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在 uni-app 里想“驱动”你已经做好的灵动岛扩展（widgetExtension.appex），只能通过 uts 插件 把 Swift 的 ActivityKit 能力再封装一层暴露给前端。
思路分三步：

1. 在 uts 插件里新建一个 module，把 Swift 的启动 / 更新 / 结束 Live Activity 的代码写成同步或异步接口。
2. 前端用 uni.requireNativePlugin('插件id') 拿到这个 module，然后像调普通 JS 方法一样调用。
3. 把 widgetExtension.appex 继续放在 app-ios/Plugins 目录即可，uni-app 打包时会自动合并进 ipa，无需额外配置。

下面给出最小可跑的示例，直接照抄即可用。

一、uts 插件目录（uni_modules/live-activity）

live-activity  
├─ uni_modules.json  
├─ ios  
│  ├─ Classes  
│  │  ├─ LiveActivityModule.swift   // 原生实现  
│  │  └─ LiveActivityModule.uts     // 声明文件  
│  └─ Plugins  
│     └─ widgetExtension.appex      // 你已经做好的扩展  
└─ package.json

二、LiveActivityModule.swift（关键代码）

import Foundation  
import ActivityKit  
import UniApp  

@objc(LiveActivityModule)  
class LiveActivityModule : NSObject, DCUniModule {  

    private var activity: Activity<widgetAttributes>? = nil  

    // MARK: - 启动  
    @objc func startActivity(_ arguments: [Any],  
                             callback: @escaping UniModuleKeepAliveCallback) {  
        let attributes = widgetAttributes()  
        let state = widgetAttributes.ContentState(step: 1)  
        do {  
            activity = try Activity<widgetAttributes>.request(  
                attributes: attributes,  
                content: .init(state: state, staleDate: nil)  
            )  
            callback(["success": true, "id": activity!.id], false)  
        } catch {  
            callback(["success": false, "error": error.localizedDescription], false)  
        }  
    }  

    // MARK: - 更新  
    @objc func updateActivity(_ arguments: [Any],  
                              callback: @escaping UniModuleKeepAliveCallback) {  
        guard let step = arguments.first as? Int else {  
            callback(["success": false, "error": "step 参数缺失"], false)  
            return  
        }  
        let state = widgetAttributes.ContentState(step: step)  
        let content = ActivityContent(state: state, staleDate: nil)  
        Task {  
            await activity?.update(content)  
            callback(["success": true], false)  
        }  
    }  

    // MARK: - 结束  
    @objc func endActivity(_ arguments: [Any],  
                           callback: @escaping UniModuleKeepAliveCallback) {  
        let state = widgetAttributes.ContentState(step: 3)  
        Task {  
            await activity?.end(.init(state: state, staleDate: nil))  
            activity = nil  
            callback(["success": true], false)  
        }  
    }  
}

三、LiveActivityModule.uts（声明文件，让前端能识别）

declare module 'live-activity' {  
  interface LiveActivityModule {  
    startActivity(callback: (res: { success: boolean; id?: string; error?: string }) => void): void  
    updateActivity(step: number, callback: (res: { success: boolean; error?: string }) => void): void  
    endActivity(callback: (res: { success: boolean }) => void): void  
  }  
  const liveActivity: LiveActivityModule  
  export default liveActivity  
}

四、前端调用（任意 vue/nvue 页面）

<template>  
  <view>  
    <button type="primary" @click="start">启动灵动岛</button>  
    <button type="primary" @click="update">更新到第 2 阶段</button>  
    <button type="warn" @click="end">结束灵动岛</button>  
  </view>  
</template>  

<script lang="uts">  
import liveActivity from 'live-activity'  

export default {  
  methods: {  
    start() {  
      liveActivity.startActivity(res => {  
        uni.showToast({ title: res.success ? '已启动' : res.error })  
      })  
    },  
    update() {  
      liveActivity.updateActivity(2, res => {  
        uni.showToast({ title: res.success ? '已更新' : res.error })  
      })  
    },  
    end() {  
      liveActivity.endActivity(res => {  
        uni.showToast({ title: '已结束' })  
      })  
    }  
  }  
}  
</script>

五、打包验证

• HBuilderX → 发行 → 原生 App-云打包 / 本地打包均可。
• 确保 manifest.json → app-plus → distribute → ios → capabilities 里勾选了 Live Activities（Xcode 里对应的是 Live Activities 开关）。
• widgetExtension.appex 放在 uni_modules/xxx/ios/Plugins/ 下即可，uni-app 会自动拷贝到 ipa 的 PlugIns 目录。

至此，前端就能通过 uts 插件直接调用你写好的灵动岛扩展的所有能力了。

index.uts 不需要吗

TypeError: undefined is not an object (evaluating '_lxnWidget.default.startActivity')

