Get Index on UIslider - ios

Question

I have radar chart with data.I want to give index for slider Based on data count.If i am moving slider the graph value should move.If suppose i am at bellow of middle value slider thumb should go to near index.
for _ in 0..<3 {
let mind = arc4random_uniform(mult) + min
let bre = arc4random_uniform(mult) + min
let rel = arc4random_uniform(mult) + min
dataPoints.append(GraphDataPoints(mindfulness: Double(mind), breathing: Double(bre), relaxation: Double(rel)))
}
self.setChartData(mindfulness: dataPoints[0].mindfulness, breathing: dataPoints[0].breathing, relaxation: dataPoints[0].relaxation)
numberofPointsOnSlider = Float(100 / (dataPoints.count - 1))
numberofPointsOnSlider is percent to move.In lastSliderValue i am storing the slider value.pointIndex have index.
#objc func sliderTouchEvents(slider:UISlider,event: UIEvent){
slider.isContinuous = true
if let touchEvent = event.allTouches?.first{
switch touchEvent.phase{
case .began:
lastSliderValue = slider.value
break
case .moved:
if slider.value.truncatingRemainder(dividingBy: numberofPointsOnSlider) == 0{
if lastSliderValue < slider.value || lastSliderValue > slider.value{
pointIndex = Int(slider.value / numberofPointsOnSlider)
self.isIncrement = false
}
lastSliderValue = slider.value
}
if !animation {
if pointIndex >= 0 && pointIndex < dataPoints.count {
var percentToMove:Float = 0
if lastSliderValue > slider.value && pointIndex > 0 {
percentToMove = (100 * (numberofPointsOnSlider - (slider.value.truncatingRemainder(dividingBy: numberofPointsOnSlider) ))) / numberofPointsOnSlider
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - dataPoints[pointIndex - 1].mindfulness)
relaxationDiff = Float(dataPoints[pointIndex].relaxation - dataPoints[pointIndex - 1].relaxation)
breathingDiff = Float(dataPoints[pointIndex].breathing - dataPoints[pointIndex - 1].breathing)
}else if lastSliderValue < slider.value && pointIndex < dataPoints.count - 1 {
percentToMove = (100 * (slider.value.truncatingRemainder(dividingBy: numberofPointsOnSlider) )) / numberofPointsOnSlider
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - dataPoints[pointIndex + 1].mindfulness)
relaxationDiff = Float(dataPoints[pointIndex].relaxation - dataPoints[pointIndex + 1].relaxation)
breathingDiff = Float(dataPoints[pointIndex].breathing - dataPoints[pointIndex + 1].breathing)
}
mp = Float(dataPoints[pointIndex].mindfulness) - (mindfulDiff / 100 ) * percentToMove
rp = Float(dataPoints[pointIndex].relaxation) - (relaxationDiff / 100 ) * percentToMove
bp = Float(dataPoints[pointIndex].breathing) - (breathingDiff / 100) * percentToMove
UIView.animate(withDuration: 10, animations: {
self.setChartData(mindfulness: Double(self.mp) , breathing: Double(self.bp) , relaxation: Double(self.rp) )
})
}
else {
if (pointIndex < 0) {
pointIndex = 0
}
}
}
break
case .ended:
let progDiff = lastSliderValue - slider.value
print("End movie, \(pointIndex) , \(slider.value) ,progDiff: \(progDiff)")
if progDiff < 0{
if (progDiff * -1) >= numberofPointsOnSlider / 2 {
animation = true
UIView.animate(withDuration: 10, animations: {
slider.value += self.numberofPointsOnSlider + progDiff
})
pointIndex = Int(slider.value / numberofPointsOnSlider)+1
// if isIncrement {
// pointIndex += pointIndex
// }else {
// isIncrement = true
//
// }
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - Double(mp))
relaxationDiff = Float(dataPoints[pointIndex].relaxation - Double(rp))
breathingDiff = Float(dataPoints[pointIndex].breathing - Double(bp))
doGraphAnimate()
}else {
animation = true
UIView.animate(withDuration: 10, animations: {
slider.value = self.lastSliderValue
})
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - Double(mp))
relaxationDiff = Float(dataPoints[pointIndex].relaxation - Double(rp))
breathingDiff = Float(dataPoints[pointIndex].breathing - Double(bp))
doGraphAnimate()
}
}else if progDiff > 0{
if progDiff >= numberofPointsOnSlider / 2 {
animation = true
// if isIncrement {
// print("pointIndex : \(pointIndex)")
// pointIndex += pointIndex
// print("pointIndex Incremented : \(pointIndex)")
// }else{
// isIncrement = true
// }
pointIndex = Int(slider.value / numberofPointsOnSlider)
UIView.animate(withDuration: 10, animations: {
slider.value -= self.numberofPointsOnSlider - (self.lastSliderValue - slider.value)
})
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - Double(mp))
relaxationDiff = Float(dataPoints[pointIndex].relaxation - Double(rp))
breathingDiff = Float(dataPoints[pointIndex].breathing - Double(bp))
doGraphAnimate()
}
else {
animation = true
UIView.animate(withDuration: 10, animations: {
slider.value = self.lastSliderValue
})
mindfulDiff = Float(dataPoints[pointIndex].mindfulness - Double(mp))
relaxationDiff = Float(dataPoints[pointIndex].relaxation - Double(rp))
breathingDiff = Float(dataPoints[pointIndex].breathing - Double(bp))
doGraphAnimate()
}
}
default :
break
}
}
}
Help me, Thankyou .

Answer 1

DO you mean you want slider to move only at certain discrete positions when you move it ? But your spec is not totally clear.
If so, this is how I, so that if slider moves from 0 to 14 it will show 14, from 15 to 85, it will show 85. I let you adapt to get the exact working you want.
I use this IBAction for the slider
#IBAction fileprivate func changeRowSlider(_ sender: NSSlider) {
let movedPosition = Int(sender.doubleValue)
if movedPosition == 0 {
sender.integerValue = 0
return
}
if movedPosition <= 14 {
sender.integerValue = 14
return
}
if movedPosition <= 85 {
sender.integerValue = 85
return
}
sender.integerValue = 100 // last case: move to maxValue
}