简单的快速选择器popover(iOS)

这是我所做的一样简单.它只是一个轻量级的UIView,允许您指定元素大小,以防您想要阻止区域(elementSize> 1).它将自身绘制在界面构建器中,以便您可以设置元素大小并查看后果.只需将界面构建器中的一个视图设置为此类,然后将自己设置为委托.有人会在某人点击或拖动它,并在那个位置使用uicolor来告诉你.它将自己画成自己的界限,除了这个课外,没有任何需要,没有形象.

元素大小= 1(默认)

元素大小= 10

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.max
        self.addGestureRecognizer(touchGesture)
    }

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

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

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

        for y in (0 as CGFloat).stride(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 (0 as CGFloat).stride(to: rect.width,by: elementSize) {
                let hue = x / rect.width
                let color = UIColor(hue: hue,saturation: saturation,brightness: brightness,alpha: 1.0)
                CGContextSetFillColorWithColor(context,color.CGColor)
                CGContextFillRect(context,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,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.locationInView(self)
        let color = getColorAtPoint(point)

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