我正在尝试将搜索功能添加到我在XCode 6上的swift上工作的基于地图的项目。我已将SearchDisplayController添加到我的主视图控制器，其中包含地图。我创建了一个名为MapSearchDisplayController的类，它实现了必要的方法。我还将SearchDisplayController的Custom Class属性更改为故事板中的MapSearchDisplayController。
在故事板中，我将SearchDisplayController拖到我的主视图控制器上以创建IBOutlet。我对主视图控制器的主viewDidLoad如下所示：
class ViewController: UIViewController, CCHMapClusterControllerDelegate, MKMapViewDelegate, ADBannerViewDelegate {
@IBOutlet weak var mapSearchDisplayController1: MapSearchDisplayController!
@IBOutlet var mapSearchDisplayController: MapSearchDisplayController!
@IBOutlet weak var banner: ADBannerView!
@IBOutlet weak var mMap: MKMapView!
var clusterController:CCHMapClusterController?
let mMaxZoomLevelForClustering : Double = 13
let mMinUniqueLocationsForClustering : UInt = 1
var formatter = NSNumberFormatter()
var databasePath = NSString()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
banner.delegate = self
// Add button to navbar
var filterButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Organize, target: self, action: nil)
self.navigationItem.leftBarButtonItem = filterButton
var aboutButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: "aboutAction")
var searchButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Search, target: self, action: "searchAction")
var rButtons : [UIBarButtonItem] = [aboutButton, searchButton]
self.navigationItem.rightBarButtonItems = rButtons
// Deal with Search Display Controller
self.mapSearchDisplayController.delegate = self.mapSearchDisplayController;
self.mapSearchDisplayController.searchResultsDataSource = self.mapSearchDisplayController;
self.mapSearchDisplayController.searchResultsDelegate = self.mapSearchDisplayController;
self.mapSearchDisplayController.searchBar.placeholder = "Search Destination";
self.mapSearchDisplayController.searchResultsTableView.delegate = self.mapSearchDisplayController
self.mapSearchDisplayController.searchResultsTableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")
问题1：我必须添加一个额外的mapSearchDisplayController 1 - 否则我的mapSearchDisplayController是nil，当我尝试使用它时我遇到了异常。现在，当我有一个额外的变量mapSearchDisplayController 1 （它被声明但从未使用过）时，它不会抛出异常并且某些功能正在运行。试图添加/删除弱，但它没有任何区别。我无法弄清楚我错过了什么导致这种行为。
Isse 2：我遇到的更大问题是，处理搜索相关功能的mapSearchDisplayController的实例变量是nil，它的init方法没有被调用，但是函数在委托方法有效。因此，data1变量为nil，尽管被初始化为硬编码字符串数组。所有其他成员也一样，包括googleAPIKey，这是一个常量。如果shouldReloadTableForSearchString再次设置data1 data1 = ["1111", "222", "ZAAAA"]然后它仍然被初始化，但是如果我将data1作为searchresult分配给它 - 它就会丢失。我会理解，如果整个对象是nil，但是方法正在被调用和工作，它只是一个实例变量和init，它们不是“工作”。代码如下：
class MapSearchDisplayController: UISearchDisplayController, UISearchDisplayDelegate, UITableViewDataSource, UITableViewDelegate, LPGoogleFunctionsDelegate
{
var data1 : [String]! = ["1111", "222", "ZAAAA"]
var googleFunctions : LPGoogleFunctions? = LPGoogleFunctions()
let googleAPIKey = "myKey"
//MARK: UITableViewDelegate
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
println("In numberOfRowsInSection - \(data1.count)")
return self.data1.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
println("In cellForRowAtIndexPath")
var cell = tableView.dequeueReusableCellWithIdentifier("Cell") as? UITableViewCell
if !(cell != nil) {
println("new cellForRow")
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
}
// Get the corresponding candy from our candies array
let candy = self.data1[indexPath.row]
// Configure the cell
cell!.textLabel.text = candy
cell!.detailTextLabel?.text = "Cell Details"
return cell!
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
// Dismiss search display controller
self.active = false;
// Force selected annotation to be on map
}
func tableView(tableView: UITableView, numberOfSectionsInTableView indexPath: NSIndexPath) -> Int{
println("numberOfSectionsInTableView")
return 1
}
//MARK: Search methods
func filterContentForSearchText (searchText: String) {
println(searchText)
}
func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchString searchString: String!) -> Bool {
var length : Int32 = Int32(countElements(searchString))
if (countElements(searchString) < 3 ) {
println("Short searchString. Not enough info")
return false
}
data1 = []
if (googleFunctions == nil)
{
googleFunctions = LPGoogleFunctions()
googleFunctions!.sensor = false
googleFunctions!.delegate = self
googleFunctions!.googleAPIBrowserKey = "myKey"
}
println(googleFunctions?.googleAPIBrowserKey)
googleFunctions?.loadPlacesAutocompleteWithDetailsForInput(searchString, offset: length, radius: 0, location: nil, placeType: LPGooglePlaceTypeGeocode, countryRestriction: nil, successfulBlock: {(pd : [AnyObject]!) in
println("--------------GOOGLE search success")
for place in pd{
var pl = place as LPPlaceDetails
self.data1.append(pl.name)
println(pl.name)
}
}
, failureBlock: {(status : LPGoogleStatus) in
println("---- GOOGLE failed")
})
//data1 = ["1111", "222", "ZAAAA"]
return true
}
func searchDisplayControllerWillBeginSearch(controller: UISearchDisplayController!){
controller.searchBar.showsCancelButton = true
}
func searchDisplayControllerWillEndSearch(controller: UISearchDisplayController!){
println("searchDisplayControllerWillEndSearch")
}
//MARK: LPGogleFunctions methods
override init() {
println("Initializing GoogleFunctions")
if (googleFunctions == nil){
googleFunctions = LPGoogleFunctions()
}
data1 = []
super.init()
googleFunctions!.sensor = false
googleFunctions!.delegate = self
googleFunctions!.googleAPIBrowserKey = "myKey"
}
}
非常感谢任何帮助。
答案 0 :(得分：0)
我正在回答我自己的问题，万一有人遇到同样的问题。
问题＃1我通过删除两个IBOutlet并在故事板中重新添加它来解决这个问题。
发布＃2：我没有调用searchResultsTableView.reloadData（）。 由于网络调用是异步的，因此在更新tableview之后会在lambda中收到结果。强制更新可以解决问题。