What you observe is that your gesture is being cancelled. From Adding Interactivity with Gestures - Apple Developer article:
SwiftUI only invokes the onEnded(_:) callback when the gesture succeeds.
This is what works for me:
struct DragGestureViewModifier: ViewModifier {
@GestureState private var isDragging: Bool = false
@State var gestureState: GestureStatus = .idle
var onStart: Callback?
var onUpdate: ((DragGesture.Value) -> Void)?
var onEnd: Callback?
var onCancel: Callback?
func body(content: Content) -> some View {
content
.gesture(
DragGesture()
.updating($isDragging) { _, isDragging, _ in
isDragging = true
}
.onChanged(onDragChange(_:))
.onEnded(onDragEnded(_:))
)
.onChange(of: gestureState) { state in
guard state == .started else { return }
gestureState = .active
}
.onChange(of: isDragging) { value in
if value, gestureState != .started {
gestureState = .started
onStart?()
} else if !value, gestureState != .ended {
gestureState = .cancelled
onCancel?()
}
}
}
func onDragChange(_ value: DragGesture.Value) {
guard gestureState == .started || gestureState == .active else { return }
onUpdate?(value)
}
func onDragEnded(_ value: DragGesture.Value) {
gestureState = .ended
onEnd?()
}
enum GestureStatus: Equatable {
case idle
case started
case active
case ended
case cancelled
}
}
fiser333
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