SwiftUI:仅当输入不为空时启用保存按钮

import SwiftUI

struct ContentView: View {
    @State private var inputText: String = ""
    
    var body: some View {
        VStack {
            TextField("请输入内容", text: $inputText)
                .padding()
            
            Button(action: {
                // 处理保存逻辑
                saveData()
            }) {
                Text("保存")
                    .foregroundColor(.white)
                    .padding()
                    .background(inputText.isEmpty ? Color.gray : Color.blue)
                    .cornerRadius(10)
            }
            .disabled(inputText.isEmpty)
        }
        .padding()
    }
    
    func saveData() {
        // 在这里处理保存逻辑
        // ...
    }
}

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