从另一个类Delaware获取UIColor

Question

我想在我的应用程序中实现类HSBColorPicker。我有一切编译和运行，就像我想要的那样，但是我卡住的地方是试图从HSBColorPicker类获取颜色信息，并在我的其他类中使用它。这里是我的应用程序看起来像现在：

Color Picker App

我的目标是使用户在任何地方触及顶部的颜色光谱和颜色挑选并设置为当前颜色。颜色选择器的代码就像我的视图控制器的代码一样工作。基本上我无法弄清楚如何检索用户通过点击谱图选择的UIColor。更具体地说，我需要从该UIColor中提取红色，绿色和蓝色值。

一旦我有了这些值，我可以从那里拿到它，但我难以理解如何从我的ColorsViewController类的HSBColorPicker类中获取UIColor。

这里是HSBColorPicker类：​​

// 
// HSBColorPicker.swift 
// LED Ring App 
// 
// Created by Blake Fabiani on 9/22/16. 
// Copyright © 2016 Blake Fabiani. All rights reserved. 
// 
import UIKit 

internal protocol HSBColorPickerDelegate : NSObjectProtocol { 
    func HSBColorColorPickerTouched(sender:HSBColorPicker, color:UIColor, point:CGPoint, state:UIGestureRecognizerState) 
} 

@IBDesignable 
class HSBColorPicker : UIView { 

weak internal var delegate: HSBColorPickerDelegate? 
let saturationExponentTop:Float = 2.0 
let saturationExponentBottom:Float = 1.3 

@IBInspectable var elementSize: CGFloat = 1.0 { 
    didSet { 
     setNeedsDisplay() 
    } 
} 

private func initialize() { 
    self.clipsToBounds = true 
    let touchGesture = UILongPressGestureRecognizer(target: self, action: #selector(HSBColorPicker.touchedColor(_:))) 
    touchGesture.minimumPressDuration = 0 
    touchGesture.allowableMovement = CGFloat.greatestFiniteMagnitude 
    self.addGestureRecognizer(touchGesture) 
} 

override init(frame: CGRect) { 
    super.init(frame: frame) 
    initialize() 
} 

required init?(coder aDecoder: NSCoder) { 
    super.init(coder: aDecoder) 
    initialize() 
} 

override func draw(_ rect: CGRect) { 
    let context = UIGraphicsGetCurrentContext() 

    for y in stride(from: 0, to: rect.height, by: elementSize) { 

     var saturation = y < rect.height/2.0 ? CGFloat(2 * y)/rect.height : 2.0 * CGFloat(rect.height - y)/rect.height 
     saturation = CGFloat(powf(Float(saturation), y < rect.height/2.0 ? saturationExponentTop : saturationExponentBottom)) 
     let brightness = y < rect.height/2.0 ? CGFloat(1.0) : 2.0 * CGFloat(rect.height - y)/rect.height 

     for x in stride(from: 0, to: rect.width, by: elementSize) { 
      let hue = x/rect.width 
      let color = UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1.0) 
      context!.setFillColor(color.cgColor) 
      context!.fill(CGRect(x:x, y:y, width:elementSize,height:elementSize)) 
     } 
    } 
} 

func getColorAtPoint(point:CGPoint) -> UIColor { 
    let roundedPoint = CGPoint(x:elementSize * CGFloat(Int(point.x/elementSize)), 
     y:elementSize * CGFloat(Int(point.y/elementSize))) 
    var saturation = roundedPoint.y < self.bounds.height/2.0 ? CGFloat(2 * roundedPoint.y)/self.bounds.height 
     : 2.0 * CGFloat(self.bounds.height - roundedPoint.y)/self.bounds.height 
    saturation = CGFloat(powf(Float(saturation), roundedPoint.y < self.bounds.height/2.0 ? saturationExponentTop : saturationExponentBottom)) 
    let brightness = roundedPoint.y < self.bounds.height/2.0 ? CGFloat(1.0) : 2.0 * CGFloat(self.bounds.height - roundedPoint.y)/self.bounds.height 
    let hue = roundedPoint.x/self.bounds.width 
    return UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1.0) 
} 

func getPointForColor(color:UIColor) -> CGPoint { 
    var hue:CGFloat=0; 
    var saturation:CGFloat=0; 
    var brightness:CGFloat=0; 
    color.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: nil); 

    var yPos:CGFloat = 0 
    let halfHeight = (self.bounds.height/2) 

    if (brightness >= 0.99) { 
     let percentageY = powf(Float(saturation), 1.0/saturationExponentTop) 
     yPos = CGFloat(percentageY) * halfHeight 
    } else { 
     //use brightness to get Y 
     yPos = halfHeight + halfHeight * (1.0 - brightness) 
    } 

    let xPos = hue * self.bounds.width 

    return CGPoint(x: xPos, y: yPos) 
} 

func touchedColor(_ gestureRecognizer: UILongPressGestureRecognizer){ 
    let point = gestureRecognizer.location(in: self) 
    let color = getColorAtPoint(point: point) 

    self.delegate?.HSBColorColorPickerTouched(sender: self, color: color, point: point, state:gestureRecognizer.state)   

} 
} 

这里是ColorsViewController

// 
// ColorsViewController.swift 
// LED Ring App 
// 
// Created by Blake Fabiani on 9/13/16. 
// Copyright © 2016 Blake Fabiani. All rights reserved. 
// 

import UIKit 

var redColor: float_t = 0 
var greenColor: float_t = 0 
var blueColor: float_t = 0 

class ColorsViewController: UIViewController { 

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

@IBOutlet weak var ColorPickerImageView: UIImageView! 

@IBOutlet weak var redColorLabel: UILabel! 
@IBOutlet weak var greenColorLabel: UILabel! 
@IBOutlet weak var blueColorLabel: UILabel! 

@IBOutlet weak var currentColorButton: UIButton! 

@IBAction func redSliderAction(_ sender: UISlider) { 
    changeColors() 
} 
@IBAction func greenSliderAction(_ sender: UISlider) { 
    changeColors() 
} 
@IBAction func blueSliderAction(_ sender: UISlider) { 
    changeColors() 
} 

func chageCurrentColorImage() { 
    currentColorButton.backgroundColor = UIColor(red: CGFloat(redColor/Float(255.0)), green: CGFloat(greenColor/Float(255)), blue: CGFloat(blueColor/Float(255)), alpha: 1.0) 
    changeSliderLabel() 
} 
func changeColors() { 
    redColor = redSlider.value 
    greenColor = greenSlider.value 
    blueColor = blueSlider.value 
    chageCurrentColorImage() 
} 

func changeSliderValue() { 
    redSlider.value = redColor 
    greenSlider.value = greenColor 
    blueSlider.value = blueColor 
} 



func changeSliderLabel() { 
    let roundedRed = String(format: "%0.0f",(redColor)) 
    let roundedGreen = String(format: "%0.0f",(greenColor)) 
    let roundedBlue = String(format: "%0.0f",(blueColor)) 
    redColorLabel.text = "Red: \(roundedRed)" 
    greenColorLabel.text = "Green: \(roundedGreen)" 
    blueColorLabel.text = "Blue: \(roundedBlue)" 

} 

override func viewDidLoad() { 
    super.viewDidLoad() 
    chageCurrentColorImage() 
    changeSliderValue() 
    // Do any additional setup after loading the view, typically from a nib. 
} 

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


} 

非常感谢你的帮助，你可以提供！

Answer 1

使ColorsViewController确认为HSBColorPickerDelegate。并执行该方法并将值存储在ColorsViewController中。此外，我没有看到您在ColorsViewController中使用HSBColorPicker。