Slider with ticks & animated Label (Swift)

TGPControls are drop-in replacement of UISlider & UILabel, with visual preview in Interface Builder, single liner instrumentation, smooth animations, simple API, powerful customization.

What's DiscreteSlider?

TGPDiscreteSlider: A slider with discrete steps (i.e. ticks), discrete range, with customizable track, thumb and ticks. Ideal to select individual steps, star rating, integers, rainbow colors, slices and in general any value that is not a continuum. Just set the number of stops, TGPDiscreteSlider handles the selection and the animations for you.

What's CamelLabels?

TGPCamelLabels: A set of animated labels (dock effect) representing a selection. Can be used alone or in conjunction with a UIControl. Ideal to represent steps. The discrete slider and the camel labels can work in unison.

Compatibility

1. Written in Swift 3, can be integrated with Swift or Obj-C
2. TGPControls are AutoLayout, IB Designable and IB Inspectable ready
3. Version 4.0.0 comes with a Swift 3 demo application for iOS 8 and above.
   iOS 7 supported in versions 2.1.0 and earlier

Copyright disclaimer
The above slider is inspired by National Parks by National Geographic iPhone App.
National Parks iPhone App is developed by Rally Interactive LLC.
The above image, styling, appearance and look & feel all Copyright © 2015 National Geographic Society.
TGPControls is not associated with National Geographic Society, Rally Interactive LLC or any of it's subsidiaries.

Fully Customizable

Control everything about the slider or its labels, starting with colors, images and fonts, including track and ticks shape, and thumb shadows. All computations regarding range and sizing and handled automatically. Use the two classes in tandem to create stunning new controls, which can be resized dynamically, to intergrate beautifully into your application.

Most customization can be done in Interface Builder and require zero coding.

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How to integrate (iOS 8 and higher)

Using CocoaPods

platform :ios, '8.0'
use_frameworks!
target 'TGPControlsDemo' do
pod 'TGPControls'
end

Using Carthage

github "SwiftArchitect/TGPControls"

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Besides customization, which you can do entirely under Interface Builder in iOS 8 and later, both TGPDiscreteSlider and TGPCamelLabels require surprisingly little code to integrate.

DiscreteSlider

For simplicity, TGPDiscreteSlider does not descend from UISlider but from UIControl. It uses a minimumValue, a tickCount and an incrementValue (instead of minimumValue and maximumValue). All graphic aspects, such as physical spacing of the ticks or physical width of the track are controlled internally. This makes TGPDiscreteSlider predictable. it is guaranteed to always fit snuggly inside its bounds.

Single step: To use DiscreteSlider + CamelLabels in tandem, you need exactly 1 line of code:

discreteSlider.ticksListener = camelLabels

That's all!
Through the TGPControlsTicksProtocol, the camelLabels listen to value and size changes. You may want to adopt this protocol to handle changes, or use the traditional UIControl notifications:

Advanced Steps (1a): register to notifications (just like any UIControl)

discreteSlider.addTarget(self,
action: #selector(valueChanged(_:event:)),
for: .valueChanged)

Advanced Steps (1b): respond to notification

func valueChanged(_ sender: TGPDiscreteSlider, event:UIEvent) {
self.stepper.value = Double(sender.value)
}

tickStyle, trackStyle, thumbStyle Properties:

Constant	Value
.iOS	0	Gives to any component the iOS appearance: Ticks are invisible, track is blue and gray, thumb is round with a shadow
.rectangular	1	Boxy look with hard edges
.rounded	2	From rounded rectangles to perfects circles, depending on vertical to horizontal ratio
.invisible	3	Surprisingly useful to individually hide ticks, track, or even thumb

Other Properties:

Listener
ticksListener	a TGPControlsTicksProtocol listener, such as TGPCamelLabels, which receives spacing changes notifications.
allTargets	Inherited from UIControl, receives actions for control event

Tick
tickSize	absolute dimension
tickImage	a UIImage, fits in tickSize (†)
tickCount	discrete steps, must be 2 or greater
ticksDistance	horizontal spacing (calculated)

Track
trackThickness	height
trackImage	a UIImage, ignores trackThickness (†)
minimumTrackTintColor	track lower side
maximumTrackTintColor	track higher side

Thumb
thumbSize	absolute size
thumbImage	aUIImage, dictates thumbSize (†)
thumbTintColor	background
thumbShadowRadius	breaking the flat design concept
thumbShadowOffset	applied to thumbShadowRadius, may affect control bounds

(†) Introduced in version 4.0.0. Former versions used a resource name as a string.

