Could a map开发者_JS百科View.region.span.longitudeDelta or mapView.region.span.latitudeDelta be negative ?
The delta cannot be a negative value. Because it is a kind of distance and distance cannot be negative.
Could a mapView.region.span.longitudeDelta or mapView.region.span.latitudeDelta be negative?
Could a map开发者_JS百科View.region.span.longitudeDelta or mapView.region.span.latitudeDelta be negative ?The delta cannot be a negative value. Because it is a kind of distance and distance cannot be
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