iOS高德地图一些问题

打开地图需要有搜索周边的需求，但是
mapView:didUpdateUserLocation:updatingLocation:
方法调用了很多次，导致数据一直在刷新，不断搜索，及其容易引起崩溃，处理方法为，判断userlocation.location.horizontalAccuracy(水平精度)

- (void)mapView:(MAMapView *)mapView didUpdateUserLocation:(MAUserLocation *)userLocation updatingLocation:(BOOL)updatingLocation {
    if (updatingLocation) {
        CLLocation *newLocation = userLocation.location;
        //判断时间,定位时间是否正确
        NSTimeInterval locationAge = [newLocation.timestamp timeIntervalSinceNow];
        NSLog(@"%f",locationAge);
        if (locationAge > 5.0) {
            return;
        }
        //判断水平精度
        if (!self.isLoacating) {
            if (newLocation.horizontalAccuracy>0 && newLocation.horizontalAccuracy<150) {
                NSLog(@"111222");
                CLLocationCoordinate2D myCoorDinate = [newLocation coordinate];
                self.mapView.centerCoordinate = myCoorDinate;
                self.isLoacating = YES;
                [self searchNearBy];
            }
        }
    }
}

参考链接：
iOS高德地图开发【一】