iOS开发之离线地图核心代码

#import <UIKit/UIKit.h>#import <CoreLocation/CoreLocation.h>#import "MapLocation.h"@interface ViewController : UIViewController<MKMapViewDelegate>{  MKMapView *_mapView;  NSString *addressString;}@end 

 #import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  // Do any additional setup after loading the view.  //调用系统自带的高德地图  //显示当前某地的离线地图  _mapView = [[MKMapView alloc] init];  _mapView.frame = CGRectMake(0, 40, 320,400);  _mapView.delegate = self;  _mapView.mapType = MKMapTypeStandard;  [self.view addSubview:_mapView];  addressString=@"光启城";  NSLog(@"---addressString---%@",addressString);  [self geocodeQuery];}- (void)geocodeQuery{  if (addressString == nil || [addressString length] == 0) {    return;  }  CLGeocoder *geocoder = [[CLGeocoder alloc] init];  [geocoder geocodeAddressString:addressString completionHandler:^(NSArray *placemarks, NSError *error) {    NSLog(@"查询记录数：%ld",[placemarks count]);    if ([placemarks count] > 0) {      [_mapView removeAnnotations:_mapView.annotations];    }    for (int i = 0; i < [placemarks count]; i++) {      CLPlacemark* placemark = placemarks[i];      //调整地图位置和缩放比例      MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 10000, 10000);      [_mapView setRegion:viewRegion animated:YES];      MapLocation *annotation = [[MapLocation alloc] init];      annotation.streetAddress = placemark.thoroughfare;      annotation.city = placemark.locality;      annotation.state = placemark.administrativeArea;      annotation.zip = placemark.postalCode;      annotation.coordinate = placemark.location.coordinate;      [_mapView addAnnotation:annotation];    }  }];}#pragma mark Map View Delegate Methods- (MKAnnotationView *) mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>) annotation {  MKPinAnnotationView *annotationView  = (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOTATION"];  if(annotationView == nil) {    annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation                             reuseIdentifier:@"PIN_ANNOTATION"];  }  annotationView.pinColor = MKPinAnnotationColorPurple;  annotationView.animatesDrop = YES;  annotationView.canShowCallout = YES;  return annotationView;}- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation{  _mapView.centerCoordinate = userLocation.location.coordinate;}- (void)mapViewDidFailLoadingMap:(MKMapView *)theMapView withError:(NSError *)error {  NSLog(@"error : %@",[error description]);}@end 

#import <MapKit/MapKit.h>@interface MapLocation : NSObject<MKAnnotation>//街道信息属性@property (nonatomic, copy) NSString *streetAddress;//城市信息属性@property (nonatomic, copy) NSString *city;//州、省、市信息@property (nonatomic, copy) NSString *state;//邮编@property (nonatomic, copy) NSString *zip;//地理坐标@property (nonatomic, readwrite) CLLocationCoordinate2D coordinate;@end 

//地图调用函数#import "MapLocation.h"@implementation MapLocation- (NSString *)title {  return @"您的位置!";}- (NSString *)subtitle {  NSMutableString *ret = [NSMutableString new];  if (_state)    [ret appendString:_state];  if (_city)    [ret appendString:_city];  if (_city && _state)    [ret appendString:@", "];  if (_streetAddress && (_city || _state || _zip))    [ret appendString:@" • "];  if (_streetAddress)    [ret appendString:_streetAddress];  if (_zip)    [ret appendFormat:@", %@", _zip];  return ret;}@end