Swift 在CollectionView中搜索对象

我有这样的英雄目标：

import Foundation
import UIKit

class Hero {

    var name: String!
    var image: UIImage? {
        return UIImage(named: "\(name)")!
    }

    required init(name: String) {
        self.name = name
    }
}

heroesFiltered = heroes.filter({ (hero) -> Bool in
            let nameText: NSString = hero.name

            return (nameText.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch).location) != NSNotFound
        })

我想在搜索栏上搜索英雄，以下是我的搜索功能：

func filterContentForSearchText(searchText:String) {
        let searchBarTemp = searchBar
        heroesFiltered = heroes.filter { (hero) -> Bool in
            if hero.name.lowercaseString == searchBarTemp!.text?.lowercaseString {
                return true
            }
            return false
        }
    }

但当我搜索时，它根本没有被过滤，当我在搜索栏中更改文本时，数组是空的

我还尝试使用NSPredicate进行搜索：

func filterContentForSearchText(searchText:String) {
    heroesFiltered = []

    let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", self.searchBar!.text!)
    let array = (heroes as NSArray).filteredArrayUsingPredicate(searchPredicate)
    heroesFiltered = array as? [Hero]
}

但它在这条线上崩溃了：

let array = (heroes as NSArray).filteredArrayUsingPredicate(searchPredicate)

---

我试过这样做：

import Foundation
import UIKit

class Hero {

    var name: String!
    var image: UIImage? {
        return UIImage(named: "\(name)")!
    }

    required init(name: String) {
        self.name = name
    }
}

heroesFiltered = heroes.filter({ (hero) -> Bool in
            let nameText: NSString = hero.name

            return (nameText.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch).location) != NSNotFound
        })

它成功了