ios - 使用 MKLocalSearch 在 map 上搜索位置

Question

我想使用 MKLocalSearch 在 map 中进行搜索。此功能在 iOS 6.1+ 中可用。有谁知道如何使用这个或者谁能举例说明如何使用 MKLocalSearch？

MKLocalSearchResponse documentation

Answer 1

MKLocalSearch 的 API很容易理解。最基本的，你

1. alloc-init MKLocalSearchRequest
2. 将其 naturalLanguageQuery 设置为某个搜索词
3. 使用搜索请求初始化一个MKLocalSearch对象
4. 告诉本地搜索开始，将完成处理程序传递给它
5. 对响应中的 MKMapItem 对象数组做一些事情

   ---

搜索咖啡馆:

// Create a search request with a string 
MKLocalSearchRequest *searchRequest = [[MKLocalSearchRequest alloc] init];
[searchRequest setNaturalLanguageQuery:@"Cafe"];

// Create the local search to perform the search
MKLocalSearch *localSearch = [[MKLocalSearch alloc] initWithRequest:searchRequest];
[localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {
    if (!error) {
        for (MKMapItem *mapItem in [response mapItems]) {
            NSLog(@"Name: %@, Placemark title: %@", [mapItem name], [[mapItem placemark] title]);
        }
    } else {
        NSLog(@"Search Request Error: %@", [error localizedDescription]);
    }
}];

---

您可以像这样指定搜索区域:

// Search for Cafes in Paris 
MKLocalSearchRequest *searchRequest = [[MKLocalSearchRequest alloc] init];
[searchRequest setNaturalLanguageQuery:@"Cafe"];
CLLocationCoordinate2D parisCenter = CLLocationCoordinate2DMake(48.8566667, 2.3509871);
MKCoordinateRegion parisRegion = MKCoordinateRegionMakeWithDistance(parisCenter, 15000, 15000);
[searchRequest setRegion:parisRegion];

您还可以从用户放大的 MKMapView 中获取区域。这将提供更好的结果:

[searchRequest setRegion:self.mapView.region];

---

响应对象，一个 MKLocalSearchResponse , 包含 MKMapItem 的数组对象 (mapItems) 和一个名为 boundingRegion 的 MKCoordinateRegion，这是一个包含所有结果的区域。您可以使用它来设置 map View 以显示所有结果:

[self.mapView setRegion:response.boundingRegion];

---

MKMapItem 对象数组不能放置在 map 上(它们用于发送到 map 应用程序)但每个对象都包含一个 placemark 属性，该属性 < em>可以添加到 map 中:

[localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {
    if (!error) {
        for (MKMapItem *mapItem in [response mapItems]) {
            NSLog(@"Name: %@, MKAnnotation title: %@", [mapItem name], [[mapItem placemark] title]);
            NSLog(@"Coordinate: %f %f", [[mapItem placemark] coordinate].latitude, [[mapItem placemark] coordinate].longitude);
            // Should use a weak copy of self
            [self.mapView addAnnotation:[mapItem placemark]];
        }
    } else {
        NSLog(@"Search Request Error: %@", [error localizedDescription]);
    }
}];

搜索都柏林在 map View 和日志上放置一个图钉:

Name: Dublin, Co. Dublin, MKAnnotation title: Dublin, Co. Dublin, Ireland
Coordinate: 53.344104 -6.267494

---

返回的对象中有大量额外的详细信息，尤其是在您搜索企业时。这里有一些:

[localSearch startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error) {
    if (!error) {
        NSLog(@"Results: %@", [response mapItems]);
        MKMapItem *mapItem = [[response mapItems] objectAtIndex:0];
        NSLog(@"Name:%@ Phone:%@ URL:%@", [mapItem name], [mapItem phoneNumber], [mapItem url]);
        NSLog(@"Placemark: %@", [mapItem placemark]);
        MKPlacemark *placemark = [mapItem placemark];
        NSLog(@"Placemark Address: %@", [placemark addressDictionary]);
        MKCoordinateRegion boundingRegion = [response boundingRegion];
        NSLog(@"Bounds: %f %f", boundingRegion.span.latitudeDelta, boundingRegion.span.longitudeDelta);
    }