MapKit 线条和多边形
我上面有一张地图和一条线（多段线）。我正在尝试围绕这条线制作一个平滑的多边形。我面临的问题是如何创建看起来光滑且末端呈圆形的多边形。有什么建议/解决方案吗？ 我尝试在现有的一条不同粗细的线条上画另一条线，但它在缩放时效果不佳......
I have a map and line (poly-line) on it. I'm trying to make a smooth polygon around this line. The problem I'm facing is how to create that polygon look smooth with rounded ends. any suggestions/solutions?
I've tried to draw another line over existing one with different thickness, but it doesn't work well with zooming...
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在 MKOverlayPathView（MKPolylineView 的超类）中，有一个名为 lineCap 的属性。将其设置为
kCGLineCapRound检查此处：
http://developer.apple.com/ Library/ios/#documentation/MapKit/Reference/MKOverlayPathView_class/Reference/Reference.html
希望有帮助。
In MKOverlayPathView which is a superclass of MKPolylineView there is a property called lineCap. Set it to
kCGLineCapRoundcheck here:
http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKOverlayPathView_class/Reference/Reference.html
Hope it helps.