在swift spritkit场景上淡出video

我正在将一个陈列室应用程序从as3 / starling移植到一个原生的swift iPad应用程序。

我有两个问题：

1. 如何通过我的spritekit内容（从alpha 0到1）淡化video。

2. 如何使用单个UI元素控制iPad音量而不显示iOS屏幕上的音量通知图形。

Answer 1

我的第一个答案回答了您的初始问题，并且此答案适用于评论中发布的后续问题。 我觉得这两个答案对社区都很有用，而不是合并到我认为会让人困惑的一个。

在这里，我实现了一个音量滑块和一个控制VideoNode的AVPlayer对象的擦洗滑块。您可以获得AVPlayer的全部function，但具有SKVideoNode的便利性。 此外，无需调整系统音量和随后的灰色音箱弹出即可控制播放video的音量：

import SpriteKit import MediaPlayer class GameScene: SKScene { let seekSlider = UISlider(frame: CGRect(x: 0, y: 0, width: 200, height: 15)) let volSlider = UISlider(frame: CGRect(x: 0, y: 0, width: 200, height: 15)) // Because it takes time for us to load the video, we don't know it's duration, // hence we don't know what the `.maximumValue` should be for the seekSlider let defaultMax = Float(0.123456789) var player: AVPlayer! var videoNode: SKVideoNode! func seekSliderChangedValue(sender: UISlider) { // Wait for file to finish loading so we can get accurate end duration: if sender.maximumValue == defaultMax { if CMTimeGetSeconds(player.currentItem!.duration).isNaN { return } else { sender.maximumValue = Float(CMTimeGetSeconds(player.currentItem!.duration)) } } let value = CMTimeMake(Int64(seekSlider.value), 1) player.seek(to: value) player.play() } func volSliderChangedValue(sender: UISlider) { player.volume = sender.value } override func didMove(to view: SKView) { removeAllChildren() // Delete this in your actual project. // Add some labels: let seekLabel = SKLabelNode(text: "Seek") seekLabel.setScale(3) seekLabel.verticalAlignmentMode = .center seekLabel.position = CGPoint(x: frame.minX + seekLabel.frame.width/2, y: frame.maxY - seekLabel.frame.height) let volLabel = SKLabelNode(text: "Volume") volLabel.setScale(3) volLabel.verticalAlignmentMode = .center volLabel.position = CGPoint(x: frame.minX + volLabel.frame.width/2, y: frame.minY + volLabel.frame.height + volSlider.frame.height) // Make player and node: let url = Bundle.main.url(forResource: "sample", withExtension: "mp4")! player = AVPlayer(url: url) videoNode = SKVideoNode(avPlayer: player!) //Configure seek slider: seekSlider.addTarget(self, action: #selector(seekSliderChangedValue), for: UIControlEvents.valueChanged) seekSlider.maximumValue = defaultMax let seekOrigin = convertPoint(toView: CGPoint(x: seekLabel.frame.minX, y: seekLabel.frame.minY)) seekSlider.frame = CGRect(origin: seekOrigin, size: CGSize(width: 200, height: 15)) //Configure vol slider: volSlider.addTarget(self, action: #selector(volSliderChangedValue), for: UIControlEvents.valueChanged) volSlider.value = 1 let volOrigin = convertPoint(toView: CGPoint(x: volLabel.frame.minX, y: volLabel.frame.minY)) volSlider.frame = CGRect(origin: volOrigin, size: CGSize(width: 200, height: 15)) //Scene stuff: view.addSubview(seekSlider) view.addSubview(volSlider) addChild(seekLabel) addChild(volLabel) addChild(videoNode) // Start video and animation: videoNode.alpha = 0 videoNode.play() videoNode.run(.fadeIn(withDuration: 5)) } }