地图视图上的虚线 [英] Dotted line on map view
问题描述
我可以使用下面的代码(相反部分)在两点之间创建一条线,我怎样才能使线条点缀而不是实线?也可以更改不透明度线越长?
I can create a line between two points fairly easy with the below code (part of it anyways) How could I make the line dotted instead of solid? Also would it be possible to change the opacity the longer the line is?
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id < MKOverlay >)overlay
{
MKPolylineRenderer *renderer =[[MKPolylineRenderer alloc] initWithPolyline:overlay];
renderer.strokeColor = [UIColor orangeColor];
renderer.lineWidth = 3.0;
return renderer;
}
推荐答案
你可以使用 lineDashPattern
属性,用于为该行创建所需的模式。
You can use the lineDashPattern
property to create the pattern you want for the line.
MKPolylineRenderer
是 MKOverlayPathRenderer
的子类,其中包含财产和其他一些(见文件的链接)。
MKPolylineRenderer
is a subclass of MKOverlayPathRenderer
which has that property and a few others (see the link to the documentation).
例如,这会将模式设置为2点长的行,然后是5点间隙。在折线的整个长度上重复该模式。
For example, this sets the pattern to a line 2 points long followed by a 5 point gap. The pattern is repeated for the entire length of the polyline.
renderer.lineDashPattern = @[@2, @5];
对于不透明度,您可以将alpha应用于 strokeColor
:
renderer.strokeColor = [[UIColor orangeColor] colorWithAlphaComponent:0.5];
或设置 alpha
属性:
renderer.alpha = 0.5;
不确定你的意思是线越长是问题的一部分。
Not sure what you mean by "the longer the line is" part of the question.
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