高德地图纠正CLLocationManager坐标不准的问题

最新推荐文章于 2022-08-08 22:47:25 发布

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本文介绍如何通过高德地图API实现地理位置坐标的转换，包括注册账号获取密钥、下载并配置API，以及使用CLLocationManager获取坐标后调用高德API进行坐标转换的方法。

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具体怎么做？

1、注册一个高德帐号，申请一个authKey，这个很有用。

2、下载高德API，下2.0版的。然后解压。因为我们是使用查找转换的API，所以我们只用到部份API。安装它，按照高德的文档做，不过有几点是要注意的：

(1)main.m及*AppDelegate.m必须改成.mm扩展名，因为高德使用的是objc++，不加会暴异常。
(2)只使用MASearchKit，别的都不用，不过配置过程还是要像官方文档里提出的一致。

3、下面就是使用代码，原理很简单，还是使用CLLocationManager取得坐标，不过在取得坐标之后就立即把这个会标让高德进行转换，高德会转换回一个正确的国标坐标，然后再把这个坐标添加到地图上即可：

//
//  WhereamiViewController.h
//  Whereami
//
//  Created by kut on 3/11/13.
//  Copyright (c) 2013 kut. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "MASearchKit.h"

@interface WhereamiViewController : UIViewController
    <CLLocationManagerDelegate, MKMapViewDelegate, UITextFieldDelegate, MASearchDelegate>
{
    CLLocationManager *_locationManager;
    MASearch *_chinaSearchEngine;
}

@property (weak, nonatomic) IBOutlet UITextField *ibFieldLocationTitle;
@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *ibActivityIndicator;
@property (weak, nonatomic) IBOutlet MKMapView *ibMapWorldView;


- (void)findLocation;
- (void)foundLocation:(CLLocation *)location;

@end



//
//  WhereamiViewController.mm
//  Whereami
//
//  Created by kut on 3/11/13.
//  Copyright (c) 2013 kut. All rights reserved.
//

#import "WhereamiViewController.h"
#import "BNRMapPoint.h"

@implementation WhereamiViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self)
    {
        _locationManager = [[CLLocationManager alloc] init];
        [_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
        _locationManager.delegate = self;
        _chinaSearchEngine = [[MASearch alloc] initWithSearchKey:@"your authkey"
                                                        Delegate:self];
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.ibMapWorldView.showsUserLocation = YES;
}

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations
{
    CLLocation *location = [locations lastObject];

    /// 就是这段代码，强大的高德！！
    MARGCSearchOption *option = [[MARGCSearchOption alloc] init];
    option.config = @"RGC";
    option.coors = [NSString stringWithFormat:@"%f,%f;",
                    location.coordinate.longitude,
                    location.coordinate.latitude];
    [_chinaSearchEngine gpsOffsetSearchWithOption:option];
}

- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error
{
    NSLog(@"location manager could't found location with error: %@", error);
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [self findLocation];
    [textField resignFirstResponder];
    return YES;
}

- (void)findLocation
{
    [self.ibActivityIndicator startAnimating];
    self.ibFieldLocationTitle.hidden = YES;
    [_locationManager startUpdatingLocation];
}

- (void)foundLocation:(CLLocation *)location
{
    CLLocationCoordinate2D coordinate = location.coordinate;
    BNRMapPoint *mp = [[BNRMapPoint alloc]
                       initWithCoordinate:coordinate
                       title:self.ibFieldLocationTitle.text];
    [self.ibMapWorldView addAnnotation:mp];

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coordinate, 250.0f, 250.0f);
    self.ibMapWorldView.region = region;

    [self.ibActivityIndicator stopAnimating];
    self.ibFieldLocationTitle.hidden = NO;
    self.ibFieldLocationTitle.text = @"";
    [_locationManager stopUpdatingLocation];
}

/// 这段代码就是高德转换后的回调
- (void)gpsOffsetSearch:(MARGCSearchOption *)gpsOffSearchOption
                 Result:(MARGCSearchResult *)result
{
    MARGCItem *info = [result.rgcItemArray objectAtIndex:0];
    CLLocation *location = [[CLLocation alloc] initWithLatitude:info.y.floatValue
                                                      longitude:info.x.floatValue];
    [self foundLocation:location];
}

-(NSString *)keyForSearch
{
    return nil;
}

@end