Iphone 如何在MKOBLADE中间定位UIMAPVIEW

我使用以下代码（基于Apple WWDC 2010 TileMap示例）加载带有MKOverlay图像的UIMapView（这可能在viewDidLoad方法中）：

接下来，我要将UIMapView地图放在这个覆盖图的中心。目前，我正在对纬度和经度进行硬编码，如下所示：

double myLatitude = ...;
double myLongitude = ...;
CLLocation *location = [[CLLocation alloc] initWithLatitude:myLatitude longitude:myLongitude];
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 4000, 4000);
MKCoordinateRegion adjustedRegion = [map regionThatFits:viewRegion];
[map setRegion:adjustedRegion animated:YES];

double x, y;

x = MKMapRectGetMidX([overlay boundingMapRect]);
y = MKMapRectGetMidY([overlay boundingMapRect]);
CLLocationCoordinate2D coord = MKCoordinateForMapPoint(MKMapPointMake(x, y));

MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(coord, 4000, 4000);
MKCoordinateRegion adjustedRegion = [map regionThatFits:viewRegion];
[map setRegion:adjustedRegion animated:YES];

这个很好用。我已尝试按如下方式计算叠加的中心：

double myLatitude = ...;
double myLongitude = ...;
CLLocation *location = [[CLLocation alloc] initWithLatitude:myLatitude longitude:myLongitude];
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, 4000, 4000);
MKCoordinateRegion adjustedRegion = [map regionThatFits:viewRegion];
[map setRegion:adjustedRegion animated:YES];

double x, y;

x = MKMapRectGetMidX([overlay boundingMapRect]);
y = MKMapRectGetMidY([overlay boundingMapRect]);
CLLocationCoordinate2D coord = MKCoordinateForMapPoint(MKMapPointMake(x, y));

MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(coord, 4000, 4000);
MKCoordinateRegion adjustedRegion = [map regionThatFits:viewRegion];
[map setRegion:adjustedRegion animated:YES];

但这是行不通的。mkCoordinateFormAppPoint返回覆盖外的纬度/经度。我不明白为什么

有人能提出解决办法吗

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提前感谢…

您是否修改了示例代码中的boundingMapRect计算？尽管不需要调整的区域计算（setRegion将进行区域拟合），但居中代码看起来正常。我得到37.718590，-122.343750。你得到什么坐标？这也是我得到的…当坐标在覆盖层内时，它不在中心。