百度地图的路径规划功能，
在使用百度路径的时候，出现了一些小问题，在此，分享一下自己的最简单的一个路径小demo
当然，前面的百度配置问题，我就不和大家讲了，因为这方面的资料太多了！现在，我来介绍一下这个小demo

AppDelegate.m文件如下，

#import "AppDelegate.h"

import “rootViewController.h”

@implementation AppDelegate

• (BOOL)application:(UIApplication )application didFinishLaunchingWithOptions:(NSDictionary )launchOptions
  {
  self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

  self.window.backgroundColor = [UIColor whiteColor];

  mapManager = [[BMKMapManager alloc]init];
  // 如果要关注网络及授权验证事件，请设定 generalDelegate参数
  BOOL ret = [mapManager start:@“6Gp5e6XYGQn5aRRD1DK0vKCf” generalDelegate:nil];
  if (!ret) {

  NSLog(@"manager start failed!");

  }

  rootViewController *rootVC = [[rootViewController alloc] init];
  navigationController = [[UINavigationController alloc] initWithRootViewController:rootVC];
  self.window.rootViewController = navigationController;

  [self.window makeKeyAndVisible];
  return YES;

}

然后，rootViewController.m文件如下，这里只有步行这个按钮有效果哦！

#import "rootViewController.h"

import “BMapKit.h”

define MYBUNDLE_NAME @ “mapapi.bundle”

define MYBUNDLE_PATH [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: MYBUNDLE_NAME]

define MYBUNDLE [NSBundle bundleWithPath: MYBUNDLE_PATH]

@interface RouteAnnotation : BMKPointAnnotation
{

int _type; ///<0:起点 1：终点 2：公交 3：地铁 4:驾乘 5:途经点
int _degree;

}

@property (nonatomic) int type;
@property (nonatomic) int degree;
@end

@implementation RouteAnnotation

@synthesize type = type;
@synthesize degree = degree;
@end

@interface rootViewController ()
{

UITextField *textFrom;
UITextField *textTo;

UIButton *btnBus;
UIButton *btnCar;
UIButton *btnfoot;
UIView *_mapV ;

BMKMapView* _mapView;
BMKRouteSearch* _routesearch;

}

@end

@implementation UIImage(InternalMethod)

• (UIImage*)imageRotatedByDegrees:(CGFloat)degrees
  {

  CGFloat width = CGImageGetWidth(self.CGImage);
  CGFloat height = CGImageGetHeight(self.CGImage);

  CGSize rotatedSize;

  rotatedSize.width = width;
  rotatedSize.height = height;

  UIGraphicsBeginImageContext(rotatedSize);
  CGContextRef bitmap = UIGraphicsGetCurrentContext();
  CGContextTranslateCTM(bitmap, rotatedSize.width/2, rotatedSize.height/2);
  CGContextRotateCTM(bitmap, degrees * M_PI / 180);
  CGContextRotateCTM(bitmap, M_PI);
  CGContextScaleCTM(bitmap, -1.0, 1.0);
  CGContextDrawImage(bitmap, CGRectMake(-rotatedSize.width/2, -rotatedSize.height/2, rotatedSize.width, rotatedSize.height), self.CGImage);
  UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return newImage;
  }

@end

@interface rootViewController ()

@end

@implementation rootViewController

• (NSString)getMyBundlePath1:(NSString )filename
  {

  NSBundle * libBundle = MYBUNDLE ;
  if ( libBundle && filename ){

  NSString * s=[[libBundle resourcePath ] stringByAppendingPathComponent : filename];
  return s;

  }
  return nil ;
  }

• (id)initWithNibName:(NSString )nibNameOrNil bundle:(NSBundle )nibBundleOrNil
  {
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self) {

  // Custom initialization
  self.view.backgroundColor = [UIColor redColor];

  }
  return self;
  }

• (void)viewDidLoad
  {
  [super viewDidLoad];
  // Do any additional setup after loading the view.
  self.title = @“路径规划”;

  [self setUpUI];

  textFrom.text = @“天安门”;
  textTo.text = @“百度大厦”;

  routesearch = [[BMKRouteSearch alloc]init];
  routesearch.delegate = self;// 此处记得不用的时候需要置nil，否则影响内存的释放
  mapView = [[BMKMapView alloc]initWithFrame:mapV.bounds];
  mapView.delegate = self; // 此处记得不用的时候需要置nil，否则影响内存的释放
  [mapV addSubview:_mapView];

