我想使用 MKLocalSearch 来显示与用户位置相关的结果的预定义字符串的结果，但是到目前为止我看到的所有示例都需要或使用 MKMapView 来设置用户位置，并且可能使用搜索栏来收集搜索所需的文本。
我只想在预定义的字符串上执行搜索并将结果加载到表格视图中，而无需先有地图，是否有一个很好的例子来说明如何做到这一点？
编辑以添加更多细节，包括我当前尝试使用的代码。此代码不会生成结果表。
进一步编辑：下面的 Anna 指出问题可能出在 UISearchDisplayController 中，但是我已经直接从一个工作示例项目中删除了当前代码，所以我真的看不出哪里出了问题，或者为什么 UISearchDisplayController 没有显示结果。
头文件：
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface CallACabViewController : UIViewController <CLLocationManagerDelegate, UITableViewDataSource, UITableViewDelegate, UISearchDisplayDelegate>
{
CLLocationManager *locationManager;
MKLocalSearch *localSearch;
MKLocalSearchResponse *results;
}
-(IBAction)closeButtonClicked:(id)sender;
@end
实现文件：
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
[self.searchDisplayController setDelegate:self];
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
#pragma mark - LocationUpdating
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = [locations lastObject];
CLLocation *oldLocation;
if (locations.count > 1) {
oldLocation = [locations objectAtIndex:locations.count-2];
} else {
oldLocation = nil;
}
NSLog(@"didUpdateToLocation %@ from %@", newLocation, oldLocation);
MKCoordinateRegion userLocation = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 1500.00, 1500.00);
[self performSearch:userLocation];
}
#pragma mark - Search Methods
-(void)performSearch:(MKCoordinateRegion)aRegion
{
// Cancel any previous searches.
[localSearch cancel];
[locationManager stopUpdatingLocation];
// Perform a new search.
MKLocalSearchRequest *request = [[MKLocalSearchRequest alloc] init];
request.naturalLanguageQuery = @"taxi";
request.region = aRegion;
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
localSearch = [[MKLocalSearch alloc] initWithRequest:request];
[localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error){
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
if (error != nil) {
[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Map Error",nil)
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:NSLocalizedString(@"OK",nil) otherButtonTitles:nil] show];
return;
}
if ([response.mapItems count] == 0) {
[[[UIAlertView alloc] initWithTitle:NSLocalizedString(@"No Results",nil)
message:nil
delegate:nil
cancelButtonTitle:NSLocalizedString(@"OK",nil) otherButtonTitles:nil] show];
return;
}
results = response;
[self.searchDisplayController.searchResultsTableView reloadData];
}];
NSLog(@"DEBUG");
}
#pragma mark - TableView Delegate Methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [results.mapItems count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *IDENTIFIER = @"SearchResultsCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:IDENTIFIER];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:IDENTIFIER];
}
MKMapItem *item = results.mapItems[indexPath.row];
cell.textLabel.text = item.name;
cell.detailTextLabel.text = item.placemark.addressDictionary[@"Street"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.searchDisplayController setActive:NO animated:YES];
}
-(IBAction)closeButtonClicked:(id)sender
{
[locationManager stopUpdatingLocation];
[self dismissViewControllerAnimated:YES completion:nil];
}
@end