Google maps ios 5中在海洋中显示的地图视图

在我升级到ios 5.0之前，我有一个运行良好的应用程序。更新后，地图显示在海洋中。我不确定出了什么问题。 这是我正在使用的代码

[mapView setMapType:MKMapTypeStandard]

[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } }; 
region.center.latitude = deleg.selectedVenue.latitude;
region.center.longitude = deleg.selectedVenue.longitude;
region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapView setRegion:region animated:YES];

在ios 5.0中如何正确地执行此操作？

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谢谢

这是我在iOS5下工作的代码片段。请随时提问

// grab the location from persistent store
CLLocation *loc = [store currentLocation];


CLLocationCoordinate2D zoomLocation;
float zoom;

// it will be NULL on first launch, so initialize to someplace interesting.
if (!loc) {
    CLLocationCoordinate2D longPointLightLocation;
    longPointLightLocation.latitude = 42.033126;
    longPointLightLocation.longitude = -70.168621;
    // center the map so the initial zoom when the GPS kicks in is from HERE, not the default
    [mapView setCenterCoordinate:longPointLightLocation animated:NO];
    zoomLocation = longPointLightLocation;
    zoom = 50;    // on first launch, zoom way out
} else {
    zoomLocation.latitude = loc.coordinate.latitude;
    zoomLocation.longitude = loc.coordinate.longitude;
    zoom = 2;
}

MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, zoom*METERS_PER_MILE, zoom*METERS_PER_MILE);
[mapView setRegion:[mapView regionThatFits:viewRegion] animated:NO]; 

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检查deleg.SelectedVince是否为有效坐标，例如

if (CLLocationCoordinate2DIsValid(deleg.selectedVenue)) {
    // add to your mapView
}
else {
    NSLog(@"coordinate is invalid");
}

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其中CLLocationCoordinate2DIsValid是在核心位置框架中声明的函数。

deleg.selectedVince设置的方式和位置？这段代码是用什么方法编写的？出于某种原因，这里的var可能为零。