NSView Subclass Template Playground (Swift 4.1, Xcode 9.3)

customViewPlayground.swift

//: Playground - noun: a place where people can play
// Swift 4.1, Xcode 9.3

import Cocoa
import PlaygroundSupport

class CustomView: NSView {
    override func draw(_ dirtyRect: NSRect) {
        // Add your drawing code here.

    }
}


let customView = CustomView(frame: NSRect(x: 0, y: 0, width: 400, height: 400))

PlaygroundPage.current.liveView = customView