spotlight在Home界面下拉后搜索

1. 在工程 - General - Linked Frameworks and Libraries 里添加 CoreSpotlight 和 MobileCoreServices 框架，这样就可以用使用 CSSearchableItem 的属性了

2.设置属性
1). searchableItems

var searchableItems = [CSSearchableItem]()

2). 设置searchableItemAttributeSet的属性

//点击了搜索栏里的一项后可在回调里拿到uniqueIdentifier

 let searchableItem CSSearchableItem(uniqueIdentifier: "com.appcoda.SpotIt.\(i)", domainIdentifier: "movies", attributeSet: searchableItemAttributeSet)

3). searchableItems.append(searchableItem)

所有代码：

    var searchableItems = [CSSearchableItem]()
    for i in 0...(moviesInfo.count - 1) {
        
        let movie = moviesInfo[i] as! [String: String]
        let searchableItemAttributeSet = CSSearchableItemAttributeSet(itemContentType: kUTTypeText as String)
        
        //set the title
        searchableItemAttributeSet.title = movie["Title"]!
        
        //set the image
        let imagePathParts = movie["Image"]!.componentsSeparatedByString(".")
        searchableItemAttributeSet.thumbnailURL = NSBundle.mainBundle().URLForResource(imagePathParts[0], withExtension: imagePathParts[1])
        
        // Set the description.
        searchableItemAttributeSet.contentDescription = movie["Description"]!
        
        var keywords = [String]()
        let movieCategories = movie["Category"]!.componentsSeparatedByString(", ")
        for movieCategory in movieCategories {
            keywords.append(movieCategory)
        }
        
        let stars = movie["Stars"]!.componentsSeparatedByString(", ")
        for star in stars {
            keywords.append(star)
        }
        
        searchableItemAttributeSet.keywords = keywords
        
        let searchableItem = CSSearchableItem(uniqueIdentifier: "com.appcoda.SpotIt.\(i)", domainIdentifier: "movies", attributeSet: searchableItemAttributeSet)
        
        searchableItems.append(searchableItem)
        
        CSSearchableIndex.defaultSearchableIndex().indexSearchableItems(searchableItems) { (error) -> Void in
            if error != nil {
                print(error?.localizedDescription)
            }
        }
    }

4.回调

 override func restoreUserActivityState(activity: NSUserActivity) {
    
    if activity.activityType == CSSearchableItemActionType {
        if let userInfo = activity.userInfo {
            //CSSearchableItemActivityIdentifier对应上面的uniqueIdentifier
            let selectedMovie = userInfo[CSSearchableItemActivityIdentifier] as! String
            selectedMovieIndex = Int(selectedMovie.componentsSeparatedByString(".").last!)
            performSegueWithIdentifier("idSegueShowMovieDetails", sender: self)
        }
    }
}