如何在 iOS8 中实现 UISearchController？

Question

我尝试在 IOS8 中实现 UISearchController 但失败了。

问题是当我更改了文本和范围按钮时，会向我显示注释。

当我更新搜索栏或范围按钮时，似乎甚至没有调用 updateSearchResultsForSearchController 函数。

这是我的代码：

class SearchTestController: UITableViewController, UISearchResultsUpdating {

struct Candy {
    let category : String
    let name : String
}

var searchcontroller = UISearchController(searchResultsController: nil)




func updateSearchResultsForSearchController(searchController: UISearchController) {
    filteredcandy = candies.filter() { (candy:Candy) -> Bool in
        let scopetest = ( self.category[self.searchcontroller.searchBar.selectedScopeButtonIndex] == "All" ) || ( candy.category == self.category[self.searchcontroller.searchBar.selectedScopeButtonIndex] )
        //let texttest = candy.name.rangeOfString(self.searchcontroller.searchBar.text)
        //let result = scopetest && (texttest != nil)
        return scopetest
    }
    println(filteredcandy.count)
    self.tableView.reloadData()
}


var candies = [Candy]()
var filteredcandy = [Candy]()
var category = ["Chocolate","Hard","Other","All"]


override func viewDidLoad() {
    super.viewDidLoad()

    // Sample Data for candyArray
    self.candies = [Candy(category:"Chocolate", name:"chocolate Bar"),
        Candy(category:"Chocolate", name:"chocolate Chip"),
        Candy(category:"Chocolate", name:"dark chocolate"),
        Candy(category:"Hard", name:"lollipop"),
        Candy(category:"Hard", name:"candy cane"),
        Candy(category:"Hard", name:"jaw breaker"),
        Candy(category:"Other", name:"caramel"),
        Candy(category:"Other", name:"sour chew"),
        Candy(category:"Other", name:"gummi bear")]



    // Reload the table
    self.tableView.reloadData()
    self.tableView.tableHeaderView = searchcontroller.searchBar
    searchcontroller.searchBar.sizeToFit()
    searchcontroller.searchBar.showsSearchResultsButton = true
    self.definesPresentationContext = true
    searchcontroller.searchBar.scopeButtonTitles = category

}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if searchcontroller.active {
        return self.candies.count
    } else {
        return self.candies.count
    }

}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    //ask for a reusable cell from the tableview, the tableview will create a new one if it doesn't have any
    let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! UITableViewCell

    var candy : Candy
    // Check to see whether the normal table or search results table is being displayed and set the Candy object from the appropriate array
    if searchcontroller.active {
         candy = filteredcandy[indexPath.row]
    } else {
        candy = candies[indexPath.row]
    }


    // Configure the cell
    cell.textLabel!.text = candy.name
    cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator

    return cell
}

Answer 1

将以下行添加到viewDidLoad()

searchcontroller.searchResultsUpdater = self
searchcontroller.delegate = self

更新：

在viewDidLoad()中添加以下行

searchcontroller.searchBar.delegate = self

然后更新searchBar(_:selectedScopeButtonIndexDidChange:)中的搜索结果