how to pass suspend function as parameter to another function? Kotlin Coroutines

问题

I want to send suspending function as a parameter, but it shows " Modifier 'suspend' is not applicable to 'value parameter" . how to do it?

fun MyModel.onBG(suspend bar: () -> Unit) {
  launch {
    withContext(Dispatchers.IO) {
        bar()
    }

  }
}

回答1:

Lambda's suspend modifier should be placed after the colon character, not in front. Example:

fun MyModel.onBG(bar: suspend () -> Unit) {
  launch {
    withContext(Dispatchers.IO) {
      bar()
    }
  }
}

来源：https://stackoverflow.com/questions/55886676/how-to-pass-suspend-function-as-parameter-to-another-function-kotlin-coroutines