Ios MkMapView缩放级别

我将MkMapView与谷歌地图一起使用。我成功地用注释pin显示了地图视图和地址。但我希望提高缩放级别。我如何以编程方式设置它

-(void)showMyAddress
{

//Hide the keypad
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.2;
span.longitudeDelta=0.2;

CLLocationCoordinate2D location = [self addressLocation];
region.span=span;
region.center=location;



if(addAnnotation != nil) {
    [mapView removeAnnotation:addAnnotation];
    [addAnnotation release];
    addAnnotation = nil;
}


addAnnotation = [[AddAnnotation alloc] initWithCoordinate:location ];
[addAnnotation setMTitle:@"abc"];
[addAnnotation setMSubTitle:@"def."]




[mapView addAnnotation:addAnnotation];

[mapView setRegion:region animated:TRUE];
[mapView regionThatFits:region];


}


-(CLLocationCoordinate2D) addressLocation {
NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", 
                       [@"abc" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];


NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString] encoding:NSStringEncodingConversionAllowLossy  error:nil];
NSArray *listItems = [locationString componentsSeparatedByString:@","];

double latitude = 0.0;
double longitude = 0.0;

if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
    latitude = [[listItems objectAtIndex:2] doubleValue];
    longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {

}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;

return location;
}

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使span.longitudeDelta和span.latitudeDelta变小（即，将其设置为0.02，而不是0.2，以便进行10倍缩放）。

试试这个好教程，它对我有帮助：

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此类别具有获取和设置缩放级别的功能

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这是一个私有api，有人有幸提交了它吗？