我正在快速构建一个应用程序，需要能够搜索城市，我希望搜索能够自动完成。我想做一些事情，比如如果用户在搜索框中键入任何字符或单词，它会从mysql数据库中获取从该字符或单词开始的结果，并在自动建议或自动完成中显示结果。我的后端服务准备就绪..唯一的问题是我不知道如何实现这个功能。目前我的代码正在做的是当用户在搜索栏中输入内容时，他点击键盘中的搜索按钮，然后结果出现。希望你能理解我在说什么。这是我目前的代码
class ViewController: UIViewController, UITableViewDataSource, UISearchBarDelegate {
@IBOutlet weak var mySearchBar: UISearchBar!
@IBOutlet weak var myTableView: UITableView!
var dict = NSDictionary()
var searchResults = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return searchResults.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let myCell = tableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath)
myCell.textLabel?.text = searchResults[indexPath.row]
return myCell
}
func searchBarSearchButtonClicked(searchBar: UISearchBar)
{
if(searchBar.text!.isEmpty)
{
return
}
doSearch(searchBar.text!)
}
func doSearch(searchWord: String)
{
mySearchBar.resignFirstResponder()
let myUrl = NSURL(string: "http://localhost/myproject")
let request = NSMutableURLRequest(URL:myUrl!);
let params = ["city" : searchWord]
do {
let data = try NSJSONSerialization.dataWithJSONObject(params, options: .PrettyPrinted)
request.HTTPBody = data
} catch {
//handle error. Probably return or mark function as throws
print("error is \(error)")
//return
}
request.HTTPMethod = "POST";
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let task = NSURLSession.sharedSession().dataTaskWithRequest(request, completionHandler: { (data, response: NSURLResponse?, error:NSError?) -> Void in
dispatch_async(dispatch_get_main_queue()) {
if error != nil
{
// display an alert message
self.displayAlertMessage(error!.localizedDescription)
return
}
let json: NSDictionary?
do {
json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSDictionary
self.searchResults.removeAll(keepCapacity: false)
self.myTableView.reloadData()
if let parseJSON = json {
print(parseJSON)
// var index = 0
self.dict = parseJSON
print("count is \(self.dict.count)")
for var i = 0; i < self.dict.count - 1; i++ {
let cityname = (((self.dict["\(i)"] as?NSDictionary)!["City"] as?NSDictionary)!["name"] as?NSString)! as String
self.searchResults.append(cityname)
}
self.myTableView.reloadData()
}
} catch {
print(error);
}
}
})
task.resume()
}
func displayAlertMessage(userMessage: String)
{
let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.Alert);
let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil)
myAlert.addAction(okAction);
self.presentViewController(myAlert, animated: true, completion: nil)
}
@IBAction func cancelButtonTapped(sender: AnyObject) {
mySearchBar.text = ""
mySearchBar.resignFirstResponder()
}
}
答案 0 :(得分：0)
这是一种技巧：
实施委托 -
搜索栏：textDidChange：
实施方法说＆＃39; UpdateResults＆＃39;这种方法应该这样做 -
一个。检查searchBar是否已更改，在这种情况下设置searchResults 为nil（创建一个实例var searchResults，它是可选的数组。
湾执行网络操作以异步方式获取结果（如 你已经这样做了。）
℃。收到结果后，将它们附加到searchResults（by 创造它，如果它是零）
d。一旦附加了所有搜索结果，就在主线程上调度，然后 使相关结果表重新加载。
答案 1 :(得分：0)
好吧我已经成功实现了搜索。这是我的代码
class CityTableViewController: UITableViewController, UISearchResultsUpdating {
var dict = NSDictionary()
var filterTableData = [String]()
var resultSearchController = UISearchController()
var newTableData = [String]()
override func viewDidLoad() {
super.viewDidLoad()
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()
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if(self.resultSearchController.active){
return self.filterTableData.count
}else {
return dict.count
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CountryTableViewCell
if(self.resultSearchController.active){
cell.cityNameLabel.text = filterTableData[indexPath.row]
return cell
}else{
cell.cityNameLabel.text = (((self.dict["\(indexPath.row)"] as?NSDictionary)!["City"] as?NSDictionary)!["name"] as?NSString)! as String
return cell
}
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
filterTableData.removeAll(keepCapacity: false)
let searchWord = searchController.searchBar.text!
getCityNamesFromServer(searchWord)
let searchPredict = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text!)
print("searchPredict is \(searchController.searchBar.text!)")
for var i = 0; i < self.dict.count; i++ {
let cityname = (((self.dict["\(i)"] as?NSDictionary)!["City"] as?NSDictionary)!["name"] as?NSString)! as String
newTableData.append(cityname)
}
let array = (newTableData as NSArray).filteredArrayUsingPredicate(searchPredict)
print("array is\(array)")
filterTableData = array as! [String]
self.tableView.reloadData()
}
func getCityNamesFromServer(searchWord:String){
let url:String = "http://localhost/"
let params = ["city":searchWord]
ServerRequest.postToServer(url, params: params) { result, error in
if let result = result {
print(result)
self.dict = result
}
}
}
}