blocks|key|2606167|text|这可以完成创建MKOverlayPathView类的子类。您需要覆盖(void)createPath方法，基本上可以使用UIBezierPath创建弧，或者直接创建弧形作为路径，这是可能的，但我还没有完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2606168|一旦在方法上定义了路径，就需要使用新创建的路径设置类的path属性。这样，路径的呈现就会自动完成。|2606169|希望这能有所帮助。|2606170|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

This can be accomplish creating a subclass of the MKOverlayPathView class. You need to override the (void)createPath method, and basically you could use a UIBezierPath to create the arc, or create an arc as path directly, which is possible but I haven't done it yet. 

Once you define the path on the method, you need to set the path property of the class with the newly created path. That way, the rendering of the path is going to be done automatically. 

Hope this helps.

blocks|key|1409223|text|我已经实现了这一点，为飞机在两个机场之间使用MKPolyline绘制一个很大的圆周路线。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409224|%2B+(void)createGreatCircleMKPolylineFromPoint:(CLLocationCoordinate2D)point1+
+++++++++++++++++++++++++++++++++++++toPoint:(CLLocationCoordinate2D)point2
++++++++++++++++++++++++++++++++++forMapView:(MKMapView*)mapView
{
double+lat1+=+point1.latitude;
double+lon1+=+point1.longitude;
double+lat2+=+point2.latitude;
double+lon2+=+point2.longitude;
lat1+=+lat1+*+(PI/180);
lon1+=+lon1+*+(PI/180);
lat2+=+lat2+*+(PI/180);
lon2+=+lon2+*+(PI/180);
double+d+=+2+*+asin(+sqrt(pow((+sin(+(lat1-lat2)/2)+),+2)+%2B+cos(lat1)+*+cos(lat2)+*+pow((+sin(+(lon1-lon2)/2)+),+2)));
int+numsegs+=+100;
CLLocationCoordinate2D+*coords+=+malloc(sizeof(CLLocationCoordinate2D)+*+numsegs);
double+f+=+0.0;
for(int+i=1;+i<=numsegs;+i%2B%2B)
{
++++f+%2B=+1.0+/+(float)numsegs;
++++double+A=sin((1-f)*d)/sin(d);
++++double+B=sin(f*d)/sin(d);
++++double+x+=+A*cos(lat1)+*+cos(lon1)+%2B++B+*+cos(lat2)+*+cos(lon2);
++++double+y+=+A*cos(lat1)+*+sin(lon1)+%2B++B+*+cos(lat2)+*+sin(lon2);
++++double+z+=+A*sin(lat1)+++++++++++%2B++B*sin(lat2);
++++double+latr=atan2(z,+sqrt(pow(x,+2)+%2B+pow(y,+2)+));
++++double+lonr=atan2(y,+x);
++++double+lat+=+latr+*+(180/PI);
++++double+lon+=+lonr+*+(180/PI);
++++//++++++++NSLog(@"lat:+%25f+lon:+%25f",+lat,+lon);
++++CLLocationCoordinate2D+loc+=+CLLocationCoordinate2DMake(lat,+lon);
++++coords[i+-+1]+=+loc;
}

//check+for+circling+west+to+east.+If+the+plane+is+crossing+180,+we+need
//to+draw+two+lines+or+else+the+polyline+connects+the+dots+and+draws+a+straight
//line+all+the+way+across+the+map.
CLLocationCoordinate2D+prevCoord;
BOOL+twoLines+=+NO;
int+numsegs2+=+0;
CLLocationCoordinate2D+*coords2;

for(int+i=0;+i<numsegs;+i%2B%2B)
{
++++CLLocationCoordinate2D+coord+=+coords[i];
++++if(prevCoord.longitude+<+-170+&&+prevCoord.longitude+>+-180++&&+prevCoord.longitude+<+0+
+++++++&&+coord.longitude+>+170+&&+coord.longitude+<+180+&&+coord.longitude+>+0)
++++{
++++++++twoLines+=+YES;
++++++++coords2+=+malloc(sizeof(CLLocationCoordinate2D)+*+(numsegs+-+i));
++++++++numsegs2+=+numsegs+-+i;
++++++++for(int+j=0;+j<numsegs2;+j%2B%2B)
++++++++{
++++++++++++coords2[j]+=+coords[i+%2B+j];
++++++++}
++++++++break;
++++}
++++prevCoord+=+coord;
}

//remove+any+previously+added+overlays
[mapView+removeOverlays:mapView.overlays];

if(twoLines)
{
++++MKPolyline+*polyline+=+[MKPolyline+polylineWithCoordinates:coords+count:numsegs+-+numsegs2];
++++free(coords);
++++[mapView+addOverlay:polyline];

