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我的MapKit代碼是:合理的縮放級別
MKCoordinateRegion region;
region.center = location;
MKCoordinateSpan span;
span.latitudeDelta = .005;
span.longitudeDelta = .005;
region.span = span;
[mapView setRegion:region animated:TRUE];
跨度水平爲0.005,當我測試這個iPhone上的變焦非常高,這是不實際的,我希望有一個合理的縮放級別,所以我應該給予什麼樣的價值? thx):