遇到一个需求，给出起点和终点的位置，需要在地图中展示出来，并有导航功能。
首先需要把位置转化成经纬度，这个可以使用系统提供的方法，需要引入框架#import <MapKit/MapKit.h>，
// address为具体地址名称
NSString *address;
[myGeocoder geocodeAddressString:oreillyAddress completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
if ([placemarks count] > 0 && error == nil) {
CLPlacemark *firstPlacemark = [placemarks objectAtIndex:0];
// coord即为得到到坐标
CLLocationCoordinate2D coord;
coord.latitude = firstPlacemark.location.coordinate.latitude;
coord.longitude = firstPlacemark.location.coordinate.longitude;
// 由于项目中使用到是百度地图，需要把坐标转化为百度地图到坐标
CLLocationCoordinate2D baiduCoor;
baiduCoor = [self changeBaiDuGPS:coord];
} else if ([placemarks count] == 0 && error == nil) {
NSLog(@"Found no placemarks.");
} else if (error != nil) {
NSLog(@"An error occurred = %@", error);
}
}];
// 坐标转化方法
- (CLLocationCoordinate2D)changeBaiDuGPS:(CLLocationCoordinate2D)coor {
//转换国测局坐标（google地图、soso地图、aliyun地图、mapabc地图和amap地图所用坐标）至百度坐标
NSDictionary* testdic = BMKConvertBaiduCoorFrom(coor,BMK_COORDTYPE_COMMON);
//转换后的百度坐标
CLLocationCoordinate2D baiduCoor = BMKCoorDictionaryDecode(testdic);
return baiduCoor;
}
同样通过上面的方法可以得到起始点的坐标和终点的坐标，把坐标展示到地图上：
startPoint = [[BMKPointAnnotation alloc] init];
startPoint.coordinate = startCoor;
[_mapView addAnnotation:startPoint];
endPoint = [[BMKPointAnnotation alloc] init];
endPoint.coordinate = endCoor;
[_mapView addAnnotation:endPoint];
大头针已经添加到地图上了，下面需要自定义大头针的样式，需要添加百度地图代理_mapView.delegate = self;：
// BMKMapViewDelegate
- (BMKAnnotationView *)mapView:(BMKMapView *)mapView viewForAnnotation:(id<BMKAnnotation>)annotation {
if (annotation == startPoint) {
NSString *AnnotationViewID = @"renameMark";
BMKAnnotationView *annotationView = (BMKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
annotationView.frame = CGRectMake(0, 0, 30, 30);
if (annotationView == nil) {
annotationView = [[BMKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID];
annotationView.image = [UIImage imageNamed:@"map_start"];
}
return annotationView;
} else if (annotation == endPoint) {
NSString *AnnotationViewID = @"renameMark";
BMKAnnotationView *annotationView = (BMKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
annotationView.frame = CGRectMake(0, 0, 30, 30);
if (annotationView == nil) {
annotationView = [[BMKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID];
annotationView.image = [UIImage imageNamed:@"map_end"];
}
return annotationView;
}
return nil;
}
自定义大头针样式
页面展示基本上完成了，导航功能需要跳转到相应app就可以，目前我只做了跳转到百度地图和系统自带地图，跳转相应app需要在plist文件中设置
plist文件设置相应选项
跳转选项使用
UIAlertController
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alertController addAction:[UIAlertAction actionWithTitle:@"使用苹果地图" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self jumpAppleMap];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"使用百度地图" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[self jumpBaiduMap];
}]];
[alertController addAction: [UIAlertAction actionWithTitle: @"取消" style: UIAlertActionStyleCancel handler:nil]];
[self presentViewController: alertController animated: YES completion: nil];
跳转到苹果地图，此时使用的坐标为系统根据文字转换的坐标，不必使用百度地图的坐标:
- (void)jumpAppleMap {
MKMapItem *startLocation = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithCoordinate:iosStartCoor addressDictionary:nil]];
MKMapItem *toLocation = [[MKMapItem alloc] initWithPlacemark:[[MKPlacemark alloc] initWithCoordinate:iosEndCoor addressDictionary:nil]];
[MKMapItem openMapsWithItems:@[startLocation, toLocation] launchOptions:@{MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving, MKLaunchOptionsShowsTrafficKey: [NSNumber numberWithBool:YES]}];
}
跳转到百度地图，此时需要使用转化后的百度地图坐标:
- (void)jumpBaiduMap {
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"baidumap://map/"]]) {
NSString *urlString = [NSString stringWithFormat:@"baidumap://map/direction?origin=%f,%f&destination=%f,%f&&mode=driving",startCoor.latitude,startCoor.longitude,endCoor.latitude,endCoor.longitude];
NSURL *url = [NSURL URLWithString:urlString];
[[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
} else {
// 没有安装百度地图，无法打开
}
}
这样程序便会跳转到相应APP，并进入到导航功能。
