地圖定位

#import "ViewController.h"
#import <MapKit/MapKit.h> //地圖
#import <CoreLocation/CoreLocation.h> // 定位
@interface ViewController ()<MKMapViewDelegate>
{
    CLGeocoder *_geo;//根據經緯度，反向解析地址
}
@property (nonatomic, strong) MKMapView *mapview;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    //初始化 geo 物件
    _geo = [[CLGeocoder alloc]init];
 
    self.mapview = [[MKMapView alloc]initWithFrame:self.view.bounds];
    self.mapview.delegate = self;
    [self showPointOfLatitude:30.659462 longitude:104.065735];
    
    [self.view addSubview:self.mapview];
    
    UILongPressGestureRecognizer *gest = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)];
    [self.mapview addGestureRecognizer:gest];
}
- (void)showPointOfLatitude:(CGFloat)latitude longitude:(CGFloat)longitude{
    //中心點（結構體）
    CLLocationCoordinate2D center = {latitude,longitude};
    //縮放比例（結構體）
    MKCoordinateSpan span ;
    span.latitudeDelta = 0.005;
    span.longitudeDelta = 0.005;
    MKCoordinateRegion region = {center,span};
    //設定地圖的中心點和縮放比例 setRegion
    [self.mapview setRegion:region animated:YES];
    
#pragma mark -- 設定點的資訊
    MKPointAnnotation *anno = [[MKPointAnnotation alloc]init];
    anno.title = @"四川科技館";
    anno.subtitle = @"天府廣場附近的一點";
    anno.coordinate = center;
    //呼叫addAnnotation 方法去給地圖上加點
    [self.mapview addAnnotation:anno];
}
#pragma mark -- 點選事件
- (void)detailButtonClick:(UIButton *)sender {
    
}
//長按手勢
- (void)longPressAction:(UILongPressGestureRecognizer *)sender {
    //獲取常按點
    CGPoint point = [sender locationInView:self.mapview];
    //通過地圖方法 convertPoint： toCoordinateFromView: 把點轉換成經緯度
    CLLocationCoordinate2D coord = [self.mapview convertPoint:point toCoordinateFromView:self.mapview];
    
    //組裝CLLocation 引數
    CLLocation *location = [[CLLocation alloc]initWithLatitude:coord.latitude longitude:coord.longitude];
    
    [_geo  reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (placemarks.count > 0 && error == nil) {
            CLPlacemark *placemark = placemarks[0];
            NSArray *addArray = placemark.addressDictionary[@"FormattedAddressLines"];
            //講一個詳細的地址轉換成字串
            NSMutableString * address = [[NSMutableString alloc]init];
            for (int i = 0; i < addArray.count; i ++) {
                [address appendString: addArray[i]];
            }
            
            //設定點
            MKPointAnnotation *anno = [[MKPointAnnotation alloc]init];
            anno.title = placemark.name;
            anno.subtitle = address;
            anno.coordinate = coord;
            [self.mapview addAnnotation:anno];
            
        }
    }];
}
#pragma mark -- MKMapViewDelegate 協議方法
//自定義大頭針的方法
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
    static NSString *annoID = @"annoId";
    MKAnnotationView *annoView = [mapView dequeueReusableAnnotationViewWithIdentifier:annoID];
    if (!annoView) {
        annoView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annoID];
    }
    //設定大頭針的頭
    annoView.image = [UIImage imageNamed:@"F9F748E09B377F4B56DDFE0977FA40DE.gif"];
    //允許點選大頭針彈窗顯示詳情
    annoView.canShowCallout = YES;
    UIButton *detailButton= [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [detailButton addTarget:self action:@selector(detailButtonClick:) forControlEvents:UIControlEventTouchUpInside];
    annoView.rightCalloutAccessoryView = detailButton;
    
    
    
    //返回自定義大頭針
    return annoView;
}