Function to create a round rect CGPath

CGPathCreateRoundRect.m

CGPathRef CGPathCreateRoundRect( const CGRect r, const CGFloat cornerRadius )
{
	CGMutablePathRef p = CGPathCreateMutable() ;
	
	CGPathMoveToPoint( p, NULL, r.origin.x + cornerRadius, r.origin.y ) ;
	
	CGFloat maxX = CGRectGetMaxX( r ) ;
	CGFloat maxY = CGRectGetMaxY( r ) ;
	
	CGPathAddArcToPoint( p, NULL, maxX, r.origin.y, maxX, r.origin.y + cornerRadius, cornerRadius ) ;
	CGPathAddArcToPoint( p, NULL, maxX, maxY, maxX - cornerRadius, maxY, cornerRadius ) ;
	
	CGPathAddArcToPoint( p, NULL, r.origin.x, maxY, r.origin.x, maxY - cornerRadius, cornerRadius ) ;
	CGPathAddArcToPoint( p, NULL, r.origin.x, r.origin.y, r.origin.x + cornerRadius, r.origin.y, cornerRadius ) ;
	
	return p ;
}

Swift code:

 let path = UIBezierPath(roundedRect: rect, byRoundingCorners: .allCorners, cornerRadii: CGSize(width: 2, height: 8)).cgPath