Example code for article about drawing - Reset + Export

Reset+Export.swift

func resetDrawing() {

    // 1
    lineArray = []
    setNeedsDisplay()
}

func exportDrawing() -> UIImage? {

    // 2
    UIGraphicsBeginImageContext(frame.size)
    guard let context = UIGraphicsGetCurrentContext() else { return nil }
    
    // 3
    draw(inContext: context)
    
    // 4
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image
}