

有什么建议吗？代码 as 什么都不做。我的期望是“v”变量应该显示视频。当我将 avplayerlayer 连接到情节提要的视图时，它似乎在操场外工作。

【参考方案1】：

如果你把它放到操场上，以下应该可以工作。确保换出路径：(Xcode 11 & Swift Playgrounds Mac & ios)

import UIKit
import AVFoundation
import PlaygroundSupport

var playerFrame = CGRect(x: 0, y: 0, width: 500, height: 500)

guard let path = Bundle.main.path(forResource: "movie", ofType: "m4v") else 
    fatalError("no movie found")


let url = URL(fileURLWithPath: path)

var playerItem = AVPlayerItem(url: url)

var playerView = UIView(frame: playerFrame)
playerView.backgroundColor = .black
var player = AVPlayer(playerItem: playerItem)
var playerLayer = AVPlayerLayer(player: player)

playerLayer.frame = playerFrame
playerView.layer.addSublayer(playerLayer)
player.play()

PlaygroundPage.current.liveView = playerView

PlaygroundPage.current.needsIndefiniteExecution = true

【讨论】：

谢谢！如何让它继续播放？

【参考方案2】：

尝试在最后添加这个以保持操场运行

import XCPlayground
XCPSetExecutionShouldContinueIndefinitely(continueIndefinitely: true)

【参考方案3】：

感谢@Justin Levi Winter 的回答，我已经更新了 Swift3 的代码，并使用 Xcode 8 进行了测试（此视频在时间线中播放，但不在快速查看中）：

import AVFoundation
import PlaygroundSupport


URLCache.shared = URLCache(memoryCapacity: 0, diskCapacity: 0, diskPath: nil)
let width = 568
let height = 320

let container = UIView(frame: CGRect(x: 0, y: 0, width: width, height: height))

PlaygroundPage.current.liveView = container

PlaygroundPage.current.needsIndefiniteExecution = true


func playVideo(_ url: URL)
    let f=CGRect(x: 0, y: 0, width: width, height: height)
    let playerItem = AVPlayerItem(url: url)

    let player=AVPlayer(playerItem: playerItem)
    let playerLayer=AVPlayerLayer(player: player)

    playerLayer.frame=f
    container.layer.addSublayer(playerLayer)
    PlaygroundPage.current.liveView = container

    player.play()


playVideo(URL(string:"http://s3.amazonaws.com/vids4project/sample.mp4")!)

【参考方案4】：

对于 Swift 5.*

在阅读了包括上述答案在内的几个答案后，我编写了以下代码。 它可以工作，但问题播放器视图位置有点偏离。我的意思是当它的框架的 x 和 y 值应该在左上角但它不坐在那里。顺便说一句，主要问题是如何编写url。

import UIKit
import PlaygroundSupport
import AVFoundation
import CoreMedia


class MyViewController : UIViewController 

    var mPlayer : AVPlayer?
    var mItem   : AVPlayerItem?
    var playerLayer        : AVPlayerLayer?
    var playerView = UIView()  
  


    override func loadView() 
    
        let view = UIView()
        self.view = view
        view.frame = CGRect(x: 0, y: 0, width: 1000, height: 1000)
        view.backgroundColor = .darkGray
    
        let playerFrame = CGRect(x: 1, y: 10, width: 500, height: 500)
        playerView.frame =  playerFrame
        view.addSubview(playerView)
        playVideo()
   
    

   func playVideo()
        let url0 =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0].appendingPathComponent("IMG_0626.MOV")
    
    
        mItem                       = AVPlayerItem(url: url0)
        mPlayer                     = AVPlayer(playerItem: mItem!)
        playerLayer                 = AVPlayerLayer(player: mPlayer) 
    
        playerView.layer.addSublayer(playerLayer!)
        playerLayer?.frame          = playerView.bounds
        playerLayer?.videoGravity   = AVLayerVideoGravity.resizeAspect
        mPlayer?.play()
    




// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
PlaygroundPage.current.needsIndefiniteExecution = true