Search for the specified string address

-(void) viewdidload

{

[Super Viewdidload];

Self.geocoder = [[Clgeocoder alloc]init];

Set the map to zoom

self.mapView.zoomEnabled = YES;

Set up a map to scroll

self.mapView.scrollEnabled = YES;

Set Map not rotatable

self.mapView.rotateEnabled = NO;

Set display user's current location

Self.mapView.showsUserLocation = YES;

Set the type of map

Self.mapView.mapType = Mkmaptypestandard;

For easy testing, set the text content of the search box directly

Self.searchBar.text [email protected] "Beijing Zoo";

Self.searchBar.delegate = self;

}

Fires this method when the user clicks the Search button on the virtual keyboard

-(void) searchbarsearchbuttonclicked: (Uisearchbar *) Searchbar

{

Call the Searchbar method to search

[Self dosearch:searchbar];

}

Fires this method when the user clicks the Cancel button

Since we have redefined the appearance of the control--changing the text of the Cancel button to "search", clicking the Cancel button also performs a search

-(void) searchbarcancelbuttonclicked: (Uisearchbar *) Searchbar

{

Call the Searchbar method to search

[Self dosearch:searchbar];

}

How to perform a search

-(void) Dosearch: (Uisearchbar *) Searchbar

{

Close the Searchbar associated virtual keyboard

[Self.searchbar Resignfirstresponder];

nsstring* searchtext = Self.searchBar.text;

if (searchtext! = nil && searchtext.length > 0)

{

[Self locateat:searchtext];

}

}

This method is fired when the user enters text in the search box

-(void) searchbartextdidbeginediting: (Uisearchbar *) Searchbar

{

Show Cancel button

Searchbar.showscancelbutton = YES;

Find the Cancel button in the search box by traversing and set the text of the Cancel button to "search"

For (id cc in [searchbar.subviews[0] subviews])

{

if ([Cc Iskindofclass:[uibutton class]])

{

UIButton *button = (UIButton *) cc;

[Button settitle:@ "search" forstate:uicontrolstatenormal];

}

}

}

Converts a string address to longitude, latitude information, and performs a positioning

-(void) Locateat: (nsstring*) address

{

[Self.geocoder geocodeaddressstring:address Completionhandler:

^ (Nsarray *placemarks, Nserror *error)

{

if ([placemarks count] > 0 && error = = nil)

{

NSLog (@ "Search to match%lu address data.", (unsigned long) placemarks.count);

Process the first address

Clplacemark * Placemark = [Placemarks objectatindex:0];

NSLog (@ "longitude =:%f", placemark.location.coordinate.longitude);

NSLog (@ "latitude =:%f", placemark.location.coordinate.latitude);

NSLog (@ "country =%@", placemark.country);

NSLog (@ "postcode =%@", placemark.postalcode);

NSLog (@ "position =%@", placemark.locality);

Set the extent of the map display

Mkcoordinatespan span;

The smaller the map display, the clearer the details

Span.latitudedelta = 0.01;

Span.longitudedelta = 0.01;

Mkcoordinateregion region = {Placemark.location.coordinate,span};

Set the location of the map center to the search

[Self.mapview setregion:region]; ①

Creates a mkpointannotation that will be used as the map anchor Point

Mkpointannotation *point = [[Mkpointannotation alloc]init];

Set the coordinates of a map anchor point

Point.coordinate = placemark.location.coordinate;

Set the title of the map anchor Point

Point.title = Placemark.name;

Set the subtitle of the map anchor Point

Point.subtitle = [NSString stringwithformat:@ "%@-%@-%@-%@",

Placemark.country, Placemark.administrativearea,

Placemark.locality, placemark.sublocality];

Add a map anchor point to the map

[Self.mapview Addannotation:point];

Select the specified anchor point

[Self.mapview Selectannotation:point Animated:yes];

}

Else

{

NSLog (@ "No matching data found");

}

}];

}

Search for the specified string address