iOS开发系列--地图与定位源代码详解

KCMainViewController.m

//
// KCMainViewController.m
// MapKit Annotation
//
// Created by Kenshin Cui on 14/3/27.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
// 37.785834  -122.406417
// 39.92 116.39

#import "KCMainViewController.h"
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#import "KCAnnotation.h"

@interface KCMainViewController ()<MKMapViewDelegate>{
  CLLocationManager *_locationManager;
  MKMapView *_mapView;
}

@end

@implementation KCMainViewController

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

#pragma mark 添加地图控件
-(void)initGUI{
  CGRect rect=[UIScreen mainScreen].bounds;
  _mapView=[[MKMapView alloc]initWithFrame:rect];
  [self.view addSubview:_mapView];
  //设置代理
  _mapView.delegate=self;
  
  //请求定位服务
  _locationManager=[[CLLocationManager alloc]init];
  if(![CLLocationManager locationServicesEnabled]||[CLLocationManager authorizationStatus]!=kCLAuthorizationStatusAuthorizedWhenInUse){
    [_locationManager requestWhenInUseAuthorization];
  }
  
  //用户位置追踪(用户位置追踪用于标记用户当前位置，此时会调用定位服务)
  _mapView.userTrackingMode=MKUserTrackingModeFollow;
  
  //设置地图类型
  _mapView.mapType=MKMapTypeStandard;
  
  //添加大头针
  [self addAnnotation];
}

#pragma mark 添加大头针 
-(void)addAnnotation{
  CLLocationCoordinate2D location1=CLLocationCoordinate2DMake(39.95, 116.35);
  KCAnnotation *annotation1=[[KCAnnotation alloc]init];
  annotation1.title=@"CMJ Studio";
  annotation1.subtitle=@"Kenshin Cui's Studios";
  annotation1.coordinate=location1;
  annotation1.image=[UIImage imageNamed:@"icon_pin_floating.png"];
  [_mapView addAnnotation:annotation1];
  
  CLLocationCoordinate2D location2=CLLocationCoordinate2DMake(39.87, 116.35);
  KCAnnotation *annotation2=[[KCAnnotation alloc]init];
  annotation2.title=@"Kenshin&Kaoru";
  annotation2.subtitle=@"Kenshin Cui's Home";
  annotation2.coordinate=location2;
  annotation2.image=[UIImage imageNamed:@"icon_paopao_waterdrop_streetscape.png"];
  [_mapView addAnnotation:annotation2];
}

#pragma mark - 地图控件代理方法
#pragma mark 显示大头针时调用，注意方法中的annotation参数是即将显示的大头针对象
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
  //由于当前位置的标注也是一个大头针，所以此时需要判断，此代理方法返回nil使用默认大头针视图
  if ([annotation isKindOfClass:[KCAnnotation class]]) {
    static NSString *key1=@"AnnotationKey1";
    MKAnnotationView *annotationView=[_mapView dequeueReusableAnnotationViewWithIdentifier:key1];
    //如果缓存池中不存在则新建
    if (!annotationView) {
      annotationView=[[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:key1];
      annotationView.canShowCallout=true;//允许交互点击
      annotationView.calloutOffset=CGPointMake(0, 1);//定义详情视图偏移量
      annotationView.leftCalloutAccessoryView=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"icon_classify_cafe.png"]];//定义详情左侧视图
    }

    //修改大头针视图
    //重新设置此类大头针视图的大头针模型(因为有可能是从缓存池中取出来的，位置是放到缓存池时的位置)
    annotationView.annotation=annotation;
    annotationView.image=((KCAnnotation *)annotation).image;//设置大头针视图的图片
    
    return annotationView;
  }else {
    return nil;
  }
}
@end

								 
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