objective-c - NSUserActivity 和 CoreSpotlight 的使用

Question

我花了很多时间来寻找 NSUserActivity 相对于 CoreSpotlight 的优势，尽管我实际上找不到任何东西。

实际上，它无法索引我们通过 NSUserActivity 设置的项目。我在下面附上了我的代码片段，它应该按照苹果文档工作，但事实并非如此。

        let personName = "Jon Doe"
        let activity = NSUserActivity(activityType: "com.SearchAPIs.test”)
        activity.userInfo = ["name": "Jon Doe"]
        activity.title = person.name
        let keywords = personName.componentsSeparatedByString(" ")
        activity.keywords = Set(keywords)
        activity.eligibleForSearch = true
        activity.eligibleForPublicIndexing = true
        activity.expirationDate = NSDate().dateByAddingTimeInterval(16666600)
        activity.becomeCurrent()

我想找到答案

Why we need to use NSUserActivity in way of search, since it can be possible with CoreSpotlight?

Answer 1

根据苹果文档

To guarantee that the activity and its metadata get indexed, you must hold a strong reference to the activity until it gets added to the index. There are two ways to do this: The first way is to assign the activity to a property in the controller object that creates the activity. The second way is to use the userActivity property of the UIResponder object. If you use the second way, you need to set the metadata—such as information in the userInfo property—in the updateUserActivityState: method; otherwise, the metadata you set on the activity will not be persisted.

您的事件在索引之前已被释放，最好使用 self 保留。

你的第二个问题的答案对我来说仍然是个谜。

也许这就像 CoreSpotlight 不提供的性能、索引中的项目数量，以及重要的是 CoreSpotlight 不提供的公共(public)索引。我们必须再等待一段时间才能得到您问题的答案。