調色大師|Ted

利用IBOutlet與IBAction概念，用Slider調色。

先找到一個學長文章解釋IBOutlet與IBAction概念，一張圖就可以清楚說明：

了解概念後，做了一個簡易的RGB+alpha的圖形調色。

程式碼：

import UIKit
class ViewController: UIViewController {
@IBOutlet weak var dogview: UIImageView!
@IBOutlet weak var redslider: UISlider!
@IBOutlet weak var greenslider: UISlider!
@IBOutlet weak var blueslider: UISlider!
@IBOutlet weak var alphaslider: UISlider!
@IBAction func redsliderchange(_ sender: Any) {
dogview.backgroundColor = UIColor(red: CGFloat(redslider.value), green: CGFloat(greenslider.value), blue: CGFloat(blueslider.value), alpha:CGFloat(alphaslider.value) )
}
@IBAction func greensliderchange(_ sender: Any) {
dogview.backgroundColor = UIColor(red: CGFloat(redslider.value), green: CGFloat(greenslider.value), blue: CGFloat(blueslider.value), alpha:CGFloat(alphaslider.value) )
}
@IBAction func bluesliderchange(_ sender: Any) {
dogview.backgroundColor = UIColor(red: CGFloat(redslider.value), green: CGFloat(greenslider.value), blue: CGFloat(blueslider.value), alpha:CGFloat(alphaslider.value) )
}
@IBAction func alphasliderchange(_ sender: Any) {
dogview.backgroundColor = UIColor(red: CGFloat(redslider.value), green: CGFloat(greenslider.value), blue: CGFloat(blueslider.value), alpha:CGFloat(alphaslider.value) )
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
}

重點注意：

1. 程式碼outlet到要變色的圖片上，畫面操作Slider的Action回程式碼中。
2. IBAction的顏色轉換直接丟給相對應的slider。
3. 型別CGFloat。