Notes

mport UIKit

protocol SettingsVCDelegate:class {
func settingsViewControllerDidFinish(_ settingVC:SettingVC)
}

class SettingVC: UIViewController {

@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var brushSizeLabel: UILabel!
@IBOutlet weak var opacityLabel: UILabel!
@IBOutlet weak var redLabel: UILabel!
@IBOutlet weak var blueLabel: UILabel!
@IBOutlet weak var greenLabel: UILabel!


@IBOutlet weak var greenSlider: UISlider!
@IBOutlet weak var blueSlider: UISlider!
@IBOutlet weak var redSlider: UISlider!

var red:CGFloat = 0.0
var blue:CGFloat = 0.0
var green:CGFloat = 0.0
var brushSize:CGFloat = 5.0
var opacityValue:CGFloat = 1.0

var delegate:SettingsVCDelegate?

override func viewDidLoad() {
super.viewDidLoad()

drawPreview(red: red, blue: blue, green: green)
redSlider.value = Float(red)
redLabel.text = String(Int(redSlider.value * 255))

blueSlider.value = Float(blue)
blueLabel.text = String(Int(blueSlider.value * 255))

greenSlider.value = Float(green)
greenLabel.text = String(Int(greenSlider.value * 255))


// Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

@IBAction func backBtn(_ sender: Any) {
if delegate != nil{
delegate?.settingsViewControllerDidFinish(self)
}
dismiss(animated: true, completion: nil)
}

@IBAction func brushSizeChanged(_ sender: Any) {
let slider = sender as! UISlider
brushSize = CGFloat(slider.value)
drawPreview(red: red, blue: blue, green: green)
}

@IBAction func opacityChanged(_ sender: Any) {
let slider = sender as! UISlider
opacityValue = CGFloat(slider.value)
drawPreview(red: red, blue: blue, green: green)
}

@IBAction func redSliderChanged(_ sender: Any) {
let slider = sender as! UISlider
red = CGFloat(slider.value)
drawPreview(red: red, blue: blue, green: green)
redLabel.text = "(Int(slider.value * 255))"

}

@IBAction func blueSliderChanged(_ sender: Any) {
let slider = sender as! UISlider
blue = CGFloat(slider.value)
drawPreview(red: red, blue: blue, green: green)
blueLabel.text = "(Int(slider.value * 255))"
}

@IBAction func greenSliderChanged(_ sender: Any) {
let slider = sender as! UISlider
green = CGFloat(slider.value)
drawPreview(red: red, blue: blue, green: green)
greenLabel.text = "(Int(slider.value * 255))"
}

func drawPreview(red:CGFloat, blue:CGFloat, green:CGFloat){
//imageView.backgroundColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0)
UIGraphicsBeginImageContext(imageView.frame.size)
let context = UIGraphicsGetCurrentContext()

context?.setStrokeColor(UIColor(red: red, green: green, blue: blue, alpha: opacityValue).cgColor)
context?.setLineWidth(brushSize)
context?.setLineCap(CGLineCap.round)

context?.move(to: CGPoint(x:70, y:70))
context?.addLine(to: CGPoint(x:70, y:70))
context?.strokePath()

imageView.image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}