UIViewRepresentable中的UICollectionView不会从onAppear scrollToItem

import SwiftUI

struct MyCollectionView: UIViewRepresentable {
    let data: [String]
    let scrollToIndex: Int
    
    func makeUIView(context: Context) -> UICollectionView {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.dataSource = context.coordinator
        collectionView.delegate = context.coordinator
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        return collectionView
    }
    
    func updateUIView(_ uiView: UICollectionView, context: Context) {
        uiView.reloadData()
        if scrollToIndex < data.count {
            let indexPath = IndexPath(item: scrollToIndex, section: 0)
            uiView.scrollToItem(at: indexPath, at: .centeredVertically, animated: true)
        }
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
        let parent: MyCollectionView
        
        init(_ parent: MyCollectionView) {
            self.parent = parent
        }
        
        func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
            parent.data.count
        }
        
        func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
            cell.backgroundColor = .blue
            return cell
        }
        
        func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
            CGSize(width: 100, height: 100)
        }
    }
}

struct ContentView: View {
    let data = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
    
    var body: some View {
        MyCollectionView(data: data, scrollToIndex: 2)
            .onAppear {
                // 在这里可以执行滚动到指定item的操作
            }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}