地图与定位之地图、大头针
添加框架CoreLocation、MapKit框架
一、首先了解大头针
要添加大头针需实现协议MKAnnotation ,由下图可以看到,一定要实现coordinate属性。
二、实现大头针协议
添加MyAnnotation类
#import <Foundation/Foundation.h> #import <MapKit/MapKit.h> //MKAnnotation是一个协议 ,添加大头针久需要实现该协议 //coordinate 属性是必须的,所以需要实现该属性 @interface MyAnnotation : NSObject<MKAnnotation> -(id)initWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title subtitle:(NSString *)subtitle; @end
//
// MyAnnotation.m
// MapView
//
// Created by City--Online on 15/4/20.
// Copyright (c) 2015年 CYW. All rights reserved.
//
#import "MyAnnotation.h"
@interface MyAnnotation ()
{
CLLocationCoordinate2D _coordinate;
NSString *_title;
NSString *_subTitle;
}
@end
@implementation MyAnnotation
-(id)initWithCoordinate:(CLLocationCoordinate2D)coordinate title:(NSString *)title subtitle:(NSString *)subtitle
{
if (self==[super init]) {
_coordinate=coordinate;
_title=title;
_subTitle=subtitle;
}
return self;
}
// 必选
-(CLLocationCoordinate2D)coordinate
{
return _coordinate;
}
//可选
-(NSString *)title
{
return _title;
}
-(NSString *)subtitle
{
return _subTitle;
}
@end
三、地图和添加大头针
#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#import "MyAnnotation.h"
@interface ViewController ()<CLLocationManagerDelegate,MKMapViewDelegate>
@property(nonatomic,strong)MKMapView *mapView;
@property(nonatomic,strong)CLLocationManager *locationManager;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_locationManager=[[CLLocationManager alloc]init];
BOOL enable=[CLLocationManager locationServicesEnabled];
NSLog(@"%d",[CLLocationManager authorizationStatus]);
if (!enable) {
NSLog(@"用户未开启定位服务,无法定位");
return;
}
else if ([CLLocationManager authorizationStatus]<3)
{
[_locationManager requestWhenInUseAuthorization];
}
CLLocationDistance distance=10.0;
_locationManager.distanceFilter=distance;
_locationManager.delegate=self;
_locationManager.desiredAccuracy=kCLLocationAccuracyBest;
[_locationManager startUpdatingLocation];
self.mapView=[[MKMapView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
//地图类型
// typedef NS_ENUM(NSUInteger, MKMapType) {
// MKMapTypeStandard = 0, //标准地图
// MKMapTypeSatellite, //卫星地图
// MKMapTypeHybrid //混合地图
// }
self.mapView.mapType=MKMapTypeStandard;
//是否定位当前位置 否显示当前位置
self.mapView.showsUserLocation=YES;
//代理设置
self.mapView.delegate=self;
// typedef struct {
// CLLocationCoordinate2D center;
// MKCoordinateSpan span;
// } MKCoordinateRegion;
//中心点经纬度
CLLocationCoordinate2D locationCoordinate2D;
locationCoordinate2D.latitude=22.544349;
locationCoordinate2D.longitude= 113.94787;
//范围比例尺
MKCoordinateSpan coordinateSpan;
//纬度
coordinateSpan.latitudeDelta=0.05;
//经度
coordinateSpan.longitudeDelta=0.05;
//设置显示区域
MKCoordinateRegion coordinateRegion;
coordinateRegion.center=locationCoordinate2D;
coordinateRegion.span=coordinateSpan;
[self.mapView setRegion:coordinateRegion animated:YES];
// self.mapView.region=coordinateRegion;
// typedef NS_ENUM(NSInteger, MKUserTrackingMode) {
// MKUserTrackingModeNone = 0, // the user's location is not followed
// MKUserTrackingModeFollow, // the map follows the user's location
// MKUserTrackingModeFollowWithHeading, // the map follows the user's location and heading
// }
self.mapView.userTrackingMode=MKUserTrackingModeFollow;
[self.view addSubview:self.mapView];
UISegmentedControl *segmentedControl=[[UISegmentedControl alloc]initWithItems:@[@"普通地图",@"卫星地图",@"混合地图"]];
segmentedControl.selectedSegmentIndex=0;
[segmentedControl addTarget:self action:@selector(selectSegmentIndex:) forControlEvents:UIControlEventValueChanged];
self.navigationItem.titleView=segmentedControl;
//定义大头针类
MyAnnotation *annotation=[[MyAnnotation alloc]initWithCoordinate:locationCoordinate2D title:@"主标题" subtitle:@"子标题"];
// annotation.image=[UIImage imageNamed:@"annotation.png"];
[self.mapView addAnnotation:annotation];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
if (locations.count>0) {
CLLocation *location=[locations firstObject];
CLLocationCoordinate2D locationCoordinate2D =location.coordinate;
[self.mapView setRegion:MKCoordinateRegionMake(locationCoordinate2D, self.mapView.region.span) animated:YES];
NSLog(@"%lf ,%lf",locationCoordinate2D.longitude,locationCoordinate2D.longitude);
MyAnnotation *annotation=[[MyAnnotation alloc]initWithCoordinate:locationCoordinate2D title:@"定位位置" subtitle:@"子标题"];
// annotation.image=[UIImage imageNamed:@"annotation.png"];
[self.mapView addAnnotation:annotation];
}
}
//默认返回nil,采用复用的思想
//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
{
if ([annotation isKindOfClass:[MKUserLocation class]]) {
return nil;
}
static NSString *key=@"myannotation";
MKPinAnnotationView *pinAnnotation=(MKPinAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:key];
if (!pinAnnotation) {
pinAnnotation=[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:key];
}
//动画加载
pinAnnotation.animatesDrop=true;
// typedef NS_ENUM(NSUInteger, MKPinAnnotationColor) {
// MKPinAnnotationColorRed = 0,
// MKPinAnnotationColorGreen,
// MKPinAnnotationColorPurple
// }
//大头针颜色
pinAnnotation.pinColor=MKPinAnnotationColorPurple;
//是否显示气泡(交互)
pinAnnotation.canShowCallout=true;
return pinAnnotation;
}
//大头针选中
-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
MyAnnotation *annotation=view.annotation;
NSLog(@"%@",annotation.title);
}
//定位失败
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"定位失败");
NSLog(@"%@",error);
}
- (void)selectSegmentIndex:(UISegmentedControl *)control
{
NSInteger index = control.selectedSegmentIndex;
/*
MKMapTypeStandard 普通地图(标准地图),
MKMapTypeSatellite 卫星地图,
MKMapTypeHybrid 混合地图
*/
MKMapType mapType;
switch (index)
{
//普通地图
case 0:
mapType = MKMapTypeStandard;
break;
//卫星地图
case 1:
mapType = MKMapTypeSatellite;
break;
//普通和卫星的混合地图
case 2:
mapType = MKMapTypeHybrid;
break;
default:
break;
}
//改变地图类型
self.mapView.mapType = mapType;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
四、注意
1.在info.plist中添加Key：NSLocationWhenInUseUsageDescription
2.在AppDelegate中添加导航控制器
