ForEach trong SwiftUI

1. Với Identifiable


struct Item: Identifiable {
    let id = UUID()
    let name: String
}
 
ForEach(items) { item in
    Text(item.name)
}

2. Với id Parameter


ForEach(["A", "B", "C"], id: \.self) { letter in
    Text(letter)
}
 
ForEach(0..<5) { index in
    Text("Item \(index)")
}

3. Binding in ForEach


struct TodoList: View {
    @State var todos: [Todo]
    
    var body: some View {
        List {
            ForEach($todos) { $todo in
                Toggle(todo.title, isOn: $todo.isComplete)
            }
        }
    }
}

4. Indexed ForEach


ForEach(Array(items.enumerated()), id: \.offset) { index, item in
    Text("\(index + 1). \(item.name)")
}

5. Trong Stacks


VStack {
    ForEach(items) { item in
        ItemRow(item: item)
    }
}
 
HStack {
    ForEach(colors, id: \.self) { color in
        Circle().fill(color).frame(width: 30)
    }
}

6. Grid với ForEach


let columns = [GridItem(.adaptive(minimum: 100))]
 
LazyVGrid(columns: columns) {
    ForEach(photos) { photo in
        Image(photo.name)
            .resizable()
            .aspectRatio(1, contentMode: .fill)
    }
}

📝 Tóm tắt


// Identifiable
ForEach(items) { item in }
 
// Custom id
ForEach(items, id: \.someProperty) { item in }
 
// Range
ForEach(0..<10) { i in }
 
// Binding
ForEach($items) { $item in }