Pong Screensaver Full Code

PongView.swift

import ScreenSaver

class PongView: ScreenSaverView {

    private var ballPosition: CGPoint = .zero
    private var ballVelocity: CGVector = .zero
    private var paddlePosition: CGFloat = 0
    private let ballRadius: CGFloat = 15
    private let paddleBottomOffset: CGFloat = 100
    private let paddleSize = NSSize(width: 60, height: 20)

    // MARK: - Initialization

    override init?(frame: NSRect, isPreview: Bool) {
        super.init(frame: frame, isPreview: isPreview)
        ballPosition = CGPoint(x: frame.width / 2, y: frame.height / 2)
        ballVelocity = initialVelocity()
    }

    @available(*, unavailable)
    required init?(coder decoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Lifecycle

    override func draw(_ rect: NSRect) {
        drawBackground(.white)
        drawBall()
        drawPaddle()
    }

    override func animateOneFrame() {
        super.animateOneFrame()

        let oobAxes = ballIsOOB()
        if oobAxes.xAxis {
            ballVelocity.dx *= -1
        }
        if oobAxes.yAxis {
            ballVelocity.dy *= -1
        }

        let paddleContact = ballHitPaddle()
        if paddleContact {
            ballVelocity.dy *= -1
        }

        ballPosition.x += ballVelocity.dx
        ballPosition.y += ballVelocity.dy
        paddlePosition = ballPosition.x

        setNeedsDisplay(bounds)
    }

    // MARK: - Helper Functions

    private func drawBackground(_ color: NSColor) {
        let background = NSBezierPath(rect: bounds)
        color.setFill()
        background.fill()
    }

    private func drawBall() {
        let ballRect = NSRect(x: ballPosition.x - ballRadius,
                              y: ballPosition.y - ballRadius,
                              width: ballRadius * 2,
                              height: ballRadius * 2)
        let ball = NSBezierPath(roundedRect: ballRect,
                                xRadius: ballRadius,
                                yRadius: ballRadius)
        NSColor.black.setFill()
        ball.fill()
    }

    private func drawPaddle() {
        let paddleRect = NSRect(x: paddlePosition - paddleSize.width / 2,
                                y: paddleBottomOffset - paddleSize.height / 2,
                                width: paddleSize.width,
                                height: paddleSize.height)
        let paddle = NSBezierPath(rect: paddleRect)
        NSColor.black.setFill()
        paddle.fill()
    }

    private func initialVelocity() -> CGVector {
        let desiredVelocityMagnitude: CGFloat = 10
        let xVelocity = CGFloat.random(in: 2.5...7.5)
        let xSign: CGFloat = Bool.random() ? 1 : -1
        let yVelocity = sqrt(pow(desiredVelocityMagnitude, 2) - pow(xVelocity, 2))
        let ySign: CGFloat = Bool.random() ? 1 : -1
        return CGVector(dx: xVelocity * xSign, dy: yVelocity * ySign)
    }

    private func ballIsOOB() -> (xAxis: Bool, yAxis: Bool) {
        let xAxisOOB = ballPosition.x - ballRadius <= 0 ||
            ballPosition.x + ballRadius >= bounds.width
        let yAxisOOB = ballPosition.y - ballRadius <= 0 ||
            ballPosition.y + ballRadius >= bounds.height
        return (xAxisOOB, yAxisOOB)
    }

    private func ballHitPaddle() -> Bool {
        let xBounds = (lower: paddlePosition - paddleSize.width / 2,
                       upper: paddlePosition + paddleSize.width / 2)
        let yBounds = (lower: paddleBottomOffset - paddleSize.height / 2,
                       upper: paddleBottomOffset + paddleSize.height / 2)
        return ballPosition.x >= xBounds.lower &&
            ballPosition.x <= xBounds.upper &&
            ballPosition.y - ballRadius >= yBounds.lower &&
            ballPosition.y - ballRadius <= yBounds.upper
    }

}

I follow your instructions on your medium post, but when i click build/run it says its Build Succeeded, but I dont see this Pong.Saver file. Any idea what I'm doing wrong?

@kevando Did you find the reason? I am also facing the same.

@kevando @AjayChandran11 Found the solution for this from chriswaco on reddit

Apple changed the way to find build products.

If you want the debug version, select "Show Build Folder in Finder" from the "Product" menu.

If you want a release version, select "Archive" from the "Product" menu and when done select "Organizer" from the "Window" menu and choose "Export".