my code
@Composable
fun AlbumPage(navHostController: NavHostController) {
ElevatedButton(onClick = {
navHostController.popBackStack()
}) {
Text(text = "click")
}
SideEffect {
Log.d("tag","1111")
}
}
when i set navHostController.popBackStack() in onClick{},log show twice
14:53:34.452 D 1111
14:53:34.816 D 1111
I remove navHostController.popBackStack()
@Composable
fun AlbumPage(navHostController: NavHostController) {
ElevatedButton(onClick = {
//navHostController.popBackStack()
}) {
Text(text = "click")
}
SideEffect {
Log.d("tag","1111")
}
}
log once
why?
CodePudding user response:
Description of the source file 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