iOS-百度地图_屏幕所显示范围内的经纬度

　　//当前屏幕中心点的经纬度

CGFloat centerLongitude = self.mapView.region.center.longitude;

CGFloat centerLatitude = self.mapView.region.center.latitude;

//当前屏幕显示范围的经纬度

CLLocationDegrees pointssLongitudeDelta = self.mapView.region.span.longitudeDelta;

CLLocationDegrees pointssLatitudeDelta = self.mapView.region.span.latitudeDelta;

//左上角

CGFloat leftUpLong = centerLongitude - pointssLongitudeDelta/2.0;

CGFloat leftUpLati = centerLatitude - pointssLatitudeDelta/2.0;

//右上角

CGFloat rightUpLong = centerLongitude + pointssLongitudeDelta/2.0;

CGFloat rightUpLati = centerLatitude - pointssLatitudeDelta/2.0;

//左下角

CGFloat leftDownLong = centerLongitude - pointssLongitudeDelta/2.0;

CGFloat leftDownlati = centerLatitude + pointssLatitudeDelta/2.0;

//右下角

CGFloat rightDownLong = centerLongitude + pointssLongitudeDelta/2.0;

CGFloat rightDownLati = centerLatitude + pointssLatitudeDelta/2.0;

NSLog(@"\n 左上   %f,%f---------\n 右上   %f,%f-------\n 左下  %f,%f----- \n 右下  %f,%f",leftUpLong,leftUpLati,rightUpLong,rightUpLati,leftDownLong,leftDownlati,rightDownLong,rightDownLati);