浏览路线

按照本指南中的说明，使用 Navigation SDK for iOS 在应用中绘制到单个目的地的路线。

概览

1. 将 Navigation SDK 集成到您的应用中，如设置项目部分所述。
2. 配置 GMSMapView。
3. 提示用户接受条款及条件，并授权使用位置信息服务和后台通知。
4. 创建一个包含一个或多个目的地的数组。

5. 定义 GMSNavigator 以控制精细导航。

   • 使用 setDestinations 添加目的地。
   • 将 isGuidanceActive 设为 true 以开始导航。
   • 使用 simulateLocationsAlongExistingRoute 模拟车辆沿路线的进度，以便测试、调试和演示应用。

注意： 为防止屏幕在导航时调暗或关闭，您的应用必须停用空闲计时器，因为 Navigation SDK 不会为您执行此操作。如需停用空闲计时器，请进行以下调用：
[UIApplication sharedApplication].idleTimerDisabled = YES;。

查看代码

显示/隐藏导航视图控制器的 Swift 代码。

/*
 * Copyright 2017 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import GoogleNavigation
import UIKit

class ViewController: UIViewController {

  var mapView: GMSMapView!
  var locationManager: CLLocationManager!

  override func loadView() {

    locationManager = CLLocationManager()

    // Set up the map view.
    let camera = GMSCameraPosition.camera(withLatitude: 47.67, longitude: -122.20, zoom: 14)
    mapView = GMSMapView.map(withFrame: .zero, camera: camera)

    // Show the terms and conditions.
    let companyName = "Ride Sharing Co."
    GMSNavigationServices.showTermsAndConditionsDialogIfNeeded(
      withCompanyName: companyName
    ) { termsAccepted in
      if termsAccepted {
        // Enable navigation if the user accepts the terms.
        self.mapView.isNavigationEnabled = true
        self.mapView.settings.compassButton = true

        // Request authorization to use location services.
        self.locationManager.requestAlwaysAuthorization()

        // Request authorization for alert notifications which deliver guidance instructions
        // in the background.
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert]) {
          granted, error in
          // Handle denied authorization to display notifications.
          if !granted || error != nil {
            print("User rejected request to display notifications.")
          }
        }
      } else {
        // Handle rejection of terms and conditions.
      }
    }

    view = mapView

    makeButton()
  }

  // Create a route and start guidance.
  func startNav() {
    var destinations = [GMSNavigationWaypoint]()
    destinations.append(
      GMSNavigationWaypoint.init(
        placeID: "ChIJnUYTpNASkFQR_gSty5kyoUk",
        title: "PCC Natural Market")!)
    destinations.append(
      GMSNavigationWaypoint.init(
        placeID: "ChIJJ326ROcSkFQRBfUzOL2DSbo",
        title: "Marina Park")!)

    mapView.navigator?.setDestinations(
      destinations
    ) { routeStatus in
      guard routeStatus == .OK else {
        print("Handle route statuses that are not OK.")
        return
      }
      self.mapView.navigator?.isGuidanceActive = true
      self.mapView.locationSimulator?.simulateLocationsAlongExistingRoute()
      self.mapView.cameraMode = .following
    }
  }

  // Add a button to the view.
  func makeButton() {
    // A button to start navigation.
    let navButton = UIButton(frame: CGRect(x: 5, y: 150, width: 200, height: 35))
    navButton.backgroundColor = .blue
    navButton.alpha = 0.5
    navButton.setTitle("Start navigation", for: .normal)
    navButton.addTarget(self, action: #selector(startNav), for: .touchUpInside)
    self.mapView.addSubview(navButton)
  }

}

显示/隐藏导航视图控制器的 Objective-C 代码。

/*
 * Copyright 2017 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "ViewController.h"
@import GoogleNavigation;

@interface ViewController ()
@end

@implementation ViewController {
  GMSMapView *_mapView;
  CLLocationManager *_locationManager;
}

- (void)loadView {

  _locationManager = [[CLLocationManager alloc] init];

  // Set up the map view.
  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:47.67
                                                          longitude:-122.20
                                                               zoom:14];
  _mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];

  // Show the terms and conditions.
  NSString *companyName = @"Ride Sharing Co.";
  [GMSNavigationServices
    showTermsAndConditionsDialogIfNeededWithCompanyName:companyName
                                               callback:^(BOOL termsAccepted) {
     if (termsAccepted) {
       // Enable navigation if the user accepts the terms.
       _mapView.navigationEnabled = YES;
       _mapView.settings.compassButton = YES;

       // Request authorization to use the current device location.
       [_locationManager requestAlwaysAuthorization];

