iOS开发MapKit地图两点之间的距离及线路的绘制

//建一个model类
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface MyAnnotation : NSObject<MKAnnotation>
@property (nonatomic ,assign) CLLocationCoordinate2D coordinate;
@property (nonatomic,copy)NSString *myTitle;
@property (nonatomic,copy)NSString *mySubtitle;

- (id)initWithCoordinate2D:(CLLocationCoordinate2D)coordinate;
@end

#import "MyAnnotation.h"
@implementation MyAnnotation
- (id)initWithCoordinate2D:(CLLocationCoordinate2D)coordinate
{
if (self = [super init]) {
_coordinate = coordinate;
}
return self;
}
- (NSString *)title
{
return _myTitle;
}
- (NSString *)subtitle
{
return _mySubtitle;
}
@end

#import "KYViewController.h"
#import <MapKit/MapKit.h>
#import "MyAnnotation.h"

@interface KYViewController ()<MKMapViewDelegate, CLLocationManagerDelegate, UITextFieldDelegate>
{
CLLocationManager *locationManager;
//2点之间的线路
CLLocationCoordinate2D fromCoordinate;
CLLocationCoordinate2D toCoordinate;
//计算2点之间的距离
CLLocation *newLocation;
CLLocation *oldLocation;
IBOutlet UILabel *titlelabel;
}
@property (weak, nonatomic) IBOutlet UITextField *txtQueryKey;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@end

@implementation KYViewController

- (void)viewWillAppear:(BOOL)animated
{
//开始定位
[locationManager startUpdatingLocation];
_txtQueryKey.delegate = self;

}

- (void)viewWillDisappear:(BOOL)animated
{
_mapView.delegate = nil;
locationManager.delegate = nil;
_txtQueryKey.delegate = nil;
//停止定位
[locationManager stopUpdatingLocation];
}

- (void)viewDidLoad
{
[super viewDidLoad];
//初始化地图
[self initWithMapView];
//初始化定位服务管理对象
[self initWithLocationManager];

}

- (void)initWithMapView
{
//设置地图类型
_mapView.mapType = MKMapTypeStandard;
//设置代理
_mapView.delegate = self;
//开启自动定位
_mapView.showsUserLocation = YES;
[_mapView setUserTrackingMode:(MKUserTrackingModeFollow) animated:YES];
}
- (void)initWithLocationManager
{
//初始化定位服务管理对象
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
[locationManager requestAlwaysAuthorization];
//设置精确度
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
//设置设备移动后获取位置信息的最小距离。单位为米
locationManager.distanceFilter = 10.0f;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[_txtQueryKey resignFirstResponder];
return YES;
}

//位置的实时更新
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{

fromCoordinate = CLLocationCoordinate2DMake(userLocation.location.coordinate.latitude,userLocation.location.coordinate.longitude);
_mapView.centerCoordinate = userLocation.location.coordinate;
//    CLLocationCoordinate2D center = userLocation.location.coordinate;
//    MKCoordinateSpan span = MKCoordinateSpanMake(0.021321, 0.019366);//这个显示大小精度自己调整
//    MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
//    [mapView setRegion:region animated:YES];

CLLocation *locNow = [[CLLocation alloc]initWithLatitude:userLocation.location.coordinate.latitude longitude:userLocation.location.coordinate.longitude];
CLGeocoder *geocoder=[[CLGeocoder alloc] init];
[geocoder reverseGeocodeLocation:locNow completionHandler:^(NSArray *placemarks,NSError *error)
{
CLPlacemark *placemark=[placemarks objectAtIndex:0];
oldLocation = placemark.location;
CLLocationCoordinate2D coordinate;
coordinate.latitude = userLocation.location.coordinate.latitude;
coordinate.longitude = userLocation.location.coordinate.longitude;
MyAnnotation *annotation = [[MyAnnotation alloc] init];
//设置中心
annotation.coordinate = coordinate;
//触发viewForAnnotation

