前言
- 继续上一次的Demo,本次添加了同一路线的多条不同的公交线路展示,默认显示第0条。并且通过点击公交路线来切换选中的路线。
使用场景:
- 公交路线规划
准备:
路线切换
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创建QPolyline的子类,用于区分步行部分和公交部分
@interface RoutePlanWalkingPolyline : QPolyline @end
@interface RoutePlanBusingPolyline : QPolyline // 判断当前路线是否已经被选中 @property (nonatomic, assign) BOOL isSelected; @end
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在创建路线Mode时,通过判断路线的种类来创建不同的模型,并且默认选中第0条路线:
/* 1. 默认选择第一个公交车线路 2. 当前公交车线路 alpha = 1,有箭头 3. 备用公交车线路 alpha = 0.5, 无箭头 4. 点击备用公交车线路可以切换 */ // 驾车蚯蚓线 // 遍历所有驾车路线 for (int i = 0; i < plan.lines.count; i++) { QMSBusingRouteTransitLine *line = plan.lines[i]; CLLocationCoordinate2D coords[line.polyline.count]; for (int i = 0; i < line.polyline.count; i++) { NSValue *value = line.polyline[i]; CLLocationCoordinate2D coord = [value coordinateValue]; coords[i] = coord; } RoutePlanBusingPolyline *busPolyline = [[RoutePlanBusingPolyline alloc] initWithCoordinates:coords count:line.polyline.count]; busPolyline.isSelected = i==0 ? YES : NO; [self.mapView addOverlay:busPolyline]; [self.selectRouteOverlayArray addObject:busPolyline]; }
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在添加折线视图时,额外添加判断当前的公交模型是否已经被选中的步骤
RoutePlanBusingPolyline *busingPolyline = (RoutePlanBusingPolyline *)overlay; // 路线箭头 if (busingPolyline.isSelected) { polylineView.strokeColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:0.5]; polylineView.drawSymbol = YES; polylineView.zIndex = 1; } else { polylineView.strokeColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:0.5]; polylineView.drawSymbol = NO; polylineView.zIndex = 0; }
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最后,监听Overlay的点击方法,并判断回调的Overlay是否为公交路线的数据模型,然后选中该模型,取消选中其他的模型:
- (void)mapView:(QMapView *)mapView didTapOverlay:(id<QOverlay>)overlay { // 判断是否是路线 if ([overlay isKindOfClass:[RoutePlanBusingPolyline class]]) { for (QPolyline *polyline in self.selectRouteOverlayArray) { if ([polyline isKindOfClass:[RoutePlanBusingPolyline class]]) { RoutePlanBusingPolyline *busingPolyline = (RoutePlanBusingPolyline *)polyline; QTexturePolylineView *polylineView = (QTexturePolylineView *)[self.mapView viewForOverlay:busingPolyline]; if (busingPolyline == overlay) { // 选中:实心颜色 busingPolyline.isSelected = YES; polylineView.strokeColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:0.5]; polylineView.zIndex = 1; polylineView.drawSymbol = YES; } else { // 未选中:虚色 busingPolyline.isSelected = NO; polylineView.strokeColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:0.5]; polylineView.zIndex = 0; polylineView.drawSymbol = NO; } } } } }
示例图
存在缺陷
- 在第4步中切换蚯蚓线的
drawSymbol
时出现了相反的情况,不知是否为bug,有待研究。 - 观察腾讯地图app,公交路线应该是先选择线路,然后再绘制到地图上,因为会有不同的公交走相同的路线的情况,下次Demo会补全该功能。
Demo下载
链接: https://pan.baidu.com/s/1mRNSQhFrgdlJejng7-6Qkg 密码: u1bn