       // Request authorization for alert notifications which deliver guidance instructions
       // in the background.
       UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
       UNAuthorizationOptions options = UNAuthorizationOptionAlert;
       [center requestAuthorizationWithOptions:options
                             completionHandler:^(BOOL granted, NSError *_Nullable error) {
                               if (!error && granted) {
                                 NSLog(@"iOS Notification Permission: newly Granted");
                               } else {
                                 NSLog(@"iOS Notification Permission: Failed or Denied");
                               }
                             }];
     } else {
       // Handle rejection of the terms and conditions.
     }
   }];

  self.view = _mapView;

  [self makeButton];
}

// Create a route and initiate navigation.
- (void)startNav {
  NSArray<GMSNavigationWaypoint *> *destinations =
  @[[[GMSNavigationWaypoint alloc] initWithPlaceID:@"ChIJnUYTpNASkFQR_gSty5kyoUk"
                                             title:@"PCC Natural Market"],
    [[GMSNavigationWaypoint alloc] initWithPlaceID:@"ChIJJ326ROcSkFQRBfUzOL2DSbo"
                                             title:@"Marina Park"]];

  [_mapView.navigator setDestinations:destinations
                             callback:^(GMSRouteStatus routeStatus){
                               [_mapView.locationSimulator simulateLocationsAlongExistingRoute];
                               _mapView.navigator.guidanceActive = YES;
                               _mapView.navigator.sendsBackgroundNotifications = YES;
                               _mapView.cameraMode = GMSNavigationCameraModeFollowing;
                             }];
}

// Add a button to the view.
- (void)makeButton {
  // A button to start navigation.
  UIButton *navButton = [UIButton buttonWithType:UIButtonTypeCustom];
  [navButton addTarget:self
                action:@selector(startNav)
      forControlEvents:UIControlEventTouchUpInside];
  [navButton setTitle:@"Navigate" forState:UIControlStateNormal];
  [navButton setBackgroundColor:[UIColor blueColor]];
  navButton.frame = CGRectMake(5.0, 150.0, 100.0, 35.0);
  [_mapView addSubview:navButton];
}

@end

提示用户授予必要的授权

在使用 Navigation SDK 之前，用户必须同意条款及条件，并授权使用位置信息服务（这是导航所必需的）。如果您的应用将在后台运行，则还必须提示用户授权接收引导提醒通知。本部分介绍了如何显示所需的授权提示。

授权使用位置信息服务

Navigation SDK 使用位置信息服务，这需要用户授权。如需启用位置信息服务并显示授权对话框，请按以下步骤操作：

1. 将 NSLocationAlwaysUsageDescription 键添加到 Info.plist。

2. 对于值，请简要说明您的应用为何需要位置信息服务。例如：“此应用需要权限才能使用位置信息服务提供精细导航。”

3. 如需显示授权对话框，请调用位置信息管理器实例的 requestAlwaysAuthorization()。

SwiftObjective-C

self.locationManager.requestAlwaysAuthorization()

[_locationManager requestAlwaysAuthorization];

为后台引导功能授权提醒通知

Navigation SDK 需要用户权限才能在应用在后台运行时提供提醒通知。添加以下代码，以提示用户授予显示这些通知的权限：

SwiftObjective-C

UNUserNotificationCenter.current().requestAuthorization(options: [.alert]) {
  granted, error in
    // Handle denied authorization to display notifications.
    if !granted || error != nil {
      print("User rejected request to display notifications.")
    }
}

// Request authorization for alert notifications.
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
UNAuthorizationOptions options = UNAuthorizationOptionAlert;
[center requestAuthorizationWithOptions:options
                      completionHandler:
 ^(
   BOOL granted,
   NSError *_Nullable error) {
     if (!error && granted) {
       NSLog(@"iOS Notification Permission: newly Granted");
     } else {
       NSLog(@"iOS Notification Permission: Failed or Denied");
     }
   }];

接受相关条款及条件

使用以下代码显示条款及条件对话框，并在用户接受条款后启用导航。请注意，此示例包含位置信息服务和导航提醒通知的代码（如前所示）。

SwiftObjective-C

  let termsAndConditionsOptions = GMSNavigationTermsAndConditionsOptions(companyName: "Ride Sharing Co.")

