BubbleTransition
  • December 3, 2023

A custom modal transition that presents and dismiss a controller inside an expanding and shrinking bubble.

Screenshot


Usage


Install through CocoaPods:

pod ‘BubbleTransition’, ‘~> 3.2.0’

use_frameworks!

Install through Carthage:

github “andreamazz/BubbleTransition”

Install through Swift Package Manager:

To integrate using Xcode:

File -> Swift Packages -> Add Package Dependency...

Enter package URL: https://github.com/andreamazz/BubbleTransition, and select the latest release.

Setup


Have your view controller conform to UIViewControllerTransitioningDelegate. Set the transitionMode, the startingPoint, the bubbleColor and the duration.

let transition = BubbleTransition()

public override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let controller = segue.destination
controller.transitioningDelegate = self
controller.modalPresentationCapturesStatusBarAppearance = true
controller.modalPresentationStyle = .custom
}

// MARK: UIViewControllerTransitioningDelegate

public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.transitionMode = .present
transition.startingPoint = someButton.center
transition.bubbleColor = someButton.backgroundColor!
return transition
}

public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
transition.transitionMode = .dismiss
transition.startingPoint = someButton.center
transition.bubbleColor = someButton.backgroundColor!
return transition
}

You can find the Objective-C equivalent here.

Swipe to dismiss


You can use an interactive gesture to dismiss the presented controller. To enable this gesture, prepare the interactive transition:

let interactiveTransition = BubbleInteractiveTransition()

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let controller = segue.destination as? ModalViewController {
controller.transitioningDelegate = self
controller.modalPresentationStyle = .custom
controller.modalPresentationCapturesStatusBarAppearance = true
controller.interactiveTransition = interactiveTransition
interactiveTransition.attach(to: controller)
}
}

and implement interactionControllerForDismissal in your presenting controller:

func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
return interactiveTransition
}

In the presented controller make sure to call finish() on the interactive gesture if you need to quickly dismiss from a button press instead. Check the sample code for more info.

You can decide the gesture threshold and the swipe direction:

interactiveTransition.interactionThreshold = 0.5
interactionThreshold.swipeDirection = .up

Properties


var startingPoint = CGPointZero

The point that originates the bubble.

var duration = 0.5

The transition duration.

var transitionMode: BubbleTranisionMode = .present

The transition direction. Either .present.dismiss or .pop.

var bubbleColor: UIColor = .white

The color of the bubble. Make sure that it matches the destination controller’s background color.

Checkout the sample project for the full implementation.

GitHub


View Github

#carthage #cocoapods #ios #swift #transition #xcode
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