//设置从天而降的动画效果
annotationView.animatesDrop = YES;

#import <UIKit/UIKit.h>
@interface AnimationAnnotationView: BMKAnnotationView
//存储每一帧图片
@property (nonatomic, strong) NSMutableArray *annotationImages;
//展示帧动画的UIImageView
@property (nonatomic, strong) UIImageView *annotationImageView;
@end 

#import "AnimationAnnotationView.h"

@implementation AnimationAnnotationView
- (id)initWithAnnotation:(id<BMKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier {
    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
    if (self) {
        [self setBounds:CGRectMake(0.f, 0.f, 32.f, 32.f)];
        [self setBackgroundColor:[UIColor clearColor]];
        _annotationImageView = [[UIImageView alloc] initWithFrame:self.bounds];
        _annotationImageView.contentMode = UIViewContentModeCenter;
        [self addSubview:_annotationImageView];
    }
    return self;
}
- (void)setAnnotationImages:(NSMutableArray *)images {
    _annotationImages = images;
    [self updateImageView];
}
- (void)updateImageView {
    if ([_annotationImageView isAnimating]) {
        [_annotationImageView stopAnimating];
    }
    _annotationImageView.animationImages = _annotationImages;
    _annotationImageView.animationDuration = 0.5 * [_annotationImages count];
    _annotationImageView.animationRepeatCount = 0;
    [_annotationImageView startAnimating];
}

@end

//初始化标注类BMKPointAnnotation的实例
BMKPointAnnotation *annotation = [[BMKPointAnnotation alloc] init];
//设置标注的经纬度坐标
annotation.coordinate = CLLocationCoordinate2DMake(39.915, 116.404);
/**
 向地图窗口添加标注，需要实现BMKMapViewDelegate的-mapView:viewForAnnotation:方法
 来生成标注对应的View

 @param annotation 要添加的标注
 */
[_mapView addAnnotation:annotation];

#pragma mark - BMKMapViewDelegate

/**

 根据anntation生成对应的annotationView

 @param mapView 地图View
 @param annotation 指定的标注
 @return 生成的标注View
 */

- (BMKAnnotationView *)mapView:(BMKMapView *)mapView viewForAnnotation:(id <BMKAnnotation>)annotation {

    //动画annotation
    NSString *AnnotationViewID = @"AnimatedAnnotation";
    AnimationAnnotationView *annotationView = nil;
    if (annotationView == nil) {
        annotationView = [[AnimationAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID];
    }
    NSMutableArray *images = [NSMutableArray array];
    for (int i = 1; i < 4; i++) {
        UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"poi-%d.png", i]];
        [images addObject:image];
    }
    annotationView.annotationImages = images;
    return annotationView;

}