so my code is: import UIKit class CanvasView: UIView { let originX: CGFloat = 150 let originY: CGFloat = 300 let squareSide: CGFloat = 100 var rubiksCubeDelegate: RubiksCubeDelegate? = nil var fromCol: Int = -1 var fromRow: Int = -1 override func draw(_ rect: CGRect) { drawFront() drawTop() drawRight() } override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { let firstTouch = touches.first! let fingerLocation = firstTouch.location(in: self) fromCol = Int((fingerLocation.x - originX) / squareSide) fromRow = Int((fingerLocation.y - originY) / squareSide) } override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { let firstTouch = touches.first! let fingerLocation = firstTouch.location(in: self) let toCol: Int = Int((fingerLocation.x - originX) / squareSide) let toRow: Int = Int((fingerLocation.y - originY) / squareSide) print("V: from (\(fromCol), \(fromRow) to (\(toCol), \(toRow))") rubiksCubeDelegate?.moveFinger(fromCol: fromCol, fromRow: fromRow, toCol: toCol, toRow: toRow) } func drawFront() { drawsquare(col: 0, row: 0, color: .green) drawsquare(col: 1, row: 0, color: .orange) drawsquare(col: 2, row: 0, color: .blue) drawsquare(col: 0, row: 1, color: .white) drawsquare(col: 1, row: 1, color: .yellow) drawsquare(col: 2, row: 1, color: .red) drawsquare(col: 0, row: 2, color: .green) drawsquare(col: 1, row: 2, color: .blue) drawsquare(col: 2, row: 2, color: .orange) } func drawTop() { drawTopParallelogram(col: 0, row: 0, color: .red) drawTopParallelogram(col: 0, row: 1, color: .blue) drawTopParallelogram(col: 0, row: 2, color: .green) drawTopParallelogram(col: 1, row: 0, color: .yellow) drawTopParallelogram(col: 1, row: 1, color: .red) drawTopParallelogram(col: 1, row: 2, color: .white) drawTopParallelogram(col: 2, row: 0, color: .blue) drawTopParallelogram(col: 2, row: 1, color: .orange) drawTopParallelogram(col: 2, row: 2, color: .green) } func drawRight() { drawRightParallelogram(col: 0, row: 0, color: .orange) drawRightParallelogram(col: 1, row: 0, color: .red) drawRightParallelogram(col: 2, row: 0, color: .red) drawRightParallelogram(col: 0, row: 1, color: .blue) drawRightParallelogram(col: 1, row: 1, color: .orange) drawRightParallelogram(col: 2, row: 1, color: .white) drawRightParallelogram(col: 0, row: 2, color: .white) drawRightParallelogram(col: 1, row: 2, color: .blue) drawRightParallelogram(col: 2, row: 2, color: .green) } func drawRightParallelogram(col: Int, row: Int,color: CubeColor) { colorOf(color: color).setFill() let topLeftX: CGFloat = originX + 3 * squareSide + CGFloat(col) * squareSide/2 let topLeftY: CGFloat = originY - CGFloat(col) * squareSide/2 + CGFloat(row) * squareSide let path = UIBezierPath() path.move(to: CGPoint(x: topLeftX, y: topLeftY)) path.addLine(to: CGPoint(x: topLeftX + squareSide/2, y: topLeftY - squareSide/2)) path.addLine(to: CGPoint(x: topLeftX + squareSide/2, y: topLeftY + squareSide/2)) path.addLine(to: CGPoint(x: topLeftX, y: topLeftY + squareSide)) path.close() path.fill() path.stroke() } func drawTopParallelogram(col: Int, row: Int,color: CubeColor) { colorOf(color: color).setFill() let bottomLeftX: CGFloat = originX + CGFloat(col) * squareSide + CGFloat(2 - row) * squareSide/2 let bottomLeftY: CGFloat = originY + CGFloat(row - 2)*squareSide/2 let path = UIBezierPath() path.move(to: CGPoint(x: bottomLeftX, y: bottomLeftY )) path.addLine(to: CGPoint(x: bottomLeftX + squareSide/2,y: bottomLeftY - squareSide/2)) path.addLine(to: CGPoint(x: bottomLeftX + squareSide/2 + squareSide, y: bottomLeftY - squareSide/2)) path.addLine(to: CGPoint(x: bottomLeftX + squareSide, y: bottomLeftY)) path.close() path.fill() path.stroke() } func drawsquare(col: Int, row: Int,color: CubeColor) { colorOf(color: color).setFill() let squareX: CGFloat = originX + CGFloat(col) * squareSide let squareY: CGFloat = originY + CGFloat(row) * squareSide let square = UIBezierPath(rect: CGRect(x: squareX, y:squareY, width:squareSide, height:squareSide)) square.fill() square.stroke() } func colorOf(color: CubeColor) -> UIColor { var c: UIColor = .black switch color { case .blue: c = UIColor.blue case .green: c = UIColor.green case .orange: c = UIColor.orange case .red: c = UIColor.red case .white: c = UIColor.white case .yellow: c = UIColor.yellow } return c } } at "func drawFront() {" it said "Thread 1: breakpoint 1.1 (1)" can any one help me fix this the app is always pausing