如果您支持(iOS 15.0, macOS 12.0, tvOS 15.0, watchOS 8.0, *)，则TimelineView允许您使用context.date创建动画。

struct PulsingTextView: View {
    let colors = [Color.orange, Color.yellow, Color.red]
    @State private var colorIndex = 0
    let duration: TimeInterval = 2.0
    var body: some View {
        TimelineView(.periodic(from: .now, by: duration)) { context in
            Text("Hello World!")
            //Use the date to change the colors
                .foregroundColor(colors[Int(context.date.timeIntervalSince1970) % colors.count])
                .animation(.easeInOut(duration: duration))
                .font(.custom("HelveticaNeue-Bold", size: 32))
        }
    }
}

否则，您可以使用以下内容重新创建逻辑

struct PulsingTextView: View {
    let colors = [Color.orange, Color.yellow, Color.red]
    let duration: TimeInterval = 1
    @State private var index: Int = 0
    var body: some View {
        Text("Hello World!")
            .foregroundColor(colors[index % colors.count])
            .font(.custom("HelveticaNeue-Bold", size: 32))
            .task {
                for n in 0...Int.max{
                    withAnimation(.easeInOut(duration: duration)){
                        index = n
                    }
                    try? await Task.sleep(for: .seconds(duration))
                }
            }
    }
    
}