Use createGesture to override the default swipe back gesture.
use gesturePriority
> 40 because of the ionic source code
let gesture = createGesture({
el: document.getElementById('myIonPage'),
threshold: 0,
gestureName: 'my-gesture',
gesturePriority: 40.5, // priority of swipe to go back is 40
onMove: ev => console.log(ev)
});
gesture.enable(true);
Use createAnimation ,if you want to customize the animation as well.