Draw a Line with Uibezierpath

Draw a line with UIBezierPath

Ended up doing it this way:

func drawLineFromPoint(start : CGPoint, toPoint end:CGPoint, ofColor lineColor: UIColor, inView view:UIView) {
    
    //design the path
    let path = UIBezierPath()
    path.move(to: start)
    path.addLine(to: end)
    
    //design path in layer
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.cgPath
    shapeLayer.strokeColor = lineColor.CGColor
    shapeLayer.lineWidth = 1.0
    
    view.layer.addSublayer(shapeLayer)
}

Drawing a line in Swift 3.x with UIBezierPath

I use this to draw a line:

    let doYourPath = UIBezierPath(rect: CGRect(x: xPos, y: yPos, width: yourWidth, height: yourHeight))
    let layer = CAShapeLayer()
    layer.path = doYourPath.cgPath
    layer.strokeColor = UIColor.white.cgColor
    layer.fillColor = UIColor.white.cgColor

    self.view.layer.addSublayer(layer)

Hope this help you out. This is just one the way to draw a line in swift.

How to stretch a line which is drawn using UIBezierPath?

Try using properties to store the points you want to change and recreate the path when needed.

class FileViewController: UIViewController {
    let line = CAShapeLayer()
    var point1 = CGPoint.zero
    var point2 = CGPoint.zero

    func DrawLine() {
        point1 = CGPoint(x: 100, y: 100)
        point2 = CGPoint(x: self.view.frame.width - 100, y: 100)

        let linePath = UIBezierPath()
        linePath.move(to: point1)
        linePath.addLine(to: point2)

        line.path = linePath.cgPath
        line.strokeColor = UIColor.red.cgColor
        line.lineWidth = 1
        line.lineJoin = kCALineJoinRound
        self.view.layer.addSublayer(line)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        DrawLine()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        point1.x -= 10
        point2.x += 10

        let linePath = UIBezierPath()
        linePath.move(to: point1)
        linePath.addLine(to: point2)

        line.path = linePath.cgPath
    }
}

draw line using uibezierPath in a vertical way

Actually you move on to startPoint and trying to add line to the same static point ... how it can add line to the same point on which you are currently residing ... add some value to Y while static X position position to add line

 bezier.move(to: startPoint!)
  bezier.addLine(to: CGPoint(x: startPoint!.x, y: point.y))

How to move a line created with UIBezierPath?

This is because you are not starting the line you are drawing from CGPoint.zero. Change

linePath.move(to: to: CGPoint(x: 100, y: 100)
linePath.addLine(to: CGPoint(x: self.view.frame.width - 100, y: 100))

to

linePath.move(to: .zero)
linePath.addLine(to: CGPoint(x: 100, y: 0))

how can i draw straight line using UIBezierPath in ios

Try this:

@implementation View

{
NSMutableArray paths;
UIBezierPath *currentPath;
CGPoint startPoint;
}

- (id)initWithCoder:(NSCoder *)aDecoder // (1)
{
if (self = [super initWithCoder:aDecoder])
{
    [self setMultipleTouchEnabled:NO]; // (2)
    [self setBackgroundColor:[UIColor whiteColor]];
    paths = [NSMutableArray array];
}
return self;
}

- (void)drawRect:(CGRect)rect // (5)
{
[[UIColor blackColor] setStroke];
for(UIBezierPath *path in paths) {
    [path stroke];
}
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
startPoint = [touch locationInView:self];
currentPath = [UIBezierPath bezierPath];
[currentPath setLineWidth:5.0];
[paths addObject:currentPath];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
[currentPath removeAllPoints];
[currentPath moveToPoint:startPoint];
[currentPath addLineToPoint:p]; // (4)
[self setNeedsDisplay];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
 [self touchesMoved:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
 [self touchesEnded:touches withEvent:event];
}

Erase UIBezierPath

I managed to solve this using CGContext.

@objc private func didPanWhiteboard(_ gesture: UIPanGestureRecognizer) {
    switch gesture.state {
        case .began:
            drawingState = .began
            lastPoint = gesture.location(in: drawingBoardImageView)
        case .changed:
            drawingState = .moved
            let currentPoint = gesture.location(in: drawingBoardImageView)
            drawLineFrom(fromPoint: lastPoint, toPoint: currentPoint)
            lastPoint = currentPoint
        case .cancelled, .ended:
            drawingState = .ended
            drawLineFrom(fromPoint: lastPoint, toPoint: lastPoint)
        default: break
    }
}

private func drawLineFrom(fromPoint: CGPoint, toPoint: CGPoint) {
    UIGraphicsBeginImageContext(drawingBoardImageView.frame.size)
    let context = UIGraphicsGetCurrentContext()
    tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: drawingBoardImageView.frame.size.width, height: drawingBoardImageView.frame.size.height))
    context?.move(to: fromPoint)
    context?.addLine(to: toPoint)
    context?.setLineCap(brush.lineCap)
    context?.setAlpha(brush.opacity)
    context?.setLineWidth(brush.width)
    context?.setStrokeColor(brush.color.cgColor)
    if shouldErase {
        context?.setBlendMode(.clear)
    } else {
        context?.setBlendMode(.normal)
    }
    context?.strokePath()
    guard let image = UIGraphicsGetImageFromCurrentImageContext() else { return }
    if drawingState == .ended {
        drawingUndoManager.registerForUndo(image)
    }
    tempImageView.image = image
    tempImageView.alpha = 1.0
    UIGraphicsEndImageContext()
}

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