今年 Notification 有改动吗？比如 Sendable
Asked on 06/19/2025
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在WWDC 2025的“What's new in Swift”会议中，关于通知的处理有一些改动。具体来说，通知名称和负载现在支持具体类型（concrete types），这使得编译器可以检查对象是否支持你注册的通知类型。这种改动减少了处理通知负载时的样板代码，并且通知类型还指定了通知发布的位置。对于在主线程上发布的通知，符合mainactor消息的通知保证总是同步发布在主线程上。对于异步消息，通知会在任意线程上异步发布。这些具体的通知类型在UIKit和Foundation等框架中可用，你也可以为自己的通知添加具体类型。
关于Sendable，虽然在“What's new in Swift”会议中没有直接提到Sendable与通知的关系，但在“迁移到Swift 6”会议中提到了一些关于Sendable的内容。具体来说，标记类型为Sendable可以帮助解决数据竞争问题。
如果你对这些改动的具体细节感兴趣，可以查看What's new in Swift (10:45)的相关章节。
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