KWStepper is a stepper control written in Swift. Unlike UIStepper, KWStepper allows for a fully customized UI and provides callbacks for tailoring the UX.

KWStepper was initially created in Objective-C for Addo Label's Counters• and is now available in Swift for you to enjoy :)

• Allows for a fully customized UI.
• Provides properties for setting different decrement and increment steps.
• Offers optional callbacks for responding to control events and tailoring the UX.

KWStepper is available through CocoaPods. To install it, simply add the following lines to your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '8.0'
use_frameworks!

pod 'KWStepper'

If you prefer not to use a dependency manager, simply copy the Source/KWStepper.swift file into your project.

Try the example project!

var stepper: KWStepper!

@IBOutlet weak var countLabel: UILabel!
@IBOutlet weak var decrementButton: UIButton!
@IBOutlet weak var incrementButton: UIButton!

stepper = KWStepper(
    decrementButton: decrementButton,
    incrementButton: incrementButton)

Respond to control events using the valueChangedCallback property.

stepper.valueChangedCallback = {
    self.countLabel.text = NSString(format: "%.f", self.stepper.value)
}

Or, use the target-action pattern.

stepper.addTarget(self,
    action: "stepperDidChange",
    forControlEvents: .ValueChanged)

func stepperDidChange() {
    countLabel.text = NSString(format: "%.f", stepper.value)
}

With the exception of the continuous property, KWStepper offers everything provided by UIStepper and more.

stepper.autoRepeat = true
stepper.autoRepeatInterval = 0.10
stepper.wraps = true
stepper.minimumValue = 0
stepper.maximumValue = 8
stepper.value = 0
stepper.incrementStepValue = 1
stepper.decrementStepValue = 1

Adopting KWStepperDelegate provides the following optional delegate methods for tailoring the UX.

• optional func KWStepperDidDecrement()
• optional func KWStepperDidIncrement()
• optional func KWStepperMaxValueClamped()
• optional func KWStepperMinValueClamped()

In the example project, KWStepperMaxValueClamped() and KWStepperMinValueClamped() are used to show a UIAlertView when a limit is reached and the wraps property is set to false.

In Counters•, KWStepperDidDecrement() and KWStepperDidIncrement() are used to play different sounds when decrementing and incrementing the steppers.

As an alternative to the KWStepperDelegate protocol, KWStepper provides the following callbacks:

• valueChangedCallback
• decrementCallback
• incrementCallback
• maxValueClampedCallback
• minValueClampedCallback

KWStepper was written by Kyle Weiner.

KWStepper is available under the MIT license. See the LICENSE file for details.