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Add haptic feedback when snapping to center #16

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Add haptic feedback when snapping to center #16

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f76f186
Add haptic feedback when snapping to center
Jan 16, 2017
96bfd71
Only trigger haptic once when snapping to center
Jan 16, 2017
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31 changes: 24 additions & 7 deletions Source/ColorWheel.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,16 @@ class ColorWheel: UIView {
var indicatorCircleRadius: CGFloat = 12.0
var indicatorColor: CGColor = UIColor.lightGray.cgColor
var indicatorBorderWidth: CGFloat = 2.0
var isAtCenter = true

// Retina scaling factor
let scale: CGFloat = UIScreen.main.scale

@available(iOS 10.0, iOSApplicationExtension 10.0, *)
lazy var hapticSelectionGenerator: UISelectionFeedbackGenerator! = {
return UISelectionFeedbackGenerator()
}()

weak var delegate: ColorWheelDelegate?

required init?(coder aDecoder: NSCoder) {
Expand Down Expand Up @@ -83,10 +89,9 @@ class ColorWheel: UIView {
point = touch.location(in: self)
}

let indicator = getIndicatorCoordinate(point)
point = indicator.point
updateIndicatorCoordinate(point)
var color = (hue: CGFloat(0), saturation: CGFloat(0))
if !indicator.isCenter {
if !isAtCenter {
color = hueSaturationAtPoint(CGPoint(x: point.x*scale, y: point.y*scale))
}

Expand All @@ -108,7 +113,7 @@ class ColorWheel: UIView {
}
}

func getIndicatorCoordinate(_ coord: CGPoint) -> (point: CGPoint, isCenter: Bool) {
func updateIndicatorCoordinate(_ coord: CGPoint) {
// Making sure that the indicator can't get outside the Hue and Saturation wheel

let dimension: CGFloat = min(wheelLayer.frame.width, wheelLayer.frame.height)
Expand All @@ -129,13 +134,25 @@ class ColorWheel: UIView {

// If the touch coordinate is close to center, focus it to the very center at set the color to white
let whiteThreshold: CGFloat = 10
var isCenter = false
if (distance < whiteThreshold) {
outputCoord.x = wheelLayerCenter.x
outputCoord.y = wheelLayerCenter.y
isCenter = true

if !isAtCenter {
if #available(iOS 10.0, iOSApplicationExtension 10.0, *) {
hapticSelectionGenerator.selectionChanged()
}
}

isAtCenter = true
} else {
isAtCenter = false

if #available(iOS 10.0, iOSApplicationExtension 10.0, *) {
hapticSelectionGenerator.prepare()
}
}
return (outputCoord, isCenter)
point = outputCoord
}

func createColorWheel(_ size: CGSize) -> CGImage {
Expand Down