//设置显示范围
MKCoordinateRegion region;
region.span.latitudeDelta = 0.011111;
region.span.longitudeDelta = 0.011111;
region.center = coordinate;
// 设置显示位置(动画)
[_mapView setRegion:region animated:YES];
// 设置地图显示的类型及根据范围进行显示
[_mapView regionThatFits:region];
_mapView.showsUserLocation = NO;
annotation.myTitle = @"我的位置";
annotation.mySubtitle = [NSString stringWithFormat:@"%@, %@, %@",placemark.locality,placemark.administrativeArea,placemark.thoroughfare];
annotation.coordinate = placemark.location.coordinate;
[_mapView addAnnotation:annotation];
}];

}

//计算2点之间的距离
- (IBAction)calculationDistance:(id)sender {

CGFloat distance = [newLocation distanceFromLocation:oldLocation];
NSLog(@"distance = %f", distance);
titlelabel.text = [NSString stringWithFormat:@"%f米", distance];
}

//线路的绘制
- (IBAction)lineDrawing:(id)sender {

MKPlacemark *fromPlacemark = [[MKPlacemark alloc] initWithCoordinate:fromCoordinate addressDictionary:nil];
MKPlacemark *toPlacemark = [[MKPlacemark alloc] initWithCoordinate:toCoordinate addressDictionary:nil];
MKMapItem *fromItem = [[MKMapItem alloc] initWithPlacemark:fromPlacemark];
MKMapItem *toItem = [[MKMapItem alloc] initWithPlacemark:toPlacemark];
MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
request.source = fromItem;
request.destination = toItem;
request.requestsAlternateRoutes = YES;
MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:
^(MKDirectionsResponse *response, NSError *error) {
if (error) {
NSLog(@"error:%@", error);
}
else {
MKRoute *route = response.routes[0];
[self.mapView addOverlay:route.polyline];
}
}];

}
//线路的绘制
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView
rendererForOverlay:(id<MKOverlay>)overlay
{
MKPolylineRenderer *renderer;
renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
renderer.lineWidth = 5.0;
renderer.strokeColor = [UIColor purpleColor];

return renderer;
}

//地理信息编码查询
- (IBAction)handleButtonAction:(id)sender {

_mapView.showsUserLocation = NO;
if (_txtQueryKey.text == nil || _txtQueryKey.text.length == 0) {
return;
}
//地理信息编码查询
CLGeocoder *geocder = [[CLGeocoder alloc] init];
[geocder geocodeAddressString:_txtQueryKey.text completionHandler:^(NSArray *placemarks, NSError *error) {

if (placemarks.count > 0){
CLPlacemark *placemark = placemarks[0];
newLocation = placemark.location;
toCoordinate = CLLocationCoordinate2DMake(placemark.location.coordinate.latitude,placemark.location.coordinate.longitude);
//调整地图位置和缩放比例
//第一个参数指定目标区域的中心点，第二个参数是目标区域的南北跨度，单位为米。第三个参数为目标区域东西跨度，单位为米。后2个参数的调整会影响地图的缩放
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 600, 600);
//重新设置地图视图的显示区域
[_mapView setRegion:viewRegion animated:YES];
//实例化MyAnnotation对象
MyAnnotation *annotation = [[MyAnnotation alloc] init];
//将地标CLPlacemark对象取出，放入到MyAnnotation对象中
annotation.myTitle = placemark.locality;
annotation.mySubtitle = [NSString stringWithFormat:@"%@, %@, %@",placemark.locality,placemark.administrativeArea,placemark.thoroughfare];
annotation.coordinate = placemark.location.coordinate;

//把标注点MyAnnotation对象添加到地图上
[_mapView addAnnotation:annotation];
//关闭键盘
[_txtQueryKey resignFirstResponder];
}

}];

}

//在地图视图添加标注时回调
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(MyAnnotation *)annotation
{
MKPinAnnotationView *ann = (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:@"ID"];
if (ann == nil) {
ann = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"ID"];
}
ann.pinColor = MKPinAnnotationColorPurple;
ann.animatesDrop = YES;
ann.canShowCallout = YES;

return ann;
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
switch (status) {
case kCLAuthorizationStatusNotDetermined:
if ([locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
[locationManager requestWhenInUseAuthorization];
}
break;
default:
break;
}
}

@end