代码在 lambda 表达式之外工作，但不能在内部工作

Question

我有以下代码：

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    fab_action.setOnClickListener(actionSetMyLocationEnable) //passing my lambda
}

private val actionSetMyLocationEnable: (View) -> Unit = { it as FloatingActionButton
    it.isSelected = !it.isSelected
    setMyLocationEnable(it.isSelected) //this call work fine
}

private fun setMyLocationEnable(enable: Boolean) {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
                PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
        return //and this return work nice too
    }
    mMap.isMyLocationEnabled = enable
}

但是，当我按如下方式应用它时：

private val actionSetMyLocationEnable: (View) -> Unit = { it as FloatingActionButton
    it.isSelected = !it.isSelected
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
                PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
        return //error 1
    }
    mMap.isMyLocationEnabled = it.isSelected //error 2
}

我正面临这两个错误：

错误 1.

这里不允许'return'

错误 2。

调用需要权限，可能会被用户拒绝：代码应该 明确检查权限是否可用（使用 checkPermission) 或显式处理潜在的 SecurityException

我知道每个错误的含义，但是

我的问题是：为什么我的代码在 lambda 表达式之外可以工作，而在里面却不能工作？我该如何解决这个问题？

更新

@Rene Ferrari's solution 解决了错误1。非常感谢@Rene Ferrari

Answer 1

根据 mTak 的回答，我的解决方案如下：

private val actionSetMyLocationEnable: (View) -> Unit = returnHere@{ it as FloatingActionButton
    it.isSelected = !it.isSelected
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
                PERMISSION_REQUEST_ACCESS_FINE_LOCATION)
        return@returnHere //error 1
    }
    mMap.isMyLocationEnabled = it.isSelected //error 2
}

您基本上可以定义要返回的标签。这个标签当然可以命名为除关键字之外的任何东西。在此示例中，我将其命名为 returnHere