}

-(void)setUpUI
{

UILabel *lableFrom = [[UILabel alloc] initWithFrame:CGRectMake(20,70, 60, 30)];
lableFrom.text = @"起点";

UILabel *lableTo = [[UILabel alloc] initWithFrame:CGRectMake(20,120, 60, 30)];
lableTo.text = @"终点";

textFrom = [[UITextField alloc] initWithFrame:CGRectMake(100, 70, 80, 30)];
textFrom.backgroundColor = [UIColor greenColor];

textTo = [[UITextField alloc] initWithFrame:CGRectMake(100, 120, 80, 30)];
textTo.backgroundColor = [UIColor greenColor];


btnBus = [[UIButton alloc] initWithFrame:CGRectMake(20, 160, 40, 30)];
[btnBus setTitle:@"公交" forState:UIControlStateNormal];
btnCar = [[UIButton alloc] initWithFrame:CGRectMake(80, 160, 40, 30)];
[btnCar setTitle:@"驾车" forState:UIControlStateNormal];
btnfoot = [[UIButton alloc] initWithFrame:CGRectMake(150, 160, 40, 30)];
[btnfoot setTitle:@"步行" forState:UIControlStateNormal];
[btnfoot addTarget:self action:@selector(walkBtnClick) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview: lableFrom];
[self.view addSubview: lableTo];
[self.view addSubview: textFrom];
[self.view addSubview: textTo];
[self.view addSubview: btnBus];
[self.view addSubview: btnCar];
[self.view addSubview: btnfoot];

CGFloat height = [UIScreen mainScreen].bounds.size.height - CGRectGetMaxY(btnBus.frame) ;

_mapV = [[UIView alloc] initWithFrame:CGRectMake(0,   CGRectGetMaxY(btnBus.frame), 320, height)];
_mapV.backgroundColor = [UIColor whiteColor];
[self.view addSubview:_mapV];

}

-(void)walkBtnClick
{

BMKPlanNode* start = [[BMKPlanNode alloc]init] ;
start.name = textFrom.text;
start.cityName = @"北京市";
BMKPlanNode* end = [[BMKPlanNode alloc]init];
end.name = textTo.text;
end.cityName = @"北京市";

BMKWalkingRoutePlanOption *walkingRouteSearchOption = [[BMKWalkingRoutePlanOption alloc]init];
walkingRouteSearchOption.from = start;
walkingRouteSearchOption.to = end;

NSLog(@"%@------%@",start.name,end.name);

BOOL flag = [_routesearch walkingSearch:walkingRouteSearchOption];
if(flag)
{
    NSLog(@"walk检索发送成功");
}
else
{
    NSLog(@"walk检索发送失败");
}

}

• (void)onGetWalkingRouteResult:(BMKRouteSearch)searcher result:(BMKWalkingRouteResult)result errorCode:(BMKSearchErrorCode)error
  {
  NSArray* array = [NSArray arrayWithArray:mapView.annotations];
  [mapView removeAnnotations:array];
  array = [NSArray arrayWithArray:mapView.overlays];
  [mapView removeOverlays:array];
  if (error == BMK_SEARCH_NO_ERROR) {

  BMKWalkingRouteLine* plan = (BMKWalkingRouteLine*)[result.routes objectAtIndex:0];
  int size = [plan.steps count];
  int planPointCounts = 0;
  for (int i = 0; i < size; i++) {
      BMKWalkingStep* transitStep = [plan.steps objectAtIndex:i];
      if(i==0){
          RouteAnnotation* item = [[RouteAnnotation alloc]init];
          item.coordinate = plan.starting.location;
          item.title = @"起点";
          item.type = 0;
          [_mapView addAnnotation:item]; // 添加起点标注
  
      }else if(i==size-1){
          RouteAnnotation* item = [[RouteAnnotation alloc]init];
          item.coordinate = plan.terminal.location;
          item.title = @"终点";
          item.type = 1;
          [_mapView addAnnotation:item]; // 添加起点标注
  
      }
      //添加annotation节点
      RouteAnnotation* item = [[RouteAnnotation alloc]init];
      item.coordinate = transitStep.entrace.location;
      item.title = transitStep.entraceInstruction;
      item.degree = transitStep.direction * 30;
      item.type = 4;
      [_mapView addAnnotation:item];
  