  GMSNavigationServices.showTermsAndConditionsDialogIfNeeded(
    with: termsAndConditionsOptions) { termsAccepted in
    if termsAccepted {
      // Enable navigation if the user accepts the terms.
      self.mapView.isNavigationEnabled = true
      self.mapView.settings.compassButton = true

      // Request authorization to use location services.
      self.locationManager.requestAlwaysAuthorization()

      // Request authorization for alert notifications which deliver guidance instructions
      // in the background.
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert]) {
      granted, error in
        // Handle rejection of notification authorization.
        if !granted || error != nil {
          print("Authorization to deliver notifications was rejected.")
        }
      }
    } else {
      // Handle rejection of terms and conditions.
    }
  }

GMSNavigationTermsAndConditionsOptions *termsAndConditionsOptions = [[GMSNavigationTermsAndConditionsOptions alloc] initWithCompanyName:@"Ride Sharing Co."];

[GMSNavigationServices
  showTermsAndConditionsDialogIfNeededWithOptions:termsAndConditionsOptions
  callback:^(BOOL termsAccepted) {
   if (termsAccepted) {
     // Enable navigation if the user accepts the terms.
     _mapView.navigationEnabled = YES;
     _mapView.settings.compassButton = YES;

     // Request authorization to use the current device location.
     [_locationManager requestAlwaysAuthorization];

     // Request authorization for alert notifications which deliver guidance instructions
     // in the background.
     UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
     UNAuthorizationOptions options = UNAuthorizationOptionAlert;
     [center requestAuthorizationWithOptions:options
                           completionHandler:
     ^(
       BOOL granted,
       NSError *_Nullable error) {
         if (!error && granted) {
           NSLog(@"iOS Notification Permission: newly Granted");
         } else {
           NSLog(@"iOS Notification Permission: Failed or Denied");
         }
       }];
   } else {
     // Handle rejection of the terms and conditions.
   }
 }];

创建路线并开始导航

如需绘制路线，请使用包含要访问的一个或多个目的地 (GMSNavigationWaypoint) 的数组调用 Navigator 的 setDestinations() 方法。如果计算成功，路线会显示在地图上。如需开始沿路线导航（从第一个目的地开始），请在回调中将 isGuidanceActive 设置为 true。

下例显示了：

• 创建包含两个目的地的新路线。
• 开始使用指南。
• 启用后台引导通知。
• 模拟沿路线行驶（可选）。
• 将相机模式设置为“跟随”（可选）。

SwiftObjective-C

func startNav() {
  var destinations = [GMSNavigationWaypoint]()
  destinations.append(GMSNavigationWaypoint.init(placeID: "ChIJnUYTpNASkFQR_gSty5kyoUk",
                                                 title: "PCC Natural Market")!)
  destinations.append(GMSNavigationWaypoint.init(placeID:"ChIJJ326ROcSkFQRBfUzOL2DSbo",
                                                 title:"Marina Park")!)

  mapView.navigator?.setDestinations(destinations) { routeStatus in
    self.mapView.navigator?.isGuidanceActive = true
    self.mapView.locationSimulator?.simulateLocationsAlongExistingRoute()
    self.mapView.cameraMode = .following
  }
}

- (void)startNav {
  NSArray<GMSNavigationWaypoint *> *destinations =
  @[[[GMSNavigationWaypoint alloc] initWithPlaceID:@"ChIJnUYTpNASkFQR_gSty5kyoUk"
                                             title:@"PCC Natural Market"],
    [[GMSNavigationWaypoint alloc] initWithPlaceID:@"ChIJJ326ROcSkFQRBfUzOL2DSbo"
                                             title:@"Marina Park"]];

  [_mapView.navigator setDestinations:destinations
                             callback:^(GMSRouteStatus routeStatus){
                               [_mapView.locationSimulator simulateLocationsAlongExistingRoute];
                               _mapView.navigator.guidanceActive = YES;
                               _mapView.cameraMode = GMSNavigationCameraModeFollowing;
                             }];
}

如需了解地点 ID，请参阅地点 ID。

设置出行方式

出行模式决定了系统将提取哪种类型的路线，以及确定用户行程的方式。您可以为路线设置四种出行方式之一：驾车、骑车、步行和出租车。在驾车和出租车模式下，用户的航向取决于行进方向；在骑车和步行模式下，航向由设备朝向表示。

设置地图视图的 travelMode 属性，如以下示例所示：

SwiftObjective-C

self.mapView.travelMode = .cycling

_mapView.travelMode = GMSNavigationTravelModeCycling;

设置要避开的道路

使用 avoidsHighways 和 avoidsTolls BOOL 属性可避开路线上的高速公路和/或收费公路。

SwiftObjective-C

self.mapView.navigator?.avoidsTolls = true

_mapView.navigator.avoidsTolls = YES;

地点 ID 查找工具

您可以使用地点 ID 查找工具查找要用作路线目的地的地点 ID。使用 GMSNavigationWaypoint 从 placeID 添加目的地。

浮动文本

您可以在应用中的任何位置添加浮动文本，前提是不会遮盖 Google 提供方说明。Navigation SDK 不支持将文本锚定到地图上的经纬度或标签。如需了解详情，请参阅信息窗口。