iphone - 如何在 iPhone 中滚动 map 时跟踪 map 区域

Question

我完成了在 iPhone 中以最大化缩放级别显示当前位置的 map View 。

但现在我想在 map View 中跟踪任何滚动以获得其可见区域。

是否有任何事件可以做到这一点，如果是，那么怎么做？

如果不是怎么可能？

Answer 1

是的，可以通过 mapView 的委托(delegate)实现。

- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated
{
    // This method is called whenever the currently displayed map region changes. 
    // During scrolling, this method may be called many times to report updates to the map position. 
    // Therefore, your implementation of this method should be as lightweight as possible to avoid affecting scrolling performance. 
   // *Straight from Apple's documentation

   MKMapRect visibleRect = [mapView visibleMapRect];
}