      //轨迹点总数累计
      planPointCounts += transitStep.pointsCount;
  }
  
  //轨迹点
  BMKMapPoint * temppoints = new BMKMapPoint[planPointCounts];
  int i = 0;
  for (int j = 0; j < size; j++) {
      BMKWalkingStep* transitStep = [plan.steps objectAtIndex:j];
      int k=0;
      for(k=0;k<transitStep.pointsCount;k++) {
          temppoints[i].x = transitStep.points[k].x;
          temppoints[i].y = transitStep.points[k].y;
          i++;
      }
  }
  // 通过points构建BMKPolyline
  BMKPolyline* polyLine = [BMKPolyline polylineWithPoints:temppoints count:planPointCounts];
  [_mapView addOverlay:polyLine]; // 添加路线overlay
  delete []temppoints;

  }

}

• (BMKOverlayView)mapView:(BMKMapView )map viewForOverlay:(id )overlay
  {
  if ([overlay isKindOfClass:[BMKPolyline class]]) {

  BMKPolylineView* polylineView = [[BMKPolylineView alloc] initWithOverlay:overlay];
  polylineView.fillColor = [[UIColor cyanColor] colorWithAlphaComponent:1];
  polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7];
  polylineView.lineWidth = 3.0;
  return polylineView;

  }
  return nil;
  }

pragma mark -这里是换大头针的把！

• (BMKAnnotationView)getRouteAnnotationView:(BMKMapView )mapview viewForAnnotation:(RouteAnnotation)routeAnnotation
  {
  BMKAnnotationView view = nil;
  switch (routeAnnotation.type) {

  case 0:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"start_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"start_node"] ;
          view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_start.png"]];
          view.centerOffset = CGPointMake(0, -(view.frame.size.height * 0.5));
          view.canShowCallout = TRUE;
      }
      view.annotation = routeAnnotation;
  }
      break;
  case 1:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"end_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"end_node"] ;
          view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_end.png"]];
          view.centerOffset = CGPointMake(0, -(view.frame.size.height * 0.5));
          view.canShowCallout = TRUE;
      }
      view.annotation = routeAnnotation;
  }
      break;
  case 2:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"bus_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"bus_node"] ;
          view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_bus.png"]];
          view.canShowCallout = TRUE;
      }
      view.annotation = routeAnnotation;
  }
      break;
  case 3:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"rail_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"rail_node"] ;
          view.image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_rail.png"]];
          view.canShowCallout = TRUE;
      }
      view.annotation = routeAnnotation;
  }
      break;
  case 4:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"route_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"route_node"] ;
          view.canShowCallout = TRUE;
      } else {
          [view setNeedsDisplay];
      }
  
      UIImage* image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_direction.png"]];
      view.image = [image imageRotatedByDegrees:routeAnnotation.degree];
      view.annotation = routeAnnotation;
  
  }
      break;
  case 5:
  {
      view = [mapview dequeueReusableAnnotationViewWithIdentifier:@"waypoint_node"];
      if (view == nil) {
          view = [[BMKAnnotationView alloc]initWithAnnotation:routeAnnotation reuseIdentifier:@"waypoint_node"] ;
          view.canShowCallout = TRUE;
      } else {
          [view setNeedsDisplay];
      }
  
      UIImage* image = [UIImage imageWithContentsOfFile:[self getMyBundlePath1:@"images/icon_nav_waypoint.png"]];
      view.image = [image imageRotatedByDegrees:routeAnnotation.degree];
      view.annotation = routeAnnotation;
  }
      break;
  default:
      break;

  }

  return view;
  }

• (BMKAnnotationView )mapView:(BMKMapView )view viewForAnnotation:(id )annotation
  {
  if ([annotation isKindOfClass:[RouteAnnotation class]]) {

  return [self getRouteAnnotationView:view viewForAnnotation:(RouteAnnotation*)annotation];

  }
  return nil;
  }

• (void)didReceiveMemoryWarning
  {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
  }
  @end

而 _routesearch.delegate = self;在设置代理的时候，使用的是BMKRouteSearch百度api中的代理，而此代理必须先实现了代理方法才能设置代理（一般我们些的代理方法，并不需要先遵守哦！）而且我们使用的是arc，所以，这行代码会报错！必须把代理属性设置为weak才行哦！

其它基本上没有什么错误了哈，其它不会可以参考官方demo哦！

ios百度地图-路径规划