BezierPath in Swift Using Playgrounds

Question

Do I have to create a custom class in order to use the BezierPath in the Swift playgrounds?

The following code displays nothing but black background:

import UIKit
import XCPlayground

class GraphView : UIView {

    override func drawRect(rect: CGRect) {

        let path = UIBezierPath(rect: rect)
        path.moveToPoint(CGPointMake(0,0))
        path.addLineToPoint(CGPointMake(50,100))
        path.closePath()
        UIColor.redColor().setFill()

        path.stroke()
    }

}


let graphView = GraphView(frame: CGRectMake(0,0,960,640))

Answer 1

You have to use this at the end of your code:

XCPlaygroundPage.currentPage.liveView = graphView

and to open the Playground's "Assistant Editor" to see the result.

And also to change the background color of the view since it's black... and your line is also black. ;)

Answer 2

In Swift 5:

import UIKit

class GraphView : UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = .white
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func draw(_ rect: CGRect) {
        let path = UIBezierPath(rect: rect)
        path.move(to: CGPoint(x: 0, y: 0))
        path.addLine(to: CGPoint(x: 50, y: 100))
        path.stroke()
    }

}

let graphView = GraphView(frame: CGRect(x: 0, y: 0, width: 960, height: 640))

Swift 5.2, Xcode 11.4