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//
//  ViewController.m
//  ios自带地图笔记
//
//  Created by 王木木 on 15/12/3.
//
/*
 导入<MapKit/MapKit.h>    <CoreLocation/CoreLocation.h>  两个库
 引用地图前  尽量用真机测试  模拟器的话  等程序运行起来之后点击  xcode下方的  位置图片按钮标识  便可
 需在info.plist中追加NSLocationWhenInUseUsageDescription或NSLocationAlwaysUsageDescription字段.其中：
 NSLocationWhenInUseUsageDescription表示应用在前台的时候可以搜到更新的位置信息。
 NSLocationAlwaysUsageDescription表示应用在前台和后台（suspend或terminated)都可以获取到更新的位置数据。
 
 
 */
#import "ViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController ()<MKMapViewDelegate,CLLocationManagerDelegate>
{
    MKMapView *_mapView;
    CLLocationManager *locationManager;
    CLLocation *location;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    _mapView =[[MKMapView alloc]initWithFrame:self.view.bounds];
    _mapView.zoomEnabled = YES;
    _mapView.showsUserLocation = YES;
    _mapView.scrollEnabled = YES;
    _mapView.delegate = self;
    [self.view addSubview:_mapView];
    if([[UIDevice currentDevice].systemVersion floatValue] > 8.0f)
    {
        [self getUserLocation];
    }
     // 长按手势  长按添加大头针
    UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(lpgrClick:)];
    [_mapView addGestureRecognizer:lpgr];
    
}
//获取当前位置
- (void)getUserLocation
{
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    //kCLLocationAccuracyBest:设备使用电池供电时候最高的精度
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    locationManager.distanceFilter = 50.0f;
    if (([[[UIDevice currentDevice] systemVersion] doubleValue] >= 8.0))
    {
        [locationManager requestAlwaysAuthorization];
    }
    //更新位置
    [locationManager startUpdatingLocation];
}
#pragma mark-CLLocationManagerDelegate  位置更新后的回调
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    //停止位置更新
    [locationManager stopUpdatingLocation];
    
    CLLocation *loc = [locations firstObject];
    CLLocationCoordinate2D theCoordinate;
    //位置更新后的经纬度
    theCoordinate.latitude = loc.coordinate.latitude;
    theCoordinate.longitude = loc.coordinate.longitude;
    //设定显示范围
    MKCoordinateSpan theSpan;
    theSpan.latitudeDelta=0.01;
    theSpan.longitudeDelta=0.01;
    //设置地图显示的中心及范围
    MKCoordinateRegion theRegion;
    theRegion.center=theCoordinate;
    theRegion.span=theSpan;
    [_mapView setRegion:theRegion];
    location = [locations lastObject];
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
   
    [geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *array, NSError *error)
     {
         CLGeocoder *geocoder = [[CLGeocoder alloc] init];
         [geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *array, NSError *error) {
             
             if (array.count > 0)
             {
                 CLPlacemark *placemark = [array objectAtIndex:0];
                 // 将获得的所有信息显示到label上
                 NSLog(@"%@",placemark.administrativeArea);
                 // 获取城市
                 NSString *city = placemark.administrativeArea;
                 if (!city) {
                     // 四大直辖市的城市信息无法通过locality获得，只能通过获取省份的方法来获得（如果city为空，则可知为直辖市）
                     city = placemark.administrativeArea;
                 }
                 NSLog(@"当前城市:%@",city);
                 // 设置地图显示的类型及根据范围进行显示  安放大头针
                 MKPointAnnotation *pinAnnotation = [[MKPointAnnotation alloc] init];
                 pinAnnotation.coordinate = theCoordinate;
                 pinAnnotation.title = city;
                 [_mapView addAnnotation:pinAnnotation];
             }
             else if (error == nil && [array count] == 0)
             {
                 NSLog(@"No results were returned.");
             }
             else if (error != nil)
             {
                 NSLog(@"An error occurred = %@", error);
             }
         
             
         }];
         
     }];
}

// 每次添加大头针都会调用此方法  可以设置大头针的样式
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
    // 判断大头针位置是否在原点,如果是则不加大头针
    if([annotation isKindOfClass:[mapView.userLocation class]])
        return nil;
    static NSString *annotationName = @"annotation";
    MKPinAnnotationView *anView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationName];
    if(anView == nil)
    {
        anView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:annotationName];
    }
    anView.animatesDrop = YES;
    //    // 显示详细信息
    anView.canShowCallout = YES;
//    anView.leftCalloutAccessoryView   可以设置左视图
//    anView.rightCalloutAccessoryView   可以设置右视图
    return anView;
}

//长按添加大头针事件
- (void)lpgrClick:(UILongPressGestureRecognizer *)lpgr
{
    // 判断只在长按的起始点下落大头针
    if(lpgr.state == UIGestureRecognizerStateBegan)
    {
        // 首先获取点
        CGPoint point = [lpgr locationInView:_mapView];
        // 将一个点转化为经纬度坐标
        CLLocationCoordinate2D center = [_mapView convertPoint:point toCoordinateFromView:_mapView];
        MKPointAnnotation *pinAnnotation = [[MKPointAnnotation alloc] init];
        pinAnnotation.coordinate = center;
        pinAnnotation.title = @"长按";
        [_mapView addAnnotation:pinAnnotation];
    }
}

//计算两个位置之间的距离
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    NSLog(@"%@",error);
}

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



@end