我想使用
MKLocalSearch
在地图中进行搜索。这个功能在iOS 6.1+中可用。有人知道如何使用它,或者可以给出一个MKLocalSearch
的使用示例吗?
MKLocalSearchResponse文档
MKLocalSearch
在地图中进行搜索。这个功能在iOS 6.1+中可用。有人知道如何使用它,或者可以给出一个MKLocalSearch
的使用示例吗?
MKLocalSearchResponse文档
MKLocalSearch
的API相当容易理解。其最基本的用法是:
alloc-init
一个MKLocalSearchRequest
对象 naturalLanguageQuery
设置为某个搜索词 MKLocalSearch
对象 MKMapItem
对象数组执行某些操作
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]);
}
}];
// 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];
MKMapView
中获取区域。这将提供更好的结果:[searchRequest setRegion:self.mapView.region];
MKLocalSearchResponse
,包含一个 MKMapItem
对象数组 (mapItems
) 和一个名为 boundingRegion
的 MKCoordinateRegion
,它是包含所有结果的区域。您可以使用它来设置地图视图以显示所有结果:[self.mapView setRegion:response.boundingRegion];
MKMapItem
对象的数组不能放置在地图上(它们用于发送到地图应用程序),但每个对象包含一个placemark
属性,该属性可以添加到地图中:
[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]);
}
}];
搜索都柏林地点会在地图视图上放置一个标记并记录:
Name: Dublin, Co. Dublin, MKAnnotation title: Dublin, Co. Dublin, Ireland
Coordinate: 53.344104 -6.267494
返回的对象中有很多额外的细节,特别是如果你搜索企业。以下是一些示例:
[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);
}
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);
}
}];
MKErrorDomain
和代码为4
的错误。