KMM iOS端使用PopupPositionProvider遇编译错误：IrClassSymbolImpl未绑定

错误信息 #

error: java.lang.IllegalStateException: IrClassSymbolImpl is unbound. Signature: null
at org.jetbrains.kotlin.ir.symbols.impl.IrBindableSymbolBase.getOwner(IrPrivateSymbolBase.kt)

问题场景 #

在Kotlin多平台项目中，尝试通过@Composable函数直接返回匿名PopupPositionProvider实现时，iOS应用出现编译期错误，代码如下：

@Composable
private fun rememberPopupPos(
    side: PopupSide,
    onAnchorPos: (pos: IntOffset) -> Unit
) = object : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize
    ): IntOffset {
        val popupRect = placePopup(
            rect = popupContentSize.toIntRect(),
            anchor = anchorBounds.inflate(anchorBounds.minDimension / 10),
            side = side,
            dir = layoutDirection
        ).constrainOffset(windowSize.toIntRect())
        onAnchorPos(anchorBounds.center - popupRect.topLeft)
        return popupRect.topLeft
    }
}

解决方法 #

1. 抽离匿名类为独立实现类 #

Kotlin/Native的IR编译器对Composable上下文中的匿名类支持存在限制，将PopupPositionProvider的实现抽成独立类即可解决：

首先定义独立的实现类：

class CustomPopupPositionProvider(
    private val side: PopupSide,
    private val onAnchorPos: (IntOffset) -> Unit
) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize
    ): IntOffset {
        val popupRect = placePopup(
            rect = popupContentSize.toIntRect(),
            anchor = anchorBounds.inflate(anchorBounds.minDimension / 10),
            side = side,
            dir = layoutDirection
        ).constrainOffset(windowSize.toIntRect())
        onAnchorPos(anchorBounds.center - popupRect.topLeft)
        return popupRect.topLeft
    }
}

然后在Composable函数中通过remember创建实例：

@Composable
private fun rememberPopupPos(
    side: PopupSide,
    onAnchorPos: (IntOffset) -> Unit
): PopupPositionProvider {
    return remember(side, onAnchorPos) {
        CustomPopupPositionProvider(side, onAnchorPos)
    }
}

2. 检查版本兼容性 #

该错误常出现在Kotlin版本与Compose Multiplatform版本不匹配的场景，需确保两者版本对应（例如Kotlin 1.9.20对应Compose Multiplatform 1.5.1），调整至官方适配的版本组合。

3. 清理构建缓存 #

执行以下命令清理缓存后重新构建，排除缓存导致的IR绑定异常：

./gradlew clean

iOS端可同时在Xcode中执行Product > Clean Build Folder。

内容的提问来源于stack exchange，提问作者Gulab Sagevadiya