Combines a sequence of values by modifying the previously-accumulated value with the result of a closure that provides the next value.
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
- Xcode 11.0+
The value accumulated through previous calls to this method. The implementation should modify this value.
A closure that returns the next value in the sequence.
This method receives its values in view-tree order.