MapKit 以及大头针的简单使用

给一个简单事例注释很详细了应该不许要过多的解释了

//
//  ViewController.m
//  2014_11_03_大头针的使用
//
//  Created by Mac10.9 on 14-11-3.
//  Copyright (c) 2014年 xiaoxiaobing. All rights reserved.
//

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

#import "XXBAnnotation.h"

@interface ViewController ()<CLLocationManagerDelegate , MKMapViewDelegate>

@property (strong, nonatomic) CLLocationManager *locMgr;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupCLLocationManager];
    [self setupMapView];
}

/**
 *  懒加载
 */
- (CLLocationManager *)locMgr
{
    if(![CLLocationManager locationServicesEnabled])
    {
        /**
         只有系统的定位功能是关闭的时候才会调用这个方法
         */
        return nil;
    }
   
    if (!_locMgr)
    {
        // 创建定位管理者
        self.locMgr = [[CLLocationManager alloc] init];
        // 设置代理
        self.locMgr.delegate = self;
    }
    return _locMgr;
}

- (void)setupCLLocationManager
{
    // 开始定位用户的位置
    [self.locMgr requestAlwaysAuthorization];
    [self.locMgr startUpdatingLocation];
   
}

- (void)setupMapView
{
   
    // 1.跟踪用户位置(显示用户的具体位置)
    self.mapView.userTrackingMode = MKUserTrackingModeFollow;
   
    // 2.设置代理
    self.mapView.delegate = self;
   
    // 3.监听mapView的点击事件
    [self.mapView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapMapView:)]];
}

- (void)tapMapView:(UITapGestureRecognizer *)tap
{
   
    // 1.获得用户在mapView点击的位置（x，y）
    CGPoint point = [tap locationInView:tap.view];
   
    // 2.将数学坐标 转为 地理经纬度坐标
    CLLocationCoordinate2D coordinate = [self.mapView convertPoint:point toCoordinateFromView:self.mapView];
   
    // 3.创建大头针模型，添加大头针到地图上
    XXBAnnotation *anno = [[XXBAnnotation alloc] init];
    anno.coordinate = coordinate;
    anno.title = @"小小兵";
    anno.subtitle = @"小小兵的地盘";
    [self.mapView addAnnotation:anno];
   
    // 纬度范围：N 3°51′ ~  N 53°33′
    // 经度范围：E 73°33′ ~  E 135°05′
   
    for (int i = 0; i<1000; i++) {
        XXBAnnotation *anno = [[XXBAnnotation alloc] init];
        CLLocationDegrees latitude = 4 + arc4random_uniform(50);
        CLLocationDegrees longitude = 73 + arc4random_uniform(60);
        anno.coordinate = CLLocationCoordinate2DMake(latitude, longitude);
        anno.title = @"小小兵";
        anno.subtitle = @"小小兵的地盘";
        [self.mapView addAnnotation:anno];
    }
}

#pragma mark - MKMapViewDelegate
/**
 *  当用户的位置更新，就会调用（不断地监控用户的位置，调用频率特别高）
 *
 *  @param userLocation 表示地图上蓝色那颗大头针的数据
 */

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    userLocation.title = @"天朝帝都";
    userLocation.subtitle = @"是个非常牛逼的地方！";
   
    CLLocationCoordinate2D center = userLocation.location.coordinate;
    NSLog(@"%f %f", center.latitude, center.longitude);
   
    // 设置地图的中心点（以用户所在的位置为中心点）
    [mapView setCenterCoordinate:userLocation.location.coordinate animated:YES];
   
    // 设置地图的显示范围
    MKCoordinateSpan span = MKCoordinateSpanMake(0.021321, 0.019366);
    MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
    [mapView setRegion:region animated:YES];
}
/**
 *  当地图的范围发生改变的时候会调用这个方法
 */
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    /**
     *  输出当前的地图的范围
     * latitudeDelta 维度
     * longitudeDelta 经度
     */
    NSLog(@"%f %f", mapView.region.span.latitudeDelta, mapView.region.span.longitudeDelta);
}

/**
 *  让用户的地点跑到屏幕中间
 */
- (IBAction)backToUserLocation:(UIButton *)sender{
    [self.mapView setCenterCoordinate:self.mapView.userLocation.location.coordinate animated:YES];
}
@end