## Picker wheel ticks

- Use case: A custom wheel or scrubber that ticks once per row as it spins past values.
- Feel: The classic clock-picker feel: light, dry ticks in rhythm with the scroll.
- APIs: UISelectionFeedbackGenerator, .sensoryFeedback(.selection)
- Minimum OS: iOS 10+

### SwiftUI (iOS 17+)

```swift
import SwiftUI

struct MinutePicker: View {
    @State private var minutes = 5

    var body: some View {
        Picker("Minutes", selection: $minutes) {
            ForEach(0..<60, id: \.self) { Text("\($0) min") }
        }
        .pickerStyle(.wheel)
        // System wheels tick on-device already; this pattern is for
        // custom scrubbers bound to any changing value:
        .sensoryFeedback(.selection, trigger: minutes)
    }
}
```

### UIKit (custom scrubber)

```swift
final class Scrubber: UIScrollView, UIScrollViewDelegate {
    private let tick = UISelectionFeedbackGenerator()
    private var lastIndex = 0
    private let rowHeight: CGFloat = 36

    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        let index = Int(round(scrollView.contentOffset.y / rowHeight))
        if index != lastIndex {
            lastIndex = index
            tick.selectionChanged()
            tick.prepare() // stay armed for fast flicks
        }
    }
}
```

### Notes
- Selection feedback is intentionally the lightest haptic — repeated dozens of times it must never fatigue.