A custom view for animating though initial number and final number

SlidingNumberView

A custom view for animating though initial number and final number with sliding animation.

How it looks

Example Project

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

iOS 10.0+
Swift 4.2+

Installation

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

pod 'SlidingNumberView'

Usage

Import SlidingNumberView in the class you want to use.

import SlidingNumberView

Initialize a SlidingNumberView object with a starting number and a final number as String parameters (Numbers, as of now, are only supported up to 11 Digits). You can also specify a custom font. However, custom fonts can cause undesirable clipping.

var numberView = SlidingNumberView(startNumber: "1234", endNumber: "5678")

\\ or 

var numberView = SlidingNumberView(startNumber: "1234", endNumber: "5678", font: UIFont.systemFont(ofSize: 26))

(Optional) You can specify the total animation duration

numberView.animationDuration = 3

Add to the container view so constraints can be added

self.view.addSubview(numberView)
numberView.translatesAutoresizingMaskIntoConstraints = false

SlidingNumberView has its own weight and height constraint calculated from your font size. So you only need to give its x and y position constraints.

numberView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: 0).isActive = true

numberView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor, constant: 0).isActive = true

Call the object's startCounting method to start animation.

numberView.startCounting(completion: {finish in
	print("Counting Done")
})

The startCounting method has a completion handler so you can change to another endNumber through its properties and start the counting again. (It is crucial to note that the startNumber and endNumber are meant to accept strings of the same digit size).

numberView.startCounting(completion: {finish in
	self.numberView.endNumber = "0000"
	self.numberView.startCounting(completion: { finish in 
		print("Counting Finally done")
	})
})

Full Code Block

numberView = SlidingNumberView(startNumber: "0100", endNumber: "1250", font: UIFont.systemFont(ofSize: 26))
numberView.animationDuration = 3
        
self.view.addSubview(numberView)
numberView.translatesAutoresizingMaskIntoConstraints = false

numberView.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: 0).isActive = true
numberView.centerXAnchor.constraint(equalTo: self.view.centerXAnchor, constant: 0).isActive = true
self.view.layoutIfNeeded()
        
numberView.startCounting(completion: {finish in
	self.numberView.endNumber = "0000"
	self.numberView.startCounting(completion: { finish in 
		print("Counting Finally done")
	})
})

Accessible Properties

/// Spacing of the Digits
numberView.digitSpacing = 10

/// Digit Font
numberView.font = .systemFont(ofSize: 42)

/// The whole animation duration
numberView.animationDuration = 3

/// Boolean. Is it still counting?
numberView.inProgress

Known Limitations

SlidingNumberView is in alpha state.
~~SlidingNumberView can only be initialized programmatically like the usage above.~~ (Can now be set as a custom class for UIView in storyboard.)
~~Only numbers of the same digits can be animated~~ (Increasing-digits will smoothly animate through its change, Decreasing ones are snappy)

To be implemented

[x] Multiple font weights
[x] Support for animating through different digit numbers
[x] Support for initializing through storyboard objects and IBOutlets

Author

bupstan, bupstan.dev@gmail.com