Swift：使用 UISearchController/Predicates 过滤结构数组

想知道是否有人可以帮助我在 Swift 中使用谓词进行过滤。

我有一个有点混乱的数据源，我用它来填充 UITableView。数据源是一个结构体数组。该结构体定义如下：

struct Exercises {
    let category: String
    let name : String
    let x_seed: [Double]
    let y_seed: [Double]
    let hasMult: Bool
}

现在，在我的表视图控制器中，我持有一个结构数组，其中包含表的所有数据。

class MainTableViewController: UITableViewController, UISearchResultsUpdating {


var exercises = [Exercises]()
var filtered_exercises = [Exercises]()
var resultSearchController = UISearchController()

override func viewDidLoad() {
    super.viewDidLoad()

    // MARK: - Table view data source
    self.exercises = [
        Exercises(category:"Sports", name:"Bowling", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
        Exercises(category:"Sports", name:"Water Polo", x_seed:[125,155,185], y_seed:[10.00, 12.40,14.80], hasMult:false),
        Exercises(category:"Sports", name:"Handball", x_seed:[125,155,185], y_seed:[12.00, 14.87, 17.77], hasMult:false),
        Exercises(category:"Sports", name:"Dancing", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:true),
        Exercises(category:"Sports", name:"Frisbee", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
        Exercises(category:"Sports", name:"Volleyball", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
        Exercises(category:"Sports", name:"Archery", x_seed:[125,155,185], y_seed:[3.50, 4.33, 5.17], hasMult:false),
        Exercises(category:"Sports", name:"Golf", x_seed:[125,155,185], y_seed:[3.50, 4.33, 5.17], hasMult:true)]

    self.resultSearchController = ({
        let controller = UISearchController(searchResultsController: nil)
        controller.searchResultsUpdater = self
        controller.dimsBackgroundDuringPresentation = false
        controller.searchBar.sizeToFit()

        self.tableView.tableHeaderView = controller.searchBar

        return controller
    })()

    self.tableView.reloadData()
}

我想做的是过滤练习基于“名称”字段的数组并填充新的数据源filtered_exercises以填充表视图。我不确定如何在这种情况下使用谓词。

// Search functionality 
func updateSearchResultsForSearchController(searchController: UISearchController)
{
    filtered_exercises.removeAll(keepCapacity: false)

    let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
    // ??????????????

    self.tableView.reloadData()
}

我知道我可以读取字符串数组中的所有名称并轻松地将其显示在表格视图中。问题是我需要保留结构，因为其中包含的数据传递到其他视图控制器。

那么，如何过滤结构数组？

Thanks!

如果你不坚持NSPredicate（不明白为什么你应该这样做，因为你没有使用NSFetchRequest，...），这是代码：

struct Exercises {
  let category: String
  let name : String
  let x_seed: [Double]
  let y_seed: [Double]
  let hasMult: Bool
}

let exercises = [
  Exercises(category:"Sports", name:"Bowling", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
  Exercises(category:"Sports", name:"Water Polo", x_seed:[125,155,185], y_seed:[10.00, 12.40,14.80], hasMult:false),
  Exercises(category:"Sports", name:"Handball", x_seed:[125,155,185], y_seed:[12.00, 14.87, 17.77], hasMult:false),
  Exercises(category:"Sports", name:"Dancing", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:true),
  Exercises(category:"Sports", name:"Frisbee", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
  Exercises(category:"Sports", name:"Volleyball", x_seed:[125,155,185], y_seed:[3.00, 3.73, 4.43], hasMult:false),
  Exercises(category:"Sports", name:"Archery", x_seed:[125,155,185], y_seed:[3.50, 4.33, 5.17], hasMult:false),
  Exercises(category:"Sports", name:"Golf", x_seed:[125,155,185], y_seed:[3.50, 4.33, 5.17], hasMult:true)
]

let options = NSStringCompareOptions.CaseInsensitiveSearch | NSStringCompareOptions.DiacriticInsensitiveSearch

// Filter exercises by name (case and diacritic insensitive)
let filteredExercises = exercises.filter {
  $0.name.rangeOfString("Ol", options: options) != nil
}

let filteredExerciseNames = ", ".join(filteredExercises.map({ $0.name }))
println(filteredExerciseNames)

它打印水球、排球、高尔夫.