I am working on a drawing app where the user draws something on a view. On the same view controller I would like to create a button that would erase everything that was on the view and give it a blank slate. How would I do this? I added all of my code that is attached to the uiview to draw the object.
@IBOutlet weak var jj: draw!
@IBAction func enterScore(_ sender: Any) {}
Code for drawing pen below
import UIKit
struct stroke {
let startPoint: CGPoint
let endPoint: CGPoint
let color: CGColor
}
class drawViewSwift: subClassOFUIVIEW {
var isDrawing = false
var lastPoint : CGPoint!
var strokeColor : CGColor = UIColor.black.cgColor
var storkes = [stroke]()
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
guard !isDrawing else {return}
isDrawing = true
guard let touch = touches.first else {return}
let currentPoint = touch.location(in: self)
lastPoint = currentPoint
setNeedsDisplay()
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard isDrawing else {return}
guard let touch = touches.first else {return}
setNeedsDisplay()
let currentPoint = touch.location(in: self)
print(currentPoint)
let sstroke = stroke(startPoint: lastPoint, endPoint: currentPoint, color: strokeColor)
storkes.append(sstroke)
lastPoint = currentPoint
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
guard isDrawing else {return}
isDrawing = false
guard let touch = touches.first else {return}
let currentPoint = touch.location(in: self)
let sstroke = stroke(startPoint: lastPoint, endPoint: currentPoint, color: strokeColor)
storkes.append(sstroke)
lastPoint = nil
setNeedsDisplay()
print(currentPoint)
}
override func draw(_ rect: CGRect) {
let context = UIGraphicsGetCurrentContext()
context?.setLineWidth(10)
context?.setLineCap(.round)
for stroke in storkes {
context?.beginPath()
context?.move(to:stroke.startPoint)
context?.addLine(to: stroke.endPoint)
context?.setStrokeColor(stroke.color)
context?.strokePath()
}
setNeedsDisplay()
}
func crase() {
storkes = []
strokeColor = UIColor.black.cgColor
setNeedsDisplay()
}
}
class subClassOFUIVIEW: UIView {
override func awakeFromNib() {
layer.shadowOpacity = 1
layer.shadowRadius = 1
layer.shadowOffset = CGSize(width: 1, height: 1)
layer.shadowColor = UIColor.black.cgColor
layer.shadowPath = CGPath(rect: bounds, transform: nil)
layer.shadowPath = CGPath(rect: bounds, transform: nil)
}}