Question

我想使用MKLocalSearch在地图中搜索。此功能在iOS 6.1+中可用。有人知道如何使用这个或任何人都可以举例说明如何使用MKLocalSearch？

Answer 1

MKLocalSearch的API相当容易理解。你最基本的是

alloc-init和MKLocalSearchRequest
将其naturalLanguageQuery设置为某个搜索字词
使用搜索请求初始化MKLocalSearch对象
告诉本地搜索开始，将其传递给完成处理程序
对响应中的MKMapItem个对象执行某些操作

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。这将带来更好的结果：

[searchRequest setRegion:self.mapView.region];

响应对象MKLocalSearchResponse包含一组MKMapItem个对象（mapItems）和一个名为MKCoordinateRegion的{{1}}，该区域是包含所有结果。您可以使用它来设置地图视图以显示所有结果：

boundingRegion

[self.mapView setRegion:response.boundingRegion];个对象的数组不能放在地图上（它们用于发送到地图应用）但每个都包含一个{em}可以MKMapItem属性>被添加到地图中：

placemark

搜索都柏林在地图视图和日志上放置一个图钉：

[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]);
    }
}];

返回的对象中有大量额外的细节，特别是在您搜索商家时。以下是一些：

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

Answer 2

以下是在给定位置周围1公里范围内搜索咖啡馆的示例：

MKLocalSearchRequest *request = [[MKLocalSearchRequest alloc] init];
CLLocationCoordinate2D location = CLLocationCoordinate2DMake(11.567898, 104.894430);
request.naturalLanguageQuery = @"cafe";
request.region = MKCoordinateRegionMakeWithDistance(location, 1000, 1000);
MKLocalSearch *search = [[MKLocalSearch alloc] initWithRequest:request];
[search startWithCompletionHandler:^(MKLocalSearchResponse *response, NSError *error){
    for (MKMapItem *item in response.mapItems) {
        NSLog(@"%@", item.name);
    }
}];

请注意，与搜索失败相比，它不会返回空列表，但会显示域MKErrorDomain和代码4的错误。

Answer 3

这是Localsearch的教程

http://jeffreysambells.com/2013/01/28/mklocalsearch-example

使用MKLocalSearch搜索地图上的位置

3 个答案: