我正在尝试在我的应用程序中实现HSBColorPicker类。到目前为止，我已经可以像我想要的那样编译和运行所有东西，但是我遇到的问题是试图从HSBColorPicker类获取颜色信息，并在其他类中使用它。这是我的应用目前的样子：
Color Picker App
我的目标是用户触摸顶部色谱上的任何位置，然后选择该颜色并将其设置为当前颜色。颜色选择器的代码和我的视图控制器的代码一样有效。基本上，我无法弄清楚的是如何通过点击光谱来检索用户选择的UIColor。更具体地说，我需要从该UIColor中提取Red，Green和Blue值。
一旦有了这些值，就可以从那里获取它，但是我对如何从ColorsViewController类的HSBColorPicker类获取UIColor感到困惑。
这是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()
}
}
最佳答案
使ColorsViewController确认至HSBColorPickerDelegate。并实现该方法并将值存储在ColorsViewController中。另外，我看不到您在HSBColorPicker中使用ColorsViewController。
关于ios - 从另一个类委托(delegate)检索UIColor，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39670195/