导入MapKit框架和设置属性

#import "ViewController.h"
#import <MapKit/MapKit.h>
@interface ViewController ()
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (weak, nonatomic) IBOutlet UITextField *addressTF;

@end

在文本输入框输入地址并点击搜索按钮,这个会调用系统自带的地图进行搜索

- (IBAction)beginNav:(id)sender
{
    // 起始点   终点 -->向苹果请求数据
    // 1.地理编码 -->获取终点的CLPlacemark
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressString:self.addressTF.text completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (error) {
            NSLog(@"%@",error);
            return ;
        }
        // 2.获取终点的CLPlacemark
        CLPlacemark *placemark = placemarks[0];
        
        // 3.转换类型
        MKPlacemark *mkPlacemark = [[MKPlacemark alloc] initWithPlacemark:placemark];
        // 4.获取终点的item
        MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:mkPlacemark];
        
        // 5.获取起始点的item
        MKMapItem *currentMapItem = [MKMapItem mapItemForCurrentLocation];
        
        /*
         MKLaunchOptionsDirectionsModeKey
         MKLaunchOptionsMapTypeKey
         MKLaunchOptionsShowsTrafficKey
         */
        NSMutableDictionary *options = [NSMutableDictionary dictionary];
        /*
         MKLaunchOptionsDirectionsModeDriving 驾车
         MKLaunchOptionsDirectionsModeWalking 步行
         MKLaunchOptionsDirectionsModeTransit 公共交通
         */
        // 导航模式
        options[MKLaunchOptionsDirectionsModeKey] = MKLaunchOptionsDirectionsModeDriving;
        // 地图类型
        options[MKLaunchOptionsMapTypeKey] = MKMapTypeStandard;
        // 是否显示交通状况
        options[MKLaunchOptionsShowsTrafficKey] = @(YES);
        // 6.打开系统自带的地图去导航
        [MKMapItem openMapsWithItems:@[currentMapItem,mapItem] launchOptions:options];
    }];
}

导航划线

#import "ViewController.h"
#import <MapKit/MapKit.h>
@interface ViewController ()<MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (weak, nonatomic) IBOutlet UITextField *addressTF;
@property (nonatomic, strong) CLLocationManager *locationManager;
@end

创建对象请求授权以及设置代理

- (void)viewDidLoad {
    [super viewDidLoad];
    // 创建对象并请求授权
    self.locationManager = [[CLLocationManager alloc] init];
    [self.locationManager requestWhenInUseAuthorization];
    // 设置代理
    self.mapView.delegate = self;
}

开始划线

// 1.地理编码  -->获取终点的mapItem
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressString:self.addressTF.text completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (error) {
            NSLog(@"%@",error);
            return ;
        }
        // 获取地标
        CLPlacemark *placemark = placemarks[0];
        // 转换类型
        MKPlacemark *mkPlacemark = [[MKPlacemark alloc] initWithPlacemark:placemark];
        // 2.终点的mapItem
        MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:mkPlacemark];
        // 3.起点的mapItem
        MKMapItem *currentMapItem = [MKMapItem mapItemForCurrentLocation];
        
        //direction :方向
        // 4.请求数据
        // 创建方向请求
        MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
        // 终点
        request.destination = mapItem;
        // 起点
        request.source = currentMapItem;
        // 创建方向对象
        MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
        // 请求数据
        [directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse * _Nullable response, NSError * _Nullable error) {
            if (error) {
                NSLog(@"error:%@",error);
                return ;
            }
            // polyline:折线
            // 5.获取数据
            for (MKRoute *route in response.routes) {
                // 获取折线
                MKPolyline *polyline = route.polyline;
                // 6.添加到地图上
                [self.mapView addOverlay:polyline];
            }
        }];
    }];

当有覆盖物添加到地图上时调用
overlay :添加的覆盖物

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
    // 创建渲染对象
    MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
    // 设置颜色
    renderer.strokeColor = [UIColor redColor];
    return renderer;
}