CamelLabels

Besides font customization, TGPCamelLabels only requires a set of labels (supplied as strings), and an active index selection.

Step 1: tell the TGPCamelLabels what to select (Refer to Single step section above to use DiscreteSlider + CamelLabels in tandem)

camelLabels.value = sender.value

There is no step 2. Most of the customization can be done inside Interface Builder.

Properties:

Property
ticksListener	ties a discrete slider to its camel labels. This is your most robust method to not only ensure that the layout of both controls match exactly, but also adjust this spacing when orientation changes. A typical use may be discreteSlider.ticksListener = camelLabels
names	supplies a new set of labels ; supersedes the tickCount property, which will return the number of labels. A typical use may be camelLabels.names = ["OFF", "ON"]
ticksDistance	override the labels spacing entirely ; prefer the ticksListener mechanism if it is available to you. A typical use may be camelLabels.ticksDistance = 15
value	which label is emphasized (selected)
backgroundColor	labels become tap-through (click-through) when set to UIColor.clear ; use TGPCamelLabels on top of other UI elements, even native iOS objects!(*)

(*) You can tap on the UISwitch laid out either under or below the camel labels:

Edges & Animation
offCenter	leftmost and righmost labels only: relative inset expressed as a proportion of individual label width: 0: none, +0.5: nudge in by a half width (fully fit) or -0.5: draw completely outside
insets	leftmost and righmost labels only: absolute inset expressed in pixels
emphasisLayout	emphasized (selected) labels vertical alignment ; .top, .centerY or .bottom. Default is .top (‡)
regularLayout	regular labels vertical alignment ; .top, .centerY or .bottom. Default is .bottom (‡)

(‡) No camel animation will occur when emphasisLayout = regularLayout, i.e. .centerY.

Emphasized labels
upFontName	font
upFontSize	size
upFontColor	color

Regular labels
dnFontName	font
dnFontSize	size
dnFontColor	color

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Code example (Swift 3)

See TGPControlsDemo project: TGPControlsDemo (Modern Swift syntax + IBInspectable)

Running the demo using Carthage

1. cd TGPControlsDemo
2. carthage update
3. open TGPControlsDemo.xcodeproj
4. Select scheme TGPControlsDemo Cart
5. Build & run

Running the demo using Cocoapods

1. cd TGPControlsDemo
2. pod install
3. open TGPControlsDemo.xcworkspace
4. Select scheme TGPControlsDemo Pods
5. Build & run

import UIKit
import TGPControls

class ViewController: UIViewController {
@IBOutlet weak var oneTo10Labels: TGPCamelLabels!
@IBOutlet weak var oneTo10Slider: TGPDiscreteSlider!
@IBOutlet weak var alphabetLabels: TGPCamelLabels!
@IBOutlet weak var alphabetSlider: TGPDiscreteSlider!
@IBOutlet weak var switch1Camel: TGPCamelLabels!

override func viewDidLoad() {
super.viewDidLoad()

alphabetLabels.names = [
"A","B","C","D","E","F","G","H","I","J","K","L","M",
"N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]
switch1Camel.names = ["OFF", "ON"]

// Automatically track tick spacing and value changes
alphabetSlider.ticksListener = alphabetLabels
oneTo10Slider.ticksListener = oneTo10Labels
}

// MARK: - UISwitch
@IBAction func switch1ValueChanged(_ sender: UISwitch) {
switch1Camel.value = (sender.isOn) ? 1 : 0
}
}

Customization examples