ios8系统地图定位问题解决

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苹果公司在更新了IOS8系统之后，对系统地图的定位方式做了较大变动，导致之前的定位代码无法正常使用，研究了很长时间，终于解决了，废话不多说了，直奔主题。

一、首先确保所用到的framework全部导入了：MapKit.framework（mapview使用），CoreLocation.framework（定位使用）；

二、plist文件里面添加值：NSLocationAlwaysUsageDescription和NSLocationWhenInUseDescription，设成YES（两个值前后最好不要出现空格）；

三、代码：首先声明两个代理：CLLocationManagerDelegate和MKMapViewDelegate；

创建地图：（ViewWidth是宏定义，获取屏幕的宽度）

 _mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 64, ViewWidth, self.view.bounds.size.height - 64)]; _mapView.mapType = MKMapTypeStandard; _mapView.zoomEnabled = YES;    _mapView.showsUserLocation=YES; _mapView.delegate = self;    [self.view addSubview:_mapView];

设置地图默认的放大倍数：（调节0.001两个值，1为原始大小）

    MKCoordinateSpan theSpan;    //地图的范围 越小越精确    theSpan.latitudeDelta = 0.001;    theSpan.longitudeDelta = 0.001;    MKCoordinateRegion theRegion;    theRegion.center = [[_locationManager location] coordinate];    theRegion.span = theSpan;    [_mapView setRegion:theRegion];

定位方法：

<span style="font-size:14px;">- (void)startLocating{    if([CLLocationManager locationServicesEnabled])    {        _locationManager = [[CLLocationManager alloc] init];        //设置定位的精度        [_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];         _locationManager.distanceFilter = 100.0f;        _locationManager.delegate = self;        if ([[[UIDevice currentDevice] systemVersion] floatValue] > 8.0)        {            [_locationManager requestAlwaysAuthorization];            [_locationManager requestWhenInUseAuthorization];        }        //开始实时定位        [_locationManager startUpdatingLocation];            }} - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{    CLLocation *location = [locations lastObject];    //CLLocationCoordinate2D coordinate = location.coordinate;    CLGeocoder *geocoder = [[CLGeocoder alloc] init];    [geocoder reverseGeocodeLocation:location                   completionHandler:^(NSArray *placemarks, NSError *error){                                              if (error)                       {                           NSLog(@"location is error");                       }                       NSString *city;                       NSString *province;                       for (CLPlacemark *place in placemarks)                       {                                                      city = [place.addressDictionary objectForKey:@"City"];                           province = [place.addressDictionary objectForKey:@"State"];                           if(!city)                           {                               city = province;                           }                           if (!province)                           {                               province = city;                           }                           [[NSUserDefaults standardUserDefaults]setObject:province forKey:@"Province"];                           [[NSUserDefaults standardUserDefaults]setObject:city forKey:@"City"];                       }                                          }];    [_locationManager stopUpdatingLocation];} -(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{       NSLog(@"经度====%f",manager.location.coordinate.longitude);         NSLog(@"纬度=====%f",manager.location.coordinate.latitude);            NSString *strLat = [NSString stringWithFormat:@"%f",manager.location.coordinate.latitude];    NSString *strLng = [NSString stringWithFormat:@"%f",manager.location.coordinate.longitude];        _locationStr = [NSString stringWithFormat:@"%f,%f",[strLng doubleValue],[strLat doubleValue]];        CLLocationCoordinate2D coords = CLLocationCoordinate2DMake([strLat doubleValue],[strLng doubleValue]);        [_mapView setCenterCoordinate:coords animated:YES];        CLGeocoder *geocoder=[[CLGeocoder alloc]init];    [geocoder reverseGeocodeLocation:manager.location completionHandler:^(NSArray *placemark,NSError *error)     {         CLPlacemark *mark=[placemark objectAtIndex:0];                  NSString *str = [NSString stringWithFormat:@"%@",mark];                  str = [[str componentsSeparatedByString:@"<"] objectAtIndex:0];         _label.text = str;              } ];        [_locationManager stopUpdatingLocation];    }</span>

第一个方法在ViewdidLoad中直接调用就行，第二个方法是获取到省和市，第三个方法中，manager.location，就是定位到得经纬度了，如代码所示，可以输出具体的值查看，

<span style="font-size:14px;"> CLLocationCoordinate2D coords = CLLocationCoordinate2DMake([strLat doubleValue],[strLng doubleValue]);        [_mapView setCenterCoordinate:coords animated:YES];</span>

是将地图显示到当前定位的位置。有了经纬度，就可以拿到当前具体的位置信息了：

<span style="font-size:14px;">CLGeocoder *geocoder=[[CLGeocoder alloc]init];    [geocoder reverseGeocodeLocation:manager.location completionHandler:^(NSArray *placemark,NSError *error)     {         CLPlacemark *mark=[placemark objectAtIndex:0];                  NSString *str = [NSString stringWithFormat:@"%@",mark];                  str = [[str componentsSeparatedByString:@"<"] objectAtIndex:0];         _label.text = str;              } ];</span>

反编码拿到位置信息，就可以用label来显示了，到此，ios8的定位问题也就解决了。。

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