Overriding Navigation Behaviour
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Navigation logic in UIKit can be readily customized by subclassing the predefined Behaviour classes and overriding relevant events. UIKit effectively decouples navigation logic and events by distributing them into separate Behaviour classes for each page.
UIKit includes the UIKitBehaviour class, which encompasses all the behavior classes utilized by it. These classes are standard classes that expose navigation events and other events that can be overridden as permitted by UIKit.
This example illustrates how to override the Behaviour class and configure a custom Behaviour class within the UIKit framework.
Our UIKit v4 framework leverages SwiftUI extensively to build pages, components, and elements. These SwiftUI pages are embedded within Apple’s UINavigationController, allowing seamless navigation between screens.
To integrate SwiftUI with UIKit, we provide two hosting controller classes:
AmitySwiftUIHostingController
AmitySwiftUIHostingNavigationController
These classes allow you to wrap SwiftUI views and present them from UIKit-based view controllers.
Navigation Bar Customization
This architecture also offers the flexibility to customize the Navigation Bar beyond what SwiftUI currently supports. To enable these customizations while retaining the native interactive swipe-to-pop gesture, we override gesture handling behavior at a global level on UINavigationController.
Specifically, we override the following methods:
gestureRecognizerShouldBegin(_:_)
gestureRecognizer(_:shouldRecognizeSimultaneouslyWith:)
This ensures that the swipe-to-go-back gesture remains functional even with customizations.
Custom Gesture Behavior
We also provide a class called AmitySwipeToBackGestureBehavior, which gives you control over the swipe-to-pop gesture behavior. You can subclass this and override its functionality as needed.
To apply your custom gesture behavior, assign an instance of your subclass to the swipeToBackGestureBehavior property when initializing your screen or controller within UIKit v4.