🔹.onDelete

when elements in the ForEach view are deleted

SwiftUI ⟩ view ⟩ groupings ⟩ ForEach ⟩ .onDelete

Tell SwiftUI what to do when elements in the ForEach view are deleted.

// list data from environment object
// (assume `data` is the environment object)
ForEach(data.creatures) { creature in 
    CreatureRow(creature: creature)
}
// ⭐️ when elements in the ForEach view are deleted
.onDelete { indexSet in 

    /// • SwiftUI passes a set of indices to the closure 
    ///   that’s relative to the dynamic view’s underlying collection of data.
    
    // ⭐️ delete corresponding items from the underlying collection of data
    data.creatures.remove(atOffsets: indexSet)
}

👥 相關

• view ⟩ state ⟩ delete item from list

• add item to list

📘 手冊