Single File Swift 3 Gui Sample

main.swift

// A reminder to myself on how to quickly create a throw away gui app on OSX (i.e. a single file, 
// w/o relying on XCode project templates

//Notes: In general it is hard to know how to create a Cocoa based gui without using XCode.
//This issue has existed for both Objective-C and now Swift

//Furthermore, Swift<-->Cocoa syntax has changed dramatically over various Swift versions, 
//making stackoverflow posts unreliable

//This file provides a template for creating a throw away gui app

//Status: macOS only -- throw away apps for devices have many non-trivial aspects

//Status: This currenty works under swift 3 + package manager (just replace the main.swift generated
// with swift init --executable with this file
// However, it is not currently Swifty 

//todo:
// add metal custom view or sprite kit demo to demonstrate using more frameworks

import Cocoa

print("Hello, world!")

//todo: remind myself what this does
NSApplication.shared()

//#1 status bar
let statusItem = NSStatusBar.system().statusItem(withLength: NSVariableStatusItemLength)
statusItem.title = "Quit"
statusItem.action = #selector(NSApplication.terminate)


//#2 random window (not the typical pattern)
let window = NSWindow(contentRect: NSMakeRect(0, 0, 320, 200),
                      styleMask: .titled,
                      backing: .buffered,
                      defer: true)
window.orderFrontRegardless()


//#3 App delegate (more typical pattern)
class AppDel: NSObject, NSApplicationDelegate {
    var mainWindow: NSWindow?

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        print("Finished Launching")


        let window = NSWindow(contentRect: NSMakeRect(800, 600, 320, 200),
                              styleMask: [.titled, .closable],
                              backing: .buffered,
                              defer: true)
        window.orderFrontRegardless()
        self.mainWindow = window

        NSApp.activate(ignoringOtherApps: true)
    }

    func applicationShouldTerminateAfterLastWindowClosed(_ app: NSApplication) -> Bool {
        return true
    }
}

NSApp.setActivationPolicy(.regular)

let del = AppDel()
NSApp.delegate = del

NSApp.run()