Slider

The MDCSlider object is a Material Design control used to select a value from a continuous range or discrete set of values.

Design & API documentation

Table of contents

• Installation
  • Installation with CocoaPods
  • Importing
• Usage
  • Typical use
  • Stateful APIs
  • Differences from UISlider
• Extensions
  • Color Theming

Installation

Installation with CocoaPods

Add the following to your Podfile:

pod 'MaterialComponents/Slider'

Then, run the following command:

pod install

Importing

To import the component:

Swift

import MaterialComponents.MaterialSlider

Objective-C

#import "MaterialSlider.h"

Usage

Typical use

MDCSlider can be be used like a standard UIControl.

Swift

override func viewDidLoad() {
  super.viewDidLoad()

  let slider = MDCSlider(frame: CGRect(x: 50, y: 50, width: 100, height: 27))
  slider.addTarget(self,
                   action: #selector(didChangeSliderValue(senderSlider:)),
                   for: .valueChanged)
  view.addSubview(slider)
}

func didChangeSliderValue(senderSlider:MDCSlider) {
  print("Did change slider value to: %@", senderSlider.value)
}

Objective C

- (void)viewDidLoad {
  MDCSlider *slider = [[MDCSlider alloc] initWithFrame:CGRectMake(50, 50, 100, 27)];
  [slider addTarget:self
                action:@selector(didChangeSliderValue:)
      forControlEvents:UIControlEventValueChanged];
  [self.view addSubview:slider];
}

- (void)didChangeSliderValue:(MDCSlider *)slider {
  NSLog(@"did change %@ value: %f", NSStringFromClass([slider class]), slider.value);
}

Stateful APIs

MDCSlider exposes stateful APIs to customize the colors for different control states. In order to use this API you must enable statefulAPIEnabled on your MDCSlider instances.

Swift

 let slider = MDCSlider()
 slider.isStatefulAPIEnabled = true

 // Setting a thumb color for selected state.
 slider.setThumbColor(.red, for: .selected)

Objective C

 MDCSlider *slider = [[MDCSlider alloc] init];
 slider.statefulAPIEnabled = YES;
 
 // Setting a thumb color for selected state.
 [slider setThumbColor:[UIColor redColor] forState:UIControlStateSelected];

Differences from UISlider

Does not have api to:

• set right and left icons
• set the thumb image
• set the right and left track images (for a custom track)
• set the right (background track) color

Same features:

• set color for thumb via @c thumbColor
• set color of track via @c trackColor

New features:

• making the slider a snap to discrete values via property numberOfDiscreteValues

Extensions

Color Theming

You can theme a slider with your app's color scheme using the ColorThemer extension.

You must first add the Color Themer extension to your project:

pod 'MaterialComponents/Slider+ColorThemer'

Swift

// Step 1: Import the ColorThemer extension
import MaterialComponents.MaterialSlider_ColorThemer

// Step 2: Create or get a color scheme
let colorScheme = MDCSemanticColorScheme()

// Step 3: Apply the color scheme to your component
MDCSliderColorThemer.applySemanticColorScheme(colorScheme, to: component)

Objective-C

// Step 1: Import the ColorThemer extension
#import "MaterialSlider+ColorThemer.h"

// Step 2: Create or get a color scheme
id<MDCColorScheming> colorScheme = [[MDCSemanticColorScheme alloc] init];

// Step 3: Apply the color scheme to your component
[MDCSliderColorThemer applySemanticColorScheme:colorScheme
     toslider:component];