iOS ---App 开屏视频 （播放本地视频资源）

1.封装一个视频播放的 UIView 在AppDelegate的didFinishLaunchingWithOptions方法中 添加到kWindow

        //启动视频
        let launchView = LaunchAnimationView(frame: CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight))
        kWindow.addSubview(launchView)
        //layer其实是三维空间的，而不是简单的二维,z轴的position初始值都是0 所以z轴的值越大，表示在图层的越上方
         launchView.layer.zPosition = 10088 

2.封装的View 中的代码

  //背景图
 lazy var bgImgView: UIImageView = {
    
    
        let view = UIImageView(frame: CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight))
        view.image = UIImage(named: "vb_start_img")
        return view
    }()
    
    var timer:Timer?
    
    override init(frame: CGRect) {
    
    
        super.init(frame: frame)
        config()
    }
    
    required init?(coder: NSCoder) {
    
    
        fatalError("init(coder:) has not been implemented")
    }
    
    func config() {
    
    
        addSubview(bgImgView)
        //音频播放
        Utilstool.play(name: "welcome_music",type: "caf")
        //视频播放
        let path = Bundle.main.path(forResource: "welcome_video", ofType: "mp4")
        if let filePath = path {
    
    
            let url = URL(fileURLWithPath: filePath)
            let item = AVPlayerItem(url: url)
            let player = AVPlayer(playerItem: item)
            let layer = AVPlayerLayer(player: player)
            //为了去除边线
            //使playerLayer光栅化(即位图化)，关闭了图层的blending。
            layer.shouldRasterize = true
            //显式指定光栅化的范围，这样能保证视频的显示质量，不然容易出现视频质量
            layer.rasterizationScale = UIScreen.main.scale
            layer.frame = CGRect(x: 0, y: 0, width: kScreenWidth, height: kScreenHeight)
            layer.videoGravity = .resizeAspect
            self.layer.addSublayer(layer)
            player.play()
            var timeCount = 0
            
            //播放时间 到了 移除控件
            timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: {
    
     t in
                timeCount += 1
                if timeCount >= 4 {
    
    
                    self.removeFromSuperview()
                    self.timer!.invalidate()
                    self.timer = nil
                }
                print(t)
            })
 
        }
    }

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