Gestures

Gestures

The simple cases are .onTapGesture and .onLongPressGesture. For anything more, create a gesture value — DragGesture, MagnifyGesture, RotateGesture, LongPressGesture — and attach it with .gesture(). A gesture reports values through .onChanged and .onEnded. @GestureState holds a value that resets itself automatically when the gesture ends, which makes it ideal for a temporary drag offset. You combine gestures with .simultaneously(with:), .sequenced(before:) and .exclusively(before:).

One detail catches everyone: the area of a view that responds to touches is its visible content. Add .contentShape(Rectangle()) to make the whole frame respond.

Make a card you can drag. When released it springs back to where it started — unless it was dragged past a threshold, in which case it is dismissed.

1. What is the difference between @GestureState and @State for tracking a drag?
2. How do you require a long press before a drag can begin?
3. Why might taps on the empty part of a row not register, and how do you fix it?

• Gestures
• DragGesture
• Input events