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Ios 未使用自动完成更新搜索结果_Ios_Swift_Autocomplete_Ios8_Uisearchbar - Fatal编程技术网

Ios 未使用自动完成更新搜索结果

Ios 未使用自动完成更新搜索结果,ios,swift,autocomplete,ios8,uisearchbar,Ios,Swift,Autocomplete,Ios8,Uisearchbar,我正在swift中构建一个应用程序,需要能够搜索城市,我希望搜索能够与自动完成一起工作 因此,我首先在包含UISearch栏及其关联控制器的xib中创建一个视图控制器。我为视图控制器编写的类如下: import UIKit class LocationViewController: UIViewController, UISearchBarDelegate, UITableViewDataSource, UITableViewDelegate, UISearchControllerDelega

我正在swift中构建一个应用程序,需要能够搜索城市,我希望搜索能够与自动完成一起工作

因此,我首先在包含UISearch栏及其关联控制器的xib中创建一个视图控制器。我为视图控制器编写的类如下:

import UIKit

class LocationViewController: UIViewController, UISearchBarDelegate, UITableViewDataSource, UITableViewDelegate, UISearchControllerDelegate {

    // MARK: - Properties

    var dirty: Bool = false
    var loading: Bool = false
    var suggestions: Array<String> = [] {
        didSet {
            searchDisplayController?.searchResultsTableView.reloadData()
        }
    }

    // MARK: - Initialization

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override func viewDidLoad() {
        searchDisplayController?.searchBar.placeholder = "Ville ou adresse"
    }

    // MARK: - UISearchBarDelegate

    func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {

        if countElements(searchText) > 0 {
            if (loading) {
                dirty = true
            } else {
                loadSearchSuggestions()
            }
        }
    }

    func searchBarCancelButtonClicked(searchBar: UISearchBar) {
        suggestions = []
    }

    // MARK: - Search backend

    func loadSearchSuggestions() {

        loading = true

        var query = searchDisplayController?.searchBar.text
        var urlEncode = query!.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())!
        var urlString = "https://maps.googleapis.com/maps/api/place/autocomplete/json?key=MYAPIKEY&components=country:FR&input=\(urlEncode)"

        var request = NSURLRequest(URL: NSURL(string: urlString)!)
        var session = NSURLSession.sharedSession()

        var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in

            if (error != nil) {
                self.loading = false
                println(error.localizedDescription)
                return
            }

            var err: NSError?

            var jsonResult = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers, error: &err) as Dictionary<String,AnyObject>

            var predictions = jsonResult["predictions"] as Array<AnyObject>

            var currentSug: Array<String> = []

            for prediction in predictions {
                var predDict = prediction  as Dictionary<String, AnyObject>

                var adress = predDict["description"] as String

                currentSug.append(adress)

            }

            if err != nil {
                println("JSON Error in search \(err!.localizedDescription)")
                return
            }

            self.suggestions = currentSug

            if self.dirty {
                self.dirty = false
                self.loadSearchSuggestions()
            }

            self.loading = false
        })

        task.resume()
    }

    // MARK: - UITableViewDataSource

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {


        let cellIdentifier = "suggestCell"

        var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as UITableViewCell?

        if cell == nil {
            cell = UITableViewCell(style: .Default, reuseIdentifier: cellIdentifier)
        }

        if suggestions.count > 0 {
            cell!.textLabel!.text = suggestions[indexPath.row]
        }

        return cell!
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return suggestions.count
    }
}
在某一点之前,一切正常。当我在我的搜索框中写一封信时,请求起作用,我得到的结果存储在我的建议变量中

唯一的问题是:包含结果的表视图没有按照建议变量的didSet中指定的那样重新加载。除非我尝试滚动空列表

现在,如果我键入第二个字符,我的表视图将显示仅键入一个字符时的结果。如果我尝试滚动,那么我会得到正确的结果


非常感谢您抽出时间回答我的问题。我可能在代码中犯了错误,因为我对swift和一般编程还是相当陌生。

答案很简单,我看不到

对GoogleAPI的查询是异步完成的,而UI的更新则需要同步完成

以下是LoadSearchSuggestions中self.loading=false之后缺少的代码:


这就是诀窍,希望它能帮助别人

我看不到您在建议数组的didSet中调用tableView.reloadData。因此,每次更新数组时,它都应该重新加载表var建议:array=[]{didSet{searchDisplayController?.searchResultsTableView.reloadData}
self.loading = false

dispatch_async(dispatch_get_main_queue(), {
    searchDisplayController?.searchResultsTableView.reloadData()
})