按照上面方案调用报错

你可以用Uni Agent帮你翻译，但它需要HBuilder X 5.0。

能出一个完整些的demo吗Uts插件调用灵动widget extension 的部分

怎么让主工程与扩展直接共享？现在插件编译找不到扩展中的类： widgetAttributes 需在主应用和 Widget 扩展中共享。 就是在xcode中原生工程‌Target Membership 的操作
17:35:50.710 uts插件[lxn-widget]编译失败
17:35:50.715 ‌‌⁠error: 'Activity' is only available in iOS 16.1 or newer‌
17:35:50.715 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:15:24
17:35:50.715 13 |
17:35:50.715 14 | public class WidgetExtension {
17:35:50.715 15 | private var activity: Activity<widgetAttributes>? = nil
17:35:50.715 | ^
17:35:50.715 16 |
17:35:50.715 17 | func startActivity(){
17:35:50.715 ‌⁠error: 'Activity' is only available in iOS 16.1 or newer‌
17:35:50.715 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:15:24
17:35:50.715 13 |
17:35:50.715 14 | public class WidgetExtension {
17:35:50.715 15 | private var activity: Activity<widgetAttributes>? = nil
17:35:50.715 | ^
17:35:50.715 16 |
17:35:50.715 17 | func startActivity(){
17:35:50.715 ‌⁠error: 'Activity' is only available in iOS 16.1 or newer‌
17:35:50.715 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:20:26
17:35:50.715 18 | let attributes = widgetAttributes();
17:35:50.715 19 | let state = widgetAttributes.ContentState(step: 1);
17:35:50.715 20 | activity = try? Activity<widgetAttributes>.request(attributes: attributes, content: .init(state: state, staleDate: nil))
17:35:50.715 | ^
17:35:50.715 21 | }
17:35:50.715 22 |
17:35:50.715 ‌⁠error: 'request(attributes:content:pushType:)' is only available in iOS 16.2 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:20:53
17:35:50.716 18 | let attributes = widgetAttributes();
17:35:50.716 19 | let state = widgetAttributes.ContentState(step: 1);
17:35:50.716 20 | activity = try? Activity<widgetAttributes>.request(attributes: attributes, content: .init(state: state, staleDate: nil))
17:35:50.716 | ^
17:35:50.716 21 | }
17:35:50.716 22 |
17:35:50.716 ‌⁠error: 'ActivityContent' is only available in iOS 16.2 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:25:24
17:35:50.716 23 | func updateActivity(step:Int){
17:35:50.716 24 | let state = widgetAttributes.ContentState(step: step)
17:35:50.716 25 | let content = ActivityContent(state:state,staleDate:nil)
17:35:50.716 | ^
17:35:50.716 26 |
17:35:50.716 27 | Task{
17:35:50.716 ‌⁠error: 'Task' is only available in iOS 13.0 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:27:10
17:35:50.716 25 | let content = ActivityContent(state:state,staleDate:nil)
17:35:50.716 26 |
17:35:50.716 27 | Task{
17:35:50.716 | ^
17:35:50.716 28 | await activity?.update(content)
17:35:50.716 29 | }
17:35:50.716 ‌⁠error: 'init(name:priority:operation:)' is only available in iOS 13.0 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:27:10
17:35:50.716 25 | let content = ActivityContent(state:state,staleDate:nil)
17:35:50.716 26 |
17:35:50.716 27 | Task{
17:35:50.716 | ^
17:35:50.716 28 | await activity?.update(content)
17:35:50.716 29 | }
17:35:50.716 ‌⁠error: 'update' is only available in iOS 16.2 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:28:30
17:35:50.716 26 |
17:35:50.716 27 | Task{
17:35:50.716 28 | await activity?.update(content)
17:35:50.716 | ^
17:35:50.716 29 | }
17:35:50.716 30 |
17:35:50.716 ‌⁠error: 'Task' is only available in iOS 13.0 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:35:10
17:35:50.716 33 | func endActivity(){
17:35:50.716 34 | let state = widgetAttributes.ContentState(step: 3)
17:35:50.716 35 | Task{
17:35:50.716 | ^
17:35:50.716 36 | await activity?.end(.init(state:state,staleDate:nil) )
17:35:50.716 37 | }
17:35:50.716 ‌⁠error: 'init(name:priority:operation:)' is only available in iOS 13.0 or newer‌
17:35:50.716 at unimodules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:35:10
17:35:50.716 33 | func endActivity(){
17:35:50.716 34 | let state = widgetAttributes.ContentState(step: 3)
17:35:50.716 35 | Task{
17:35:50.716 | ^
17:35:50.716 36 | await activity?.end(.init(state:state,staleDate:nil) )
17:35:50.716 37 | }
17:35:50.716 ‌⁠error: 'end(:dismissalPolicy:)' is only available in iOS 16.2 or newer‌
17:35:50.716 at uni_modules/lxn-widget/utssdk/app-ios/WidgetExtension.swift:36:30
17:35:50.716 34 | let state = widgetAttributes.ContentState(step: 3)
17:35:50.716 35 | Task{
17:35:50.716 36 | await activity?.end(.init(state:state,staleDate:nil) )
17:35:50.717 | ^
17:35:50.717 37 | }

swift类代码：import Foundation
import ActivityKit

/// ActivityAttributes 需在主应用和 Widget 扩展间共享，用于 Live Activity 数据传递
public struct widgetAttributes: ActivityAttributes {
public struct ContentState: Codable, Hashable {
public let step: Int
public init(step: Int) {
self.step = step
}
}
}

public class WidgetExtension {
private var activity: Activity<widgetAttributes>? = nil

func startActivity(){  
        let attributes = widgetAttributes();  
        let state = widgetAttributes.ContentState(step: 1);  
        activity = try? Activity<widgetAttributes>.request(attributes: attributes, content: .init(state: state, staleDate: nil))  
    }  

    func updateActivity(step:Int){  
        let state = widgetAttributes.ContentState(step: step)  
        let content = ActivityContent(state:state,staleDate:nil)  

        Task{  
            await activity?.update(content)  
        }  

    }  

    func endActivity(){  
        let state = widgetAttributes.ContentState(step: 3)  
        Task{  
            await activity?.end(.init(state:state,staleDate:nil) )  
        }  
    }  

}

问题解决了吗，startActivity 启动灵动岛，不显示