xcode – 尝试在Pin上居中地图(MKMapView)

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苦苦寻找一种方法来使地图缩放并以注释引脚为中心. Pin下降,但地图加载海洋.代码如下.
  1. - (void) connectionDidFinishLoading:(NSURLConnection *)connection
  2. {
  3. [self setString];
  4.  
  5. NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:nil];
  6. NSDictionary *location = [dic objectForKey:@"location"];
  7. NSDictionary *coordinate = [location objectForKey:@"coordinate"];
  8. NSString *lat = [coordinate objectForKey:@"latitude"];
  9. NSString *lon = [coordinate objectForKey:@"longitude"];
  10.  
  11. for (NSDictionary *diction in coordinate)
  12. {
  13. [array addObject:lat];
  14. [array addObject:lon];
  15. }
  16. {
  17. CLLocationCoordinate2D track;
  18. track.latitude = [lat doubleValue];
  19. track.longitude = [lon doubleValue];
  20.  
  21. MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Title of Place Here" andCoordinate:track];
  22.  
  23. [self.mapView addAnnotation:newAnnotation];
  24. }
  25. }

第2个问题,非常相关:

在实现上述问题的答案后,我已经修改了我的代码.现在,我的坐标从前一个视图到我的MKMapView,所以我不必费心去做两次API调用,第二个是在MKMapView中.目前在我的ViewWillAppear中,我有以下内容,并且AGAIN遇到了一个问题,即视图不会居中并放大图钉:

  1. if ([self.stringToDisplay isEqualToString: @"Firehouse Gallery"])
  2. {
  3. UIImage *img = [UIImage imageNamed:@"firehouse.jpg"];
  4. [imageView setImage:img];
  5.  
  6. CLLocationCoordinate2D track;
  7. track.latitude = [lat doubleValue];
  8. track.longitude = [lon doubleValue];
  9.  
  10. MKCoordinateRegion region;
  11. MKCoordinateSpan span;
  12. span.latitudeDelta = 0.01;
  13. span.longitudeDelta = 0.01;
  14. region.span = span;
  15. region.center = track;
  16.  
  17. MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Firehouse Gallery" andCoordinate:track];
  18.  
  19. [self.mapView addAnnotation:newAnnotation];
  20. [self.mapView setRegion:region animated:TRUE];
  21. [self.mapView regionThatFits:region];
  22. }

反馈非常感谢,因为我不知道还应该做些什么.引脚加载到正确的坐标上,只是没有居中/缩放…

解决方法

试试这个:
  1. {
  2. CLLocationCoordinate2D track;
  3. track.latitude = [lat doubleValue];
  4. track.longitude = [lon doubleValue];
  5.  
  6. MKCoordinateRegion region;
  7. MKCoordinateSpan span;
  8. span.latitudeDelta = 0.01;
  9. span.longitudeDelta = 0.01;
  10. region.span = span;
  11. region.center = track;
  12.  
  13. MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Title of Place Here" andCoordinate:track];
  14.  
  15. [self.mapView addAnnotation:newAnnotation];
  16. [self.mapView setRegion:region animated:TRUE];
  17. [self.mapView regionThatFits:region];
  18. }

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