從另一個類Delaware獲取UIColor

Question

我想在我的應用程序中實現類HSBColorPicker。我有一切編譯和運行，就像我想要的那樣，但是我卡住的地方是試圖從HSBColorPicker類獲取顏色信息，並在我的其他類中使用它。這裏是我的應用程序看起來像現在：

Color Picker App

我的目標是使用戶在任何地方觸及頂部的顏色光譜和顏色挑選並設置爲當前顏色。顏色選擇器的代碼就像我的視圖控制器的代碼一樣工作。基本上我無法弄清楚如何檢索用戶通過點擊譜圖選擇的UIColor。更具體地說，我需要從該UIColor中提取紅色，綠色和藍色值。

一旦我有了這些值，我可以從那裏拿到它，但我難以理解如何從我的ColorsViewController類的HSBColorPicker類中獲取UIColor。

這裏是HSBColorPicker類：​​

// 
// 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)   

} 
} 

這裏是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. 
} 


} 

非常感謝你的幫助，你可以提供！

Answer 1

使ColorsViewController確認爲HSBColorPickerDelegate。並執行該方法並將值存儲在ColorsViewController中。此外，我沒有看到您在ColorsViewController中使用HSBColorPicker。