描述：
这是一个非常基本的问题，但我尝试了一些解决方案，但都不起作用。我只想在ViewModel中保存BasicTextField的状态。我尝试了mutableStateOf("SampleText"(，文本出现在BasicTextField中，但不可编辑，甚至键盘也没有出现ViewModel代码：
@HiltViewModel
class NewWorkoutViewModel @Inject constructor(...) : ViewModel() {
var workoutTitle by mutableStateOf("")
...
}
屏幕代码：
@Composable
fun NewWorkoutScreen(
navController: NavController,
viewModel: NewWorkoutViewModel = hiltViewModel()
) {
Scaffold(...) { contentPadding ->
LazyColumn(...) {
item {
FillInContentBox(title = "Title:") {
// TextField which is not working
BasicTextField(textStyle = TextStyle(fontSize = 20.sp),
value = viewModel.workoutTitle,
onValueChange ={viewModel.workoutTitle = it})
}
}
}
}
}
@Composable
fun FillInContentBox(title: String = "", content: @Composable () -> Unit = {}) {
Box(...) {
Column(...) {
Text(text = title)
content()
}
}
}
第二次尝试：
我也尝试过使用状态流，但仍然无法将文本编辑(填充(到TextField中。ViewModel代码：
@HiltViewModel
class NewWorkoutViewModel @Inject constructor(...) : ViewModel() {
private val _workoutTitle = MutableStateFlow("")
var workoutTitle = _workoutTitle.asStateFlow()
fun setWorkoutTitle(workoutTitle: String){
_workoutTitle.value = workoutTitle
}
...
}
屏幕代码：
@Composable
fun NewWorkoutScreen(
navController: NavController,
viewModel: NewWorkoutViewModel = hiltViewModel()
) {
Scaffold(...) { contentPadding ->
LazyColumn(...) {
item {
FillInContentBox(title = "Title:") {
// TextField which is not working
BasicTextField(textStyle = TextStyle(fontSize = 20.sp),
value = viewModel.workoutTitle.collectAsState().value,
onValueChange = viewModel::setWorkoutTitle)
}
}
}
}
}
@Composable
fun FillInContentBox(title: String = "", content: @Composable () -> Unit = {}) {
Box(...) {
Column(...) {
Text(text = title)
content()
}
}
}
您可以这样做：
在可组合中创建变量
var workoutTitle = remember{mutableStateOf("")}
在文本字段中传递变量值：
TextField(
value = workoutTitle.value,
onValueChange = {
/* You can store the value of your text view inside your
view model maybe as livedata object or state anything which suits you
*/
}
)