在 iOS 7 中使用谷歌地图绘制折线？

Question

使用这个link。

我试图获取从一个坐标到另一个坐标的路线方向，但没有得到路线。下面提到使用的编码...

        NSArray *routesArray = [res objectForKey:@"routes"]; 
        NSDictionary *routeDict = [routesArray objectAtIndex:0];
        NSDictionary *routeOverviewPolyline = [routeDict objectForKey:@"overview_polyline"];
        NSString *points = [routeOverviewPolyline objectForKey:@"points"];
        GMSPath *path = [GMSPath pathFromEncodedPath:points];

        polyline = [GMSPolyline polylineWithPath:path];
        polyline.strokeColor = [UIColor greenColor];
        polyline.strokeWidth = 10.f;

        polyline.map = mapView_;

谁能知道。帮我解决这个问题..

Answer 1

您可以使用GoogleMapsDirection 从Google Directions API 获取路径或DirectionResponse。 NSLogs 对于查看您正在处理的内容很有用。

[[GMDirectionService sharedInstance] getDirectionsFrom:origin to:destination        succeeded:^(GMDirection *directionResponse) {   
    if ([directionResponse statusOK]){
        NSLog(@"Duration : %@", [directionResponse durationHumanized]);
        NSLog(@"Distance : %@", [directionResponse distanceHumanized]);
        NSArray *routes = [[directionResponse directionResponse] objectForKey:@"routes"];
        // NSLog(@"Route : %@", [[directionResponse directionResponse] objectForKey:@"routes"]);

    }
} failed:^(NSError *error) {
        NSLog(@"Can't reach the server")
}];

一旦你有了 json，你就可以得到路径点（这显示了索引 0 处的第一条路线）。

GMSPath *path = [GMSPath pathFromEncodedPath:routes[0][@"overview_polyline"][@"points"]];

然后您可以将路径转换为折线并将其绘制在您的 mapView 上，并根据需要设置 strokeColor 和 strokeWidth。

GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
polyline.strokeColor = [UIColor redColor];
polyline.strokeWidth = 5.f;

然后将 polyline.map 属性设置为您的 mapView。

polyline.map = mapView;

终于把所有东西放在一起

[[GMDirectionService sharedInstance] getDirectionsFrom:origin to:destination          succeeded:^(GMDirection *directionResponse) {   
    if ([directionResponse statusOK]){
        NSLog(@"Duration : %@", [directionResponse durationHumanized]);
        NSLog(@"Distance : %@", [directionResponse distanceHumanized]);
        NSArray *routes = [[directionResponse directionResponse] objectForKey:@"routes"];
        // NSLog(@"Route : %@", [[directionResponse directionResponse] objectForKey:@"routes"]);

        GMSPath *path = [GMSPath pathFromEncodedPath:routes[0][@"overview_polyline"]  [@"points"]];
        GMSPolyline *polyline = [GMSPolyline polylineWithPath:path];
        polyline.strokeColor = [UIColor redColor];
        polyline.strokeWidth = 5.f;
        polyline.map = mapView;

    }
} failed:^(NSError *error) {
        NSLog(@"Can't reach the server")
}];

我发现CocoaPods 对于安装 Google Maps SDK 和 GoogleMapsDirection 很有用。