Swift draw rectangle

Question

I am trying to draw a rectangle on touch. So far I have two pieces of code, the fist one is a method that currently draws a circle, the 2nd piece of code adds the shape to view, how do I draw a rectangle instead?

func drawRectangle() {
    // Get the Graphics Context
    let context = UIGraphicsGetCurrentContext();

    // Set the rectangle outerline-width
    CGContextSetLineWidth(context, 5.0);

    // Set the rectangle outerline-colour
    UIColor.redColor().set()

    // Create Rectangle

    CGContextAddArc(context, (frame.size.width)/2, frame.size.height/2, (frame.size.width - 10)/2, 0.0, CGFloat(M_PI * 2.0), 1)

    // Draw
    CGContextStrokePath(context);
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

    let rectangleCenter = touches.first!.locationInView(view)

    let rectangleWidth = CGFloat(50)
    let rectangleHeight = rectangleWidth

    // Create a new rectangleView
    let rectangleView = Annotations(frame: CGRectMake(rectangleCenter.x, rectangleCenter.y, rectangleWidth, rectangleHeight), shape: 1)

    view.addSubview(rectangleView)  
}

I have tried the following:

// Create Rectangle
        CGContextAddRect(context, CGRectMake((frame.size.width)/2, frame.size.height/2, 40, 40));

it creates part of the top left of the rectangle with the line on top and a line down the left. How do I adjust this to be a full rectangle?

Answer 1

I was able to solve my problem by doing the following:

increase the width and height here:

let rectangleWidth = CGFloat(100)
let rectangleHeight = rectangleWidth

and my rectangle method

func drawRectangle()
    {
        // Get the Graphics Context
        let context = UIGraphicsGetCurrentContext();

        // Set the rectangle outerline-width
        CGContextSetLineWidth(context, 5.0);

        // Set the rectangle outerline-colour
        UIColor.redColor().set()

        // Create Rectangle
        CGContextAddRect(context, CGRectMake(0, 0, 100, 100));

        // Draw
        CGContextStrokePath(context);

    }

for swift 4.2 :

this code uses for swift 4.2

func drawRectangle()
{
    // Get the Graphics Context
    let context = UIGraphicsGetCurrentContext()

    // Set the rectangle outerline-width
    context?.setLineWidth( 5.0)

    // Set the rectangle outerline-colour
    UIColor.red.set()

    // Create Rectangle
    context?.addRect( CGRect(x: 0, y: 0, width: 100, height: 100))

    // Draw
    context?.strokePath()

}