I am trying to figure out how to add an instance of MKAnnotation to a MKMapView. I can't figure out what I am doing wrong...everything seems to go fine until I actually try and add the annotation to the mapView. Then I receive a SIGABRT error. Here is my code:
我试图弄清楚如何将MKAnnotation的实例添加到MKMapView。我无法弄清楚我做错了什么......一切似乎都没问题，直到我真的尝试将注释添加到mapView。然后我收到SIGABRT错误。这是我的代码：
lon = [[attributeDict objectForKey:@"long"] doubleValue];
lat = [[attributeDict objectForKey:@"lat"] doubleValue];
MKPointAnnotation *point;
CLLocation *theLocation = [[CLLocation alloc]initWithLatitude:lat longitude:lon];
CLLocationCoordinate2D location;
location.latitude = lat;
location.longitude = lon;
[point setCoordinate:(location)];
[point setTitle:businessName];
//ITS RIGHT HERE THAT I GET THE ERROR
[theMap addAnnotation:point];
Do you have to set the region of the map first or something?
你必须首先设置地图的区域吗？
1 个解决方案
#1
14
You need to alloc and init point:
你需要alloc和init point：
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];
#1
14
You need to alloc and init point:
你需要alloc和init point：
MKPointAnnotation *point = [[MKPointAnnotation alloc] init];