基于LBS平台的iOS开发

LBS,即Location Based Services,基于位置服务，用于定位、导航等功能，比如地图应用、订外卖等的app就需要这个功能。

在这里我使用的是高德LBS开放平台，地址：http://lbs.amap.com/

进入网站，首先注册并认证为开发者，然后为你的每个APP申请一个key,其中安全码（Bundle Identifier）通过Xcode切换到General标签，查看Bundle Identifier。

使用第三方服务，我们可以使用自动配置，这里就要使用到Cocoapods。CocoaPods是一个用来帮助我们管理第三方依赖库的工具。它可以解决库与库之间的依赖关系，下载库的源代码，同时通过创建一个Xcode的workspace来将这些第三方库和我们的工程连接起来，供我们开发使用。使用CocoaPods的目的是让我们能自动化的、集中的、直观的管理第三方开源库。

如果需要升级ruby,使用homebrew安装：brew install ruby

另外一种方法升级ruby: sudo gem update --system 

安装Cocoapods教程：

gem sources -l
gem sources --remove https://rubygems.org/
gem sources -a https://ruby.taobao.org/
gem sources -l
sudo gem install -n /usr/local/bin cocoapods
pod setup

创建Podfile:

cd /project
touch Podfile

或者直接cd到工程目录，然后pod init ，在Podfile里直接添加也行。

编辑Podfile文件：

source 'https://github.com/CocoaPods/Specs.git'
platform:ios,'7.0' #手机系统
#pod 'AMap3DMap' #3D地图SDK
pod 'AMap2DMap' #2D地图SDK(2D和3D不能同时使用)
pod 'AMapSearch' #搜索服务SDK

以下是额外补充
#platform :ios  
#pod 'Reachability',  '~> 3.0.0'  
#pod 'SBJson', '~> 4.0.0'  

#platform :ios, '7.0'  
#pod 'AFNetworking', '~> 2.0'  

标准格式：

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!
target 'AlamofireDemo' do
pod 'Alamofire'
pod 'SwiftyJSON'
end

然后到工程目录，输入命令pod  install，如果出现-bash: pod: command not found，输入sudo gem install -n /usr/local/bin cocoapods即可解决。

如果如果pod update / pod install 卡在：Updating local specs repositories，

等待即可，或者可以使用 “pod install --verbose --no-repo-update” 进行下载。

更新：如果你又添加新的三方库，可以在Podfile文件中继续添加，然后再终端输入pod update,然后CocoaPods就会重新帮你导入.

然后通过打开xcworkspace文件打开安装有cocoapods的工程

以下是我Controller.m的核心代码，仅供参考：

#import "ViewController.h"
#import <MAMapKit/MAMapKit.h>
#import <AMapSearchKit/AMapSearchAPI.h>
#define APIKey @"你申请的key"

@interface ViewController ()<MAMapViewDelegate,AMapSearchDelegate>
{
    MAMapView *_mapView;
    AMapSearchAPI *_search;
    CLLocation *_currentLocation;
    UIButton *_locationButton;
}

@end

@implementation ViewController

- (void)initControls
{
    _locationButton = [UIButton buttonWithType:UIButtonTypeCustom];
    _locationButton.frame = CGRectMake(20, CGRectGetHeight(_mapView.bounds)-80,40,40);
    _locationButton.autoresizingMask = UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin;
    _locationButton.backgroundColor = [UIColor whiteColor];
    _locationButton.layer.cornerRadius = 5;
    [_locationButton addTarget:self action:@selector(locateAction) forControlEvents:UIControlEventTouchUpInside];
    [_locationButton setImage:[UIImage imageNamed:@"location_no"] forState:UIControlStateNormal];
    [_mapView addSubview:_locationButton];
    
}
//搜索服务
- (void)initSearch
{
    _search = [[AMapSearchAPI alloc]initWithSearchKey:APIKey Delegate:self];
}

//修改用户定位模式
- (void)locateAction
{
    if (_mapView.userTrackingMode != MAUserTrackingModeFollow) {
        [_mapView setUserTrackingMode:MAUserTrackingModeFollow animated:YES];
    }
}
//地理编码搜索请求
- (void)reGeoAction
{
    if(_currentLocation)
    {
        AMapReGeocodeSearchRequest *request = [[AMapReGeocodeSearchRequest alloc]init];
        request.location = [AMapGeoPoint locationWithLatitude:_currentLocation.coordinate.latitude longitude:_currentLocation.coordinate.longitude];
        [_search AMapGeocodeSearch:request];
    }
}

- (void)searchRequest:(id)request didFailWithError:(NSError *)error
{
    NSLog(@"request :%@, error :%@",request,error);
}
- (void)onReGeocodeSearchDone:(AMapGeocodeSearchRequest *)request response:(AMapReGeocodeSearchResponse *)response
{
    NSLog(@"response :%@",response);
    NSString *title = response.regeocode.addressComponent.city;
    if (title.length == 0) {
        title = response.regeocode.addressComponent.province;
    }
    _mapView.userLocation.title = title;
    _mapView.userLocation.subtitle = response.regeocode.formattedAddress;
}

//用户代理方法
- (void)mapView:(MAMapView *)mapView didChangeUserTrackingMode:(MAUserTrackingMode)mode animated:(BOOL)animated
{
    //修改定位按钮状态
    if(mode == MAUserTrackingModeNone)
    {
        [_locationButton setImage:[UIImage imageNamed:@"location_no"] forState:UIControlStateNormal];
    }
    else{
        [_locationButton setImage:[UIImage imageNamed:@"location_yes"] forState:UIControlStateNormal];
    }
}

//记录当前所在位置
- (void)mapView:(MAMapView *)mapView didUpdateUserLocation:(MAUserLocation *)userLocation updatingLocation:(BOOL)updatingLocation
{
    NSLog(@"userLocation: %@",userLocation.location);
    _currentLocation = [userLocation.location copy];
    
}

- (void)mapView:(MAMapView *)mapView didSelectAnnotationView:(MAAnnotationView *)view
{
    //选中定位annotation的时候进行逆地理编码查询
    if ([view.annotation isKindOfClass:[MAUserLocation class]])
    {
        [self reGeoAction];
    }
}


//初始化地图
- (void)initMapView
{
    [MAMapServices sharedServices].apiKey = APIKey;
    _mapView = [[MAMapView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds))];
    //设置地图的代理和两个附件的位置
    _mapView.delegate = self;
    _mapView.compassOrigin = CGPointMake(_mapView.compassOrigin.x, 22);
    _mapView.scaleOrigin = CGPointMake(_mapView.scaleOrigin.x, 22);
    [self.view addSubview:_mapView];
    //打开用户定位
    _mapView.showsUserLocation = YES;
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self initMapView];
    [self initSearch];
    [self initControls];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

运行结果：

如果你有更多的API接口想要实现，你可以去高德LBS开放平台去看看开发文档，可以作进一步深入和开发。

github地址：https://github.com/AbelSu131/HelloAmap