++++MKPolyline+*polyline2+=+[MKPolyline+polylineWithCoordinates:coords2+count:numsegs2];
++++free(coords2);
++++[mapView+addOverlay:polyline2];
}
else
{
++++MKPolyline+*polyline+=+[MKPolyline+polylineWithCoordinates:coords+count:numsegs];
++++free(coords);
++++[mapView+addOverlay:polyline];
}

}|code-block|syntax|javascript|1409225|现在您已经创建了覆盖，现在只需要在mapView:viewForOverlay中提供一个MKOverlayView。|1409226|-+(MKOverlayView*)mapView:(MKMapView+*)mapView+viewForOverlay:(id<MKOverlay>)overlay
{
++++MKPolyline+*polyline+=+(MKPolyline*)overlay;
++++MKPolylineView+*view+=+[[[MKPolylineView+alloc]+initWithPolyline:polyline]+autorelease];
++++//choose+your+line+params+here
++++view.lineWidth+=+2;
++++view.fillColor+=+[UIColor+blueColor];
++++return+view;
}|1409227|希望这能有所帮助。|1409228|截图http://s1-03.twitpicproxy.com/photos/large/489178500.png|offset|length|1409229|entityMap|0|LINK|mutability|MUTABLE|url|http://s1-03.twitpicproxy.com/photos/large/489178500.png^0|0|0|0|0|0|0|1M|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

I've implemented this for drawing a great circle route for aircraft going between two airports using MKPolyline. 

<pre><code>+ (void)createGreatCircleMKPolylineFromPoint:(CLLocationCoordinate2D)point1 
 toPoint:(CLLocationCoordinate2D)point2
 forMapView:(MKMapView*)mapView
{
double lat1 = point1.latitude;
double lon1 = point1.longitude;
double lat2 = point2.latitude;
double lon2 = point2.longitude;
lat1 = lat1 * (PI/180);
lon1 = lon1 * (PI/180);
lat2 = lat2 * (PI/180);
lon2 = lon2 * (PI/180);
double d = 2 * asin( sqrt(pow(( sin( (lat1-lat2)/2) ), 2) + cos(lat1) * cos(lat2) * pow(( sin( (lon1-lon2)/2) ), 2)));
int numsegs = 100;
CLLocationCoordinate2D *coords = malloc(sizeof(CLLocationCoordinate2D) * numsegs);
double f = 0.0;
for(int i=1; i&lt;=numsegs; i++)
{
 f += 1.0 / (float)numsegs;
 double A=sin((1-f)*d)/sin(d);
 double B=sin(f*d)/sin(d);
 double x = A*cos(lat1) * cos(lon1) + B * cos(lat2) * cos(lon2);
 double y = A*cos(lat1) * sin(lon1) + B * cos(lat2) * sin(lon2);
 double z = A*sin(lat1) + B*sin(lat2);
 double latr=atan2(z, sqrt(pow(x, 2) + pow(y, 2) ));
 double lonr=atan2(y, x);
 double lat = latr * (180/PI);
 double lon = lonr * (180/PI);
 // NSLog(@"lat: %f lon: %f", lat, lon);
 CLLocationCoordinate2D loc = CLLocationCoordinate2DMake(lat, lon);
 coords[i - 1] = loc;
}

//check for circling west to east. If the plane is crossing 180, we need
//to draw two lines or else the polyline connects the dots and draws a straight
//line all the way across the map.
CLLocationCoordinate2D prevCoord;
BOOL twoLines = NO;
int numsegs2 = 0;
CLLocationCoordinate2D *coords2;

for(int i=0; i&lt;numsegs; i++)
{
 CLLocationCoordinate2D coord = coords[i];
 if(prevCoord.longitude &lt; -170 &amp;&amp; prevCoord.longitude &gt; -180 &amp;&amp; prevCoord.longitude &lt; 0 
 &amp;&amp; coord.longitude &gt; 170 &amp;&amp; coord.longitude &lt; 180 &amp;&amp; coord.longitude &gt; 0)
 {
 twoLines = YES;
 coords2 = malloc(sizeof(CLLocationCoordinate2D) * (numsegs - i));
 numsegs2 = numsegs - i;
 for(int j=0; j&lt;numsegs2; j++)
 {
 coords2[j] = coords[i + j];
 }
 break;
 }
 prevCoord = coord;
}

//remove any previously added overlays
[mapView removeOverlays:mapView.overlays];

if(twoLines)
{
 MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coords count:numsegs - numsegs2];
 free(coords);
 [mapView addOverlay:polyline];

 MKPolyline *polyline2 = [MKPolyline polylineWithCoordinates:coords2 count:numsegs2];
 free(coords2);
 [mapView addOverlay:polyline2];
}
else
{
 MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coords count:numsegs];
 free(coords);
 [mapView addOverlay:polyline];
}

}
</code></pre>

You've now created the overlay(s), now you just need to provide an MKOverlayView in mapView:viewForOverlay.

