Question

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。

当视图最初加载时，正确绘制叠加层，但叠加层的周围区域也是蓝色的...... 当我捏＆amp;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。

当我缩小以查看整个国家/地区以及当我放大所有内容时，它会消失。

我认为这可能是因为我没有正确实现MKOverlayProtocol？

如果有人有任何想法，请按我的方式抛弃......

编辑：

以下是创建MKPolyline和委托方法的代码。

-(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;
}

Answer 1

我最终通过实施MKOverlay协议方法解决了我的问题：

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

像这样：

- (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;

}

每个叠加层都是在我的模型中的其他地方创建的。

使用MKPolyline＆amp; amp; MKPolylineView

1 个答案: