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原文http://blog.csdn.net/favormm/article/details/8028026#define MINIMUM_ZOOM_ARC 0.014 //approximately 1 miles (1 degree of arc ~= 69 miles)#define ANNOTATION_REGION_PAD_FACTOR 1.15#define MAX_DEGREES_ARC 360//size the mapView region to fit its annotations- (void)zoomMapViewToFitAnnotations:(MKMapView 阅读全文