使用MKPolyline& amp的覆盖问题MKPolylineView [英] Trouble with overlay using MKPolyline & MKPolylineView

问题描述

我使用addOverlay：方法为我的MKMapView添加了一个叠加层。使用MKPolyline制作覆盖层并使用MKPolylineView进行描边。笔触颜色为蓝色，alpha值为0.7。

I have added an overlay to my MKMapView using the addOverlay: method. The overlay was made using MKPolyline and stroked using MKPolylineView. The stroke color is blue, with an alpha value of 0.7.

最初加载视图时，正确绘制叠加层，但叠加层的周围区域也是蓝色...
当我捏&缩小，蓝色区域仍然存在，但它会调整到我的新缩放级别。这有点难以描述......但基本上我有一个小的矩形法线贴图被困在一个较大的蓝色矩形内。

When the view initially loads, the overlay is drawn correctly but the surrounding areas of the overlay are blue as well... When I pinch & zoom out, the blue area is still there but it adjusts to my new zoom level. This is somewhat hard to describe... but basically I have a small rectangle of "normal map" trapped inside a larger rectangle that is blue.

它会消失缩小以查看整个国家/地区，当我放大所有内容时，一切正常。

It will disappear when I zoom out to view the entire country and when I zoom back in everything is normal.

我认为这可能是因为我没有正确实施MKOverlayProtocol？

I think this may be caused by me not implementing the MKOverlayProtocol correctly?

如果有人有任何想法，请按我的方式抛出...

If anyone has any ideas please throw them my way...

编辑：

以下是创建MKPolyline和委托方法的代码。

Here is the code that creates the MKPolyline and the delegate method.

-(MKPolyline *)bluePolyline
{
    CLLocationCoordinate2D bluePoints[16];
    bluePoints[0] = CLLocationCoordinate2DMake(27.526483, -97.882454);
    bluePoints[1] = CLLocationCoordinate2DMake(27.526407, -97.887883);
    bluePoints[2] = CLLocationCoordinate2DMake(27.527244, -97.887905);
    bluePoints[3] = CLLocationCoordinate2DMake(27.527282, -97.887304);
    bluePoints[4] = CLLocationCoordinate2DMake(27.527577, -97.887304);
    bluePoints[5] = CLLocationCoordinate2DMake(27.527596, -97.885727);
    bluePoints[6] = CLLocationCoordinate2DMake(27.530194, -97.88577); //Seale St. &      Corrale Ave.
    bluePoints[7] = CLLocationCoordinate2DMake(27.530213, -97.883892); //Retama & Corral Ave.
    bluePoints[8] = CLLocationCoordinate2DMake(27.530279,-97.881907);
    bluePoints[9] = CLLocationCoordinate2DMake(27.530337,-97.880201);
    bluePoints[10] = CLLocationCoordinate2DMake(27.530356,-97.877959);
    bluePoints[11] = CLLocationCoordinate2DMake(27.52753,-97.877884); //West C Ave. & Armstrong
    bluePoints[12] = CLLocationCoordinate2DMake(27.527492,-97.878367); 
    bluePoints[13] = CLLocationCoordinate2DMake(27.527397,-97.878817);
    bluePoints[14] = CLLocationCoordinate2DMake(27.527349,-97.882454);
    bluePoints[15] = CLLocationCoordinate2DMake(27.526483, -97.882453);

    if(bluePolyline == nil)
    {
        bluePolyline = [MKPolyline polylineWithCoordinates:bluePoints count:16];
    }
    bluePolyline.title = @"Blue Route";
    _bluePolyline = bluePolyline;
    return _bluePolyline;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKPolylineView *aView = [[MKPolylineView alloc] initWithPolyline:(MKPolyline *)overlay];

//aView.fillColor = [[UIColor cyanColor] colorWithAlphaComponent:0.2];
aView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.6];

aView.lineWidth = 10;

return aView;
}

推荐答案

我最终修复了我的问题通过实现 MKOverlay 协议方法：

I ended up fixing my problem by implementing the MKOverlay Protocol method:

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay; 

如下：

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKPolylineView *aView = [[MKPolylineView alloc] initWithPolyline:(MKPolyline *)overlay];

    if(overlay.title == @"Blue Route")
    {
        aView.lineWidth = 7.0;
        aView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.6];
    }
    if(overlay.title == @"Gold Route-A")
    {
        aView.lineWidth = 10.0;
        aView.strokeColor = [[UIColor yellowColor] colorWithAlphaComponent:0.6];
    }
    if(overlay.title == @"Gold Route-B")
    {
        aView.lineWidth = 7.0;
        aView.strokeColor = [[UIColor yellowColor] colorWithAlphaComponent:0.6];
    }
    return aView;

}

每个叠加层的创建位置在我的模型中的其他地方。

Where each overlay was created elsewhere in my model.

这篇关于使用MKPolyline& amp的覆盖问题MKPolylineView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！