objective-c: draw line on top of UIImage or UIImageView

Question

How do I draw a simple line on top of a UIImage or UIImageView?

Answer 1

For Swift 3.0

    UIGraphicsBeginImageContext(originalImage.size)
    originalImage.draw(at: CGPoint(x: 0, y: 0))
    let context = UIGraphicsGetCurrentContext()!
    context.setLineWidth(2)
    context.move(to: CGPoint(x: 0, y: originalImage.size.height - 2))
    context.addLine(to: CGPoint(x: originalImage.size.width, y: originalImage.size.height - 2))
    context.setStrokeColor(UIColor.red.cgColor)
    context.strokePath()
    let finalImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()