Swiftui Guideline: Forms — Use @FocusState for keyboard. Description: Manage keyboard focus. Do: @FocusState for text field focus. Don't: Manual first responder handling. Good Example: @FocusState private var isFocused: Bool. Bad Example: UIKit first responder. Severity: Medium. Docs: https://developer.apple.com/documentation/swiftui/focusstate.