如何在单独的函数中访问@State变量

import SwiftUI

struct ContentView: View {
    @State private var count = 0
    
    var body: some View {
        VStack {
            Text("Count: \(count)")
            
            Button(action: {
                self.incrementCount()
            }) {
                Text("Increment")
            }
        }
    }
    
    func incrementCount() {
        count += 1
        // 在这个函数中访问和修改@State变量count
    }
}