MapView显示所有注释并尽可能放大地图

Question

我基本上有一个地图,我添加了两个注释,它们按预期显示.

然后我使用以下代码:

let annotations = [start, end]
mapView?.showAnnotations(annotations, animated: false)

这会缩放以显示带有两个注释的地图,但地图可以放大更多并显示更详细的地图视图.

这就是我今天得到的,这是我想要的预期结果.

正如您所看到的,地图可以放大很多.

任何想法如何实现这一目标？

Answer 1

Swift 5.0 / 4.2 版本nyxee 的回答

extension MKMapView {

    /// When we call this function, we have already added the annotations to the map, and just want all of them to be displayed.
    func fitAll() {
        var zoomRect            = MKMapRect.null;
        for annotation in annotations {
            let annotationPoint = MKMapPoint(annotation.coordinate)
            let pointRect       = MKMapRect(x: annotationPoint.x, y: annotationPoint.y, width: 0.01, height: 0.01);
            zoomRect            = zoomRect.union(pointRect);
        }
        setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsets(top: 100, left: 100, bottom: 100, right: 100), animated: true)
    }

    /// We call this function and give it the annotations we want added to the map. we display the annotations if necessary
    func fitAll(in annotations: [MKAnnotation], andShow show: Bool) {
        var zoomRect:MKMapRect  = MKMapRect.null
    
        for annotation in annotations {
            let aPoint          = MKMapPoint(annotation.coordinate)
            let rect            = MKMapRect(x: aPoint.x, y: aPoint.y, width: 0.1, height: 0.1)
        
            if zoomRect.isNull {
                zoomRect = rect
            } else {
                zoomRect = zoomRect.union(rect)
            }
        }
        if(show) {
            addAnnotations(annotations)
        }
        setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsets(top: 100, left: 100, bottom: 100, right: 100), animated: true)
    }

}

Answer 2

用这个:

extension MKMapView {
    /// when we call this function, we have already added the annotations to the map, and just want all of them to be displayed.
    func fitAll() {
        var zoomRect            = MKMapRectNull;
        for annotation in annotations {
            let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)
            let pointRect       = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.01, 0.01);
            zoomRect            = MKMapRectUnion(zoomRect, pointRect);
        }
        setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsetsMake(100, 100, 100, 100), animated: true)
    }

    /// we call this function and give it the annotations we want added to the map. we display the annotations if necessary
    func fitAll(in annotations: [MKAnnotation], andShow show: Bool) {
        var zoomRect:MKMapRect  = MKMapRectNull

        for annotation in annotations {
            let aPoint          = MKMapPointForCoordinate(annotation.coordinate)
            let rect            = MKMapRectMake(aPoint.x, aPoint.y, 0.1, 0.1)

            if MKMapRectIsNull(zoomRect) {
                zoomRect = rect
            } else {
                zoomRect = MKMapRectUnion(zoomRect, rect)
            }
        }
        if(show) {
            addAnnotations(annotations)
        }
        setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsets(top: 100, left: 100, bottom: 100, right: 100), animated: true)
    }

}

然后,在为MapView创建一个插座之后,例如map,当你和注释一起添加到一个被调用的数组的地图中时annotations,访问上面的方法,如下所示:

map.fitAll()

要么

map.fitAll(in:annotations, true)

分别.

在最后一个语句中使用true或false,具体取决于您之前是否已将注释添加到地图中...

Answer 3

在Swift中：

self.mapView.showAnnotations(self.mapView.annotations, animated: true)

这就是我用来显示所有注释的内容。几乎与您所做的相同。地图将其缩放以适合地图的可见部分或可用部分，在我的应用程序上，缩放效果很好，并且确实添加了一些填充，因此所有图钉都不会碰到边缘。

因此，完成地图后，您可以快速使用setVisibleMapRect：edgePadding：animated：使用带有负填充的新visibleRect。