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compose-multiplatform-patterns

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by Api.AirforcePrepends a system promptAI & Agent Building000 uses202,700

KMP项目中的Compose Multiplatform和Jetpack Compose模式——状态管理、导航、主题化、性能优化和平台特定UI。

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What this skill does

When applied, it prepends a system prompt before your request is sent — no extra calls and no change to how you are billed beyond the added tokens.

---
name: compose-multiplatform-patterns
description: KMP项目中的Compose Multiplatform和Jetpack Compose模式——状态管理、导航、主题化、性能优化和平台特定UI。
origin: ECC
---

# Compose 多平台模式

使用 Compose Multiplatform 和 Jetpack Compose 构建跨 Android、iOS、桌面和 Web 的共享 UI 的模式。涵盖状态管理、导航、主题和性能。

## 何时启用

* 构建 Compose UI(Jetpack Compose 或 Compose Multiplatform)
* 使用 ViewModel 和 Compose 状态管理 UI 状态
* 在 KMP 或 Android 项目中实现导航
* 设计可复用的可组合项和设计系统
* 优化重组和渲染性能

## 状态管理

### ViewModel + 单一状态对象

使用单个数据类表示屏幕状态。将其暴露为 `StateFlow` 并在 Compose 中收集:

```kotlin
data class ItemListState(
    val items: List<Item> = emptyList(),
    val isLoading: Boolean = false,
    val error: String? = null,
    val searchQuery: String = ""
)

class ItemListViewModel(
    private val getItems: GetItemsUseCase
) : ViewModel() {
    private val _state = MutableStateFlow(ItemListState())
    val state: StateFlow<ItemListState> = _state.asStateFlow()

    fun onSearch(query: String) {
        _state.update { it.copy(searchQuery = query) }
        loadItems(query)
    }

    private fun loadItems(query: String) {
        viewModelScope.launch {
            _state.update { it.copy(isLoading = true) }
            getItems(query).fold(
                onSuccess = { items -> _state.update { it.copy(items = items, isLoading = false) } },
                onFailure = { e -> _state.update { it.copy(error = e.message, isLoading = false) } }
            )
        }
    }
}
```

### 在 Compose 中收集状态

```kotlin
@Composable
fun ItemListScreen(viewModel: ItemListViewModel = koinViewModel()) {
    val state by viewModel.state.collectAsStateWithLifecycle()

    ItemListContent(
        state = state,
        onSearch = viewModel::onSearch
    )
}

@Composable
private fun ItemListContent(
    state: ItemListState,
    onSearch: (String) -> Unit
) {
    // Stateless composable — easy to preview and test
}
```

### 事件接收器模式

对于复杂屏幕,使用密封接口表示事件,而非多个回调 lambda:

```kotlin
sealed interface ItemListEvent {
    data class Search(val query: String) : ItemListEvent
    data 

Use this skill

Per request

Add a "skill" field with the skill’s ID to your chat completion request. It is applied server-side before your prompt is sent — no extra calls.

{
  "model": "gpt-4o-mini",
  "skill": "imp-58d4b965-f836-4488-9cb1-a5574dccc21c",
  "messages": [{ "role": "user", "content": "…" }]
}
Always on — no field to send

Install the skill, enable it in your dashboard and (optionally) limit it to specific models. It then applies automatically to every matching request — with no "skill" field to send each time.

Set it up in your dashboard