Always on the Top, click through transparent window in Swift

gistfile1.txt

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!


    func applicationDidFinishLaunching(_ aNotification: Notification) {
        
        self.window!.isOpaque = false;
        
        self.window!.alphaValue = 0.7;
        
        self.window!.level = Int(CGWindowLevelKey.draggingWindow.rawValue)
        
        self.window!.collectionBehavior = NSWindowCollectionBehavior.stationary
        
        self.window.ignoresMouseEvents = true
    }
    
    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }
}