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