CustomPresenter is an implementation of UIViewControllerAnimatedTransitioning which is a set of methods for implementing the animations for a custom view controller transition (read more here).
This library provides implementation for presentation (CustomControllerPresentationAnimator) and dismissal (CustomControllerDismissAnimator) of view controller. Transition can be customized using presentation context:
protocol CustomControllerPresentationContext {
// Transition properties
var backgroundViewForPresentation: UIView? { get set }
var backgroundAlpha: CGFloat { get }
var duration: TimeInterval { get }
var animationSpringDumping: CGFloat? { get }
var animationInitialSpringVelocity: CGFloat? { get }
// Optional object that controls presentation/dismissal animation
var animationDriver: CustomControllerPresentationAnimationDriver? { get }
// Final frame of presented view controller or initial frame of dismissed one;
// `transitionedView` is presented view during presentation, or dismissed one if we are undergoing dismissal
func controllerFrame(for containerView: UIView, transitionedView: transitionedView) -> CGRect
}To use CustomPresenter with your view controller you need to follow these 3 steps:
- set
modalPresentationStyleto.customfor your view controller - create implementation of
CustomControllerPresentationContextthat will describe transition (don't worry, all properties have default values provided by extension, so little effort is required). - make sure that your view controller is becomes
transitioningDelegateand implement delegate method:
class MyViewController: UIViewController {
private class MyPresentationContext: CustomControllerPresentationContext {}
private var myPresentationContext = MyPresentationContext()
}
extension MyViewController: UIViewControllerTransitioningDelegate {
func animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return CustomControllerPresentationAnimator(presentationContext: myPresentationContext)
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return CustomControllerDismissAnimator(presentationContext: myPresentationContext)
}
}IMPORTANT
Please note that if you are presenting your view controller wrapped in UINavigationController, then you have to make sure that modalPresentationStyle is set to .custom on navigation controller and transitioningDelegate is set to your view controller that implements it as in example above.
iOS 8, Swift 4
CustomPresenter is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'CustomPresenter'Simply add to your Cartfile:
github "azubala/CustomPresenter"
Aleksander Zubala | zubala.com
CustomPresenter is available under the MIT license. See the LICENSE file for more info.