How to draw a “speech bubble” on an iPhone?

Question

I\'m trying to get a \"speech bubble\" effect similar to the one in Mac OS X when you right click on something in the dock. Here\'s what I have now:

Answer 1

Here is the swift 3 solution of Brad Larson

override func draw(_ rect: CGRect) {
        super.draw(rect) // optional if a direct UIView-subclass, should be called otherwise.

        let HEIGHTOFPOPUPTRIANGLE:CGFloat = 20.0
        let WIDTHOFPOPUPTRIANGLE:CGFloat = 40.0
        let borderRadius:CGFloat = 8.0
        let strokeWidth:CGFloat = 3.0

        // Get the context
        let context: CGContext = UIGraphicsGetCurrentContext()!
        context.translateBy(x: 0.0, y: self.bounds.size.height)
        context.scaleBy(x: 1.0, y: -1.0)
        //
        let currentFrame: CGRect = self.bounds
        context.setLineJoin(CGLineJoin.round)
        context.setLineWidth(strokeWidth)
        context.setStrokeColor(UIColor.white.cgColor)
        context.setFillColor(UIColor.black.cgColor)
        // Draw and fill the bubble
        context.beginPath()

        context.move(to: CGPoint(x: borderRadius + strokeWidth + 0.5, y: strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5))

            context.addLine(to: CGPoint(x: round(currentFrame.size.width / 2.0 - WIDTHOFPOPUPTRIANGLE / 2.0) + 0.5, y: HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5))
        context.addLine(to: CGPoint(x: round(currentFrame.size.width / 2.0) + 0.5, y: strokeWidth + 0.5))
        context.addLine(to: CGPoint(x: round(currentFrame.size.width / 2.0 + WIDTHOFPOPUPTRIANGLE / 2.0) + 0.5, y: HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5))

        context.addArc(tangent1End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5), tangent2End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: currentFrame.size.height - strokeWidth - 0.5), radius: borderRadius - strokeWidth)

        context.addArc(tangent1End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: currentFrame.size.height - strokeWidth - 0.5) , tangent2End: CGPoint(x: round(currentFrame.size.width / 2.0 + WIDTHOFPOPUPTRIANGLE / 2.0) - strokeWidth + 0.5, y: currentFrame.size.height - strokeWidth - 0.5) , radius: borderRadius - strokeWidth)

        context.addArc(tangent1End: CGPoint(x: strokeWidth + 0.5, y: currentFrame.size.height - strokeWidth - 0.5), tangent2End: CGPoint(x: strokeWidth + 0.5, y: HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5), radius: borderRadius - strokeWidth)

        context.addArc(tangent1End: CGPoint(x: strokeWidth + 0.5, y :strokeWidth + HEIGHTOFPOPUPTRIANGLE + 0.5), tangent2End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5 ,y: HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5), radius: borderRadius - strokeWidth)

        context.closePath()
        context.drawPath(using: CGPathDrawingMode.fillStroke)

        // Draw a clipping path for the fill
        context.beginPath()

        context.move(to: CGPoint(x: borderRadius + strokeWidth + 0.5, y: round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50) + 0.5))
        context.addArc(tangent1End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50) + 0.5), tangent2End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: currentFrame.size.height - strokeWidth - 0.5), radius: borderRadius - strokeWidth)

        context.addArc(tangent1End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: currentFrame.size.height - strokeWidth - 0.5) , tangent2End: CGPoint(x: round(currentFrame.size.width / 2.0 + WIDTHOFPOPUPTRIANGLE / 2.0) - strokeWidth + 0.5, y: currentFrame.size.height - strokeWidth - 0.5), radius: borderRadius - strokeWidth)
        context.addArc(tangent1End: CGPoint(x: strokeWidth + 0.5, y: currentFrame.size.height - strokeWidth - 0.5), tangent2End: CGPoint(x: strokeWidth + 0.5, y: HEIGHTOFPOPUPTRIANGLE + strokeWidth + 0.5), radius: borderRadius - strokeWidth)
        context.addArc(tangent1End: CGPoint(x: strokeWidth + 0.5, y: round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50) + 0.5), tangent2End: CGPoint(x: currentFrame.size.width - strokeWidth - 0.5, y: round((currentFrame.size.height + HEIGHTOFPOPUPTRIANGLE) * 0.50) + 0.5), radius: borderRadius - strokeWidth)

        context.closePath()
        context.clip()
    }