在ForEach完成时执行代码- swiftUI

import SwiftUI

struct ContentView: View {
    @State private var isForEachCompleted = false
    let items = [1, 2, 3, 4, 5]

    var body: some View {
        VStack {
            ForEach(items.indices, id: \.self) { index in
                Text("Item \(items[index])")
                    .onAppear {
                        if index == items.count - 1 {
                            isForEachCompleted = true
                        }
                    }
            }
        }
        .onChange(of: isForEachCompleted) { _ in
            if isForEachCompleted {
                print("ForEach completed")
                // 在这里执行你的代码
            }
        }
    }
}

import SwiftUI

struct ContentView: View {
    let items = [1, 2, 3, 4, 5]

    var body: some View {
        GeometryReader { geometry in
            VStack {
                ForEach(items.indices, id: \.self) { index in
                    Text("Item \(items[index])")
                        .frame(maxWidth: .infinity)
                        .background(Color.green)
                }
            }
            .background(Color.blue)
            .onAppear {
                if geometry.size.height > 0 {
                    print("ForEach completed")
                    // 在这里执行你的代码
                }
            }
        }
    }
}

import SwiftUI

struct ContentView: View {
    let items = [1, 2, 3, 4, 5]

    var body: some View {
        VStack {
            ForEach(items.indices, id: \.self) { index in
                Text("Item \(items[index])")
                    .background(Color.green)
                    .preference(key: ForEachCompletionPreferenceKey.self, value: index == items.count - 1)
            }
        }
        .background(Color.blue)
        .onPreferenceChange(ForEachCompletionPreferenceKey.self) { isCompleted in
            if isCompleted {
                print("ForEach completed")
                // 在这里执行你的代码
            }
        }
    }
}

struct ForEachCompletionPreferenceKey: PreferenceKey {
    static var defaultValue: Bool = false

    static func reduce(value: inout Bool, nextValue: () -> Bool) {
        value = nextValue()
    }
}