DynoPaper

AppDelegate.swift

import Cocoa
import AVKit

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!
    var videoWindow: NSWindow!
    var playerLooper: AVPlayerLooper?

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        window.orderOut(nil)
        let url = Bundle.main.url(forResource: "sakura", withExtension: "mp4")!
        let frame = NSScreen.main!.frame

        let player = AVQueuePlayer()
        let layer = AVPlayerLayer(player: player)
        let playerItem = AVPlayerItem(url: url)
        playerLooper = AVPlayerLooper(player: player, templateItem: playerItem)

        layer.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)

        videoWindow = NSWindow(contentRect: frame, styleMask: .borderless, backing: .buffered, defer: false)
        videoWindow.collectionBehavior = .canJoinAllSpaces
        videoWindow.level = NSWindow.Level(rawValue: Int(CGWindowLevelForKey(CGWindowLevelKey.desktopWindow)))
        videoWindow.orderFront(nil)
        videoWindow.backgroundColor = NSColor.clear
        videoWindow.contentView?.wantsLayer = true
        videoWindow.contentView?.layer?.addSublayer(layer)

        player.play()
    }
}