yonat/multislider

UISlider clone with multiple thumbs and values, range highlight, optional snap values, optional value labels, either vertical or horizontal.

Features

Multiple thumbs
Range slider (optional) - track color between thumbs different from track color outside thumbs
Vertical (optional)
Value labels (optional)
Snap steps or specific snap values (optional)
Haptic feedback (optional)
Configurable thumb image, minimum and maximum images.
Configurable track width, color, rounding.

Usage

let slider = MultiSlider()
slider.minimumValue = 1    // default is 0.0
slider.maximumValue = 5    // default is 1.0

slider.value = [1, 4.5, 5]

slider.addTarget(self, action: #selector(sliderChanged(_:)), for: .valueChanged) // continuous changes
slider.addTarget(self, action: #selector(sliderDragEnded(_:)), for: . touchUpInside) // sent when drag ends

SwiftUI Usage

@State var valueArray: [CGFloat] = [7, 13]
// ...
MultiValueSlider(value: $valueArray, minimumValue: 1, maximumValue: 5)

The properties mentioned below can be used as modifiers, or passed as arguments to the MultiValueSlider initializer. For example:

MultiValueSlider(value: $valueArray, outerTrackColor: .lightGray)
    .thumbTintColor(.blue)

Getting multiple thumb values

Use value to get all thumbs values, and draggedThumbIndex to find which thumb was last moved.

func sliderChanged(slider: MultiSlider) {
    print("thumb \(slider.draggedThumbIndex) moved")
    print("now thumbs are at \(slider.value)") // e.g., [1.0, 4.5, 5.0]
}

Range slider

slider.outerTrackColor = .lightGray // outside of first and last thumbs

Vertical / horizontal orientation

slider.orientation = .horizontal // default is .vertical
slider.isVertical = false // same effect, but accessible from Interface Builder

Value labels

slider.valueLabelPosition = .left // .notAnAttribute = don't show labels
slider.valueLabelAlternatePosition = true // alternate left and right positions (false by default)
slider.isValueLabelRelative = true // show differences between thumbs instead of absolute values
slider.valueLabelFormatter.positiveSuffix = " 𝞵s"
slider.valueLabelColor = .green
slider.valueLabelFont = someFont

For more control over the label text:

slider.valueLabelTextForThumb = { thumbIndex, thumbValue in
    ["Parasol", "Umbrella"][thumbIndex] + " \(thumbValue)"
}

Snap steps

slider.snapStepSize = 0.5 // default is 0.0, i.e. don't snap
slider.snapValues = [1, 2, 4, 8] // specify specific snap values instead uniform steps
slider.isHapticSnap = false // default is true, i.e. generate haptic feedback when sliding over snap values
slider.snapImage = UIImage(systemName: "circle.fill") // default: no image

Changing Appearance

slider.tintColor = .cyan // color of track
slider.thumbTintColor = .blue // color of thumbs
slider.trackWidth = 32
slider.hasRoundTrackEnds = true
slider.showsThumbImageShadow = false // wide tracks look better without thumb shadow
slider.centerThumbOnTrackEnd = true // when thumb value is minimum or maximum, align it's center with the track end instead of its edge

Images

// add images at the ends of the slider:
slider.minimumImage = UIImage(named: "clown")
slider.maximumImage = UIImage(named: "cloud")

// change image for all thumbs:
slider.thumbImage = UIImage(named: "balloon")

// or let each thumb have a different image:
slider.thumbViews[0].image = UIImage(named: "ball")
slider.thumbViews[1].image = UIImage(named: "club")

// expand drag area when using a small thumb image:
slider.thumbTouchExpansionRadius = 16

Distance/Overlap Between Thumbs

// allow thumbs to overlap:
slider.keepsDistanceBetweenThumbs = false

// make thumbs keep a greater distance from each other (default = half the thumb size):
slider.distanceBetweenThumbs = 3.14

Disabling/freezing thumbs

slider.disabledThumbIndices = [1, 3]

Requirements

iOS 9.0+
Xcode 10

Installation

CocoaPods:

pod 'MultiSlider'

Legacy versions:

Swift Package Manager:

dependencies: [
    .package(url: "https://github.com/yonat/MultiSlider", from: "2.2.1")
]

Package Metadata

Repository: yonat/multislider

Default branch: master

README: README.md