<pre><code>- (MKOverlayView*)mapView:(MKMapView *)mapView viewForOverlay:(id&lt;MKOverlay&gt;)overlay
{
 MKPolyline *polyline = (MKPolyline*)overlay;
 MKPolylineView *view = [[[MKPolylineView alloc] initWithPolyline:polyline] autorelease];
 //choose your line params here
 view.lineWidth = 2;
 view.fillColor = [UIColor blueColor];
 return view;
}
</code></pre>

Hope this helps.

<a href="http://s1-03.twitpicproxy.com/photos/large/489178500.png">Screenshot http://s1-03.twitpicproxy.com/photos/large/489178500.png</a>

blocks|key|2964480|text|numsegs参数应根据地图缩放水平和两个点的距离变化。两个点的lat/lon坐标可转换为像素坐标。因此，numsegs参数可以看作是像素差的函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2964481|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The numsegs parameter should be changeable according to the map zoom level and the distance of the two points. The lat/lon coordinate of the two points can be transformed into pixel coordinate. Thus the numsegs parameter can be viewed as a function of pixel differences.

blocks|key|2606223|text|这是游戏的后期，但值得一提的是MKGeodesicPolyline，新的自iOS+7.0，它“跟踪最短的路径沿地球表面”。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2606224|这样，创建和添加一个MKPolylineOverlay类型的测地线就变得简单了。|2606225|points+=+[CLLocationCoordinate2DMake(27.123,+85.765),
++++++++++++++++++CLLocationCoordinate2DMake(41.444,+106.987)]
geodesic+=+MKGeodesicPolyline(coordinates:+points,+count:+2)
mapView.add(geodesic)|code-block|syntax|javascript|2606226|请记住包括呈现器，并给mapView一个委托：|2606227|//MARK:+-+MKMapView+Delegate+Method
func+mapView(_+mapView:+MKMapView,+rendererFor+overlay:+MKOverlay)+->+MKOverlayRenderer+{
++++if+overlay+is+MKGeodesicPolyline+{
++++++++let+polylineRenderer+=+MKPolylineRenderer(overlay:+overlay)
++++++++polylineRenderer.strokeColor+=+UIColor.white
++++++++polylineRenderer.lineWidth+=+2.5
++++++++return+polylineRenderer
++++}
}|2606228|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/mapkit/mkgeodesicpolyline^0|F|I|F|I|0|0|A|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|17|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|18|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

It is late in the game, but worth mentioning <a href="https://developer.apple.com/reference/mapkit/mkgeodesicpolyline" rel="nofollow noreferrer"><code>MKGeodesicPolyline</code></a>, new since iOS 7.0, which 'traces the shortest path along the surface of the Earth'.

With this it becomes simple to create and add an <code>MKPolylineOverlay</code> of type Geodesic Polyline.

<pre><code>points = [CLLocationCoordinate2DMake(27.123, 85.765),
 CLLocationCoordinate2DMake(41.444, 106.987)]
geodesic = MKGeodesicPolyline(coordinates: points, count: 2)
mapView.add(geodesic)
</code></pre>

remember to include the renderer and give the mapView a delegate:

<pre><code>//MARK: - MKMapView Delegate Method
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -&gt; MKOverlayRenderer {
 if overlay is MKGeodesicPolyline {
 let polylineRenderer = MKPolylineRenderer(overlay: overlay)
 polylineRenderer.strokeColor = UIColor.white
 polylineRenderer.lineWidth = 2.5
 return polylineRenderer
 }
}
</code></pre>

I'm trying to draw a Great Circle line between two lat/lon points on an MKMapView. This is a line that would appear rounded (a 'straight' line on a globe) and is best visualized <a href="http://greatcircleroutemapkit.wordpress.com/" rel="nofollow">here</a>. In fact this very odd WordPress site seems to begin to describe exactly how to do this, but it ends abruptly after the first few steps. 

Reading in Apple's documentation I see 

<blockquote>
 In iOS 4.0 and later, you can also use projected map coordinates instead of regions to specify some values. When you project the curved surface of the globe onto a flat surface, you get a two-dimensional version of a map where longitude lines appear to be parallel. Locations and distances on this map are specified using the MKMapPoint, MKMapSize, and MKMapRect data types. You can use these data types to specify the map’s visible region and when specifying the location of overlays.
</blockquote>

How I would apply this to a Great Circle overlay I'm not sure. Can anyone help?

Drawing Great Circle overlay lines on an MKMapView

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我试图在MKMapView上的两个lat/lon点之间画一条伟大的圆圈线。这是一条显示为圆形(地球仪上的“直线”)的线条，并且是最好的可视化。事实上，这个非常奇怪的WordPress站点似乎开始准确地描述如何做到这一点，但在最初的几步之后，它突然结束了。阅读苹果的文档我看到了在iOS 4.0及更高版本中，您还可以使用投...

问在MKMapView上绘制大圆圈覆盖线
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在MKMapView上绘制大圆圈覆盖线EN