iOS地图集成示例：百度地图POI检索

#import "ViewController.h"
@interface ViewController ()<BMKMapViewDelegate,BMKPoiSearchDelegate>
@property(nonatomic,weak)BMKMapView * mapView;
@property(nonatomic,weak)UITextField * tf;
@property(nonatomic,strong)BMKPoiSearch * poisearch;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //设置地图
    BMKMapView* mapView = [[BMKMapView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];
    self.mapView = mapView;
    [self.view addSubview:mapView];
    
    
    //设置开始查找按钮和输入文本框
    UIButton * btn = [[UIButton alloc]initWithFrame:CGRectMake(30, 30, 100, 30)];
    [btn setTitle:@"开始查找" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    [btn setBackgroundColor:[UIColor orangeColor]];
    [self.view addSubview:btn];
    
    UITextField * tf = [[UITextField alloc]initWithFrame:CGRectMake(150, 30, 100, 30)];
    self.tf= tf;
    tf.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:tf];
    
    
    //实例POI检索化检索对象，并设置代理
    
    self.poisearch = [[BMKPoiSearch alloc]init];
    self.poisearch.delegate = self;
    

}


-(void)btnClick :(UIButton *)btn
{

    //检索参数
    BMKCitySearchOption *citySearchOption = [[BMKCitySearchOption alloc]init];
    citySearchOption.pageIndex = 0; //当前页码
    citySearchOption.pageCapacity = 20; //每页个数
    citySearchOption.city= @"北京"; //城市
    citySearchOption.keyword = self.tf.text; //关键字 酒店
    
    //根据检索参数，进行检索，并返回检索结果的标识
    BOOL flag = [_poisearch poiSearchInCity:citySearchOption];
    if(flag)
    {
        NSLog(@"城市内检索发送成功");
    }
    else
    {
        NSLog(@"城市内检索发送失败");
    }
}


#pragma mark implement BMKSearchDelegate
- (void)onGetPoiResult:(BMKPoiSearch *)searcher result:(BMKPoiResult*)result errorCode:(BMKSearchErrorCode)error
{
    // 清除屏幕中所有的annotation
    NSArray* array = [NSArray arrayWithArray:_mapView.annotations];
    [_mapView removeAnnotations:array];
    //正确
    if (error == BMK_SEARCH_NO_ERROR) {
        NSMutableArray *annotations = [NSMutableArray array];
        //遍历返回的查询结果
        for (int i = 0; i < result.poiInfoList.count; i++) {
            BMKPoiInfo* poi = [result.poiInfoList objectAtIndex:i];
            BMKPointAnnotation* item = [[BMKPointAnnotation alloc]init];
            item.coordinate = poi.pt;
            item.title = poi.name;
            [annotations addObject:item];
        }
        
        //给地图添加大头针模型
        [_mapView addAnnotations:annotations];
        [_mapView showAnnotations:annotations animated:YES];
        
        
    } else if (error == BMK_SEARCH_AMBIGUOUS_ROURE_ADDR){
        NSLog(@"起始点有歧义");
    } else {
        // 各种情况的判断。。。
    }
}



#pragma mark implement BMKMapViewDelegate

/**
 *根据anntation生成对应的View
 *@param mapView 地图View
 *@param annotation 指定的标注
 *@return 生成的标注View
 */
- (BMKAnnotationView *)mapView:(BMKMapView *)view viewForAnnotation:(id <BMKAnnotation>)annotation
{
    // 生成重用标示identifier
    NSString *AnnotationViewID = @"xidanMark";
    
    // 检查是否有重用的缓存
    BMKAnnotationView* annotationView = [view dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
    
    // 缓存没有，自己构造一个，一般首次添加annotation代码会运行到此处
    if (annotationView == nil) {
        annotationView = [[BMKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID];
        ((BMKPinAnnotationView*)annotationView).pinColor = BMKPinAnnotationColorRed;
        // 设置重天上掉下的效果(annotation)
        ((BMKPinAnnotationView*)annotationView).animatesDrop = YES;
    }
    
    // 设置位置
    annotationView.centerOffset = CGPointMake(0, -(annotationView.frame.size.height * 0.5));
    annotationView.annotation = annotation;
    // 单击弹出泡泡，弹出泡泡前提annotation必须实现title属性
    annotationView.canShowCallout = YES;
    // 设置是否可以拖拽
    annotationView.draggable = NO;
    
    return annotationView;
}


-(void)viewWillAppear:(BOOL)animated
{
    [_mapView viewWillAppear];
    _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
}
-(void)viewWillDisappear:(BOOL)animated
{
    [_mapView viewWillDisappear];
    _mapView.delegate = nil; // 不用时，置nil
}

@end