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WidgetKit Code Review

WidgetKit 代码评审

Quick Reference

快速参考

Issue Type	Reference
TimelineProvider, entries, reload policies	references/timeline.md
Widget families, containerBackground, deep linking	references/views.md
AppIntentConfiguration, EntityQuery, @Parameter	references/intents.md
Refresh budget, memory limits, caching	references/performance.md

问题类型	参考链接
TimelineProvider、entries、重载策略	references/timeline.md
Widget 系列、containerBackground、深度链接	references/views.md
AppIntentConfiguration、EntityQuery、@Parameter	references/intents.md
刷新预算、内存限制、缓存	references/performance.md

Review Checklist

评审检查清单

```
placeholder(in:)
```
returns immediately without async work
Timeline entries spaced at least 5 minutes apart
```
getSnapshot
```
checks
```
context.isPreview
```
for gallery previews
```
containerBackground(for:)
```
used for iOS 17+ compatibility
```
widgetURL
```
used for systemSmall (not Link)
No Button views (use Link or widgetURL)
No AsyncImage or UIViewRepresentable in widget views
Images downsampled to widget display size (~30MB limit)
App Groups configured for data sharing between app and widget
EntityQuery implements
```
defaultResult()
```
for non-optional parameters
New intent parameters handle nil for existing widgets after updates
```
reloadTimelines
```
called strategically (not on every data change)

```
placeholder(in:)
```
立即返回，不执行异步操作
时间线条目间隔至少5分钟
```
getSnapshot
```
针对图库预览检查
```
context.isPreview
```
使用
```
containerBackground(for:)
```
以兼容iOS 17+
针对systemSmall尺寸使用
```
widgetURL
```
（而非Link）
不使用Button视图（改用Link或widgetURL）
小组件视图中不使用AsyncImage或UIViewRepresentable
图片已下采样至小组件显示尺寸（约30MB限制）
已配置App Groups以实现应用与小组件之间的数据共享
EntityQuery 为非可选参数实现了
```
defaultResult()
```
新增的意图参数在更新后能处理现有小组件的nil值
策略性调用
```
reloadTimelines
```
（而非每次数据变更都调用）

When to Load References

何时查阅参考资料

TimelineProvider implementation or refresh issues -> timeline.md
Widget sizes, Lock Screen, containerBackground -> views.md
Configurable widgets, AppIntent migration -> intents.md
Memory issues, caching, budget management -> performance.md

TimelineProvider 实现或刷新问题 -> timeline.md
小组件尺寸、锁屏、containerBackground -> views.md
可配置小组件、AppIntent 迁移 -> intents.md
内存问题、缓存、预算管理 -> performance.md

Review Questions

评审问题

Does the widget provide fallback entries for when system delays refresh?
Are Lock Screen families (accessoryCircular/Rectangular/Inline) handled appropriately?
Would migrating from IntentConfiguration break existing user widgets?
Is timeline populated with future entries or does it rely on frequent refreshes?
Is data cached via App Groups for widget access?

当系统延迟刷新时，小组件是否提供了备用条目？
锁屏系列（accessoryCircular/Rectangular/Inline）是否得到了恰当处理？
从IntentConfiguration迁移是否会破坏现有用户的小组件？
时间线是否填充了未来条目，还是依赖频繁刷新？
是否通过App Groups缓存数据以供小组件访问？