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func computeMonteCarlo(iterations: Int) {

    DispatchQueue.concurrentPerform(iterations: iterations) { _ in
                                                             
        // Here's were the calculation happens. Omitted for brevity.

        DispatchQueue.main.async {
            self.monteCarloGraph.addSubview(point)
            // Lines that need to be updated.
            let pi = 4.0 * Double(self.nPointsInside) / Double(self.nIterations)
            self.piLabel.text = String(pi)
        }
    }
}