android - Jetpack Compose 添加 onClick 将重新组合

Question

我的代码

@Composable
fun AlbumPage(navHostController: NavHostController) {
   ElevatedButton(onClick = {
      navHostController.popBackStack()
   }) {
      Text(text = "click")
   }

   SideEffect {
        Log.d("tag","1111")
   }
}

当我在 onClick{} 中设置 navHostController.popBackStack() 时，日志显示两次

14:53:34.452 D 1111

14:53:34.816 D 1111

我删除了 navHostController.popBackStack()

@Composable
fun AlbumPage(navHostController: NavHostController) {
   ElevatedButton(onClick = {
      //navHostController.popBackStack()
   }) {
      Text(text = "click")
   }

   SideEffect {
        Log.d("tag","1111")
   }
}

登录一次

为什么？

Answer 1

源文件说明NavHostController.kt

When the given navController
 * changes the back stack due to a [NavController.navigate] or [NavController.popBackStack] this
 * will trigger a recompose and return the top entry on the back stack.
 *
 * @return a mutable state of the current back stack entry