我正在开发一个 iPhone 应用程序，该应用程序需要在 UIWebView 中显示从一个点 A 到另一个点 B 的步行路线，该 UIWebView 会加载具有相关参数的 Google map URL。

我正在加载的 URL 示例:

[self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://maps.google.com/maps?saddr=55.720923,12.513428&daddr=55.745666,12.546387"]]];

我需要 UIWebView 将方向显示为 map (如 map 上的线条)，如下面链接中的图片所示:

How I want the directions to be displayed (directions as a map)

但是，当此 URL 加载到 iPhone 上时，路线将显示为列表(请参阅下面的链接)。

How the directions are displayed (directions as a list)

用户需要按顶部栏中的 map 按钮才能以 map 形式查看路线。

如何设置 Google map URL 参数，以便在我的 iPhone 应用程序中直接将路线显示为 map (而不是列表!)？

最佳答案

如果你使用 MKMapView，这会容易得多。检查 nvpolyline来自github的项目。它将帮助您在点 a 和点 b 之间创建一条线，从而解决您的第一个问题。

对于第二个问题，将此代码添加到您的项目中

NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false", saddr, daddr];
    //&alternatives=true

    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];

    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl];

    SBJsonParser *jsonParser = [SBJsonParser new];
    NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:apiResponse error:nil];

    NSLog(@"apiResponse is : %@",jsonData);

    //to display route in drop down

    NSArray *routeArray = [[NSArray alloc]init];
    routeArray= [jsonData objectForKey:@"routes"];

    for(int i=0;i<[routeArray count];i++)
    {
        NSDictionary *tempDictionary = [routeArray objectAtIndex:i];
        if([tempDictionary objectForKey:@"overview_polyline"]!=nil)
        {
            NSDictionary *secTempDictionary = [tempDictionary objectForKey:@"overview_polyline"];
            if([secTempDictionary objectForKey:@"points"]!=nil)
            {
                NSString * routePoint =[secTempDictionary objectForKey:@"points"];

                [routeSetAry addObject:routePoint];

                encodedPoints = [secTempDictionary objectForKey:@"points"];
            }
            // NSLog(@"secTempDictionary is: %@", secTempDictionary);
        } 
        if([tempDictionary objectForKey:@"legs"]!=nil)
        {
            NSArray *lagArray = [[NSArray alloc]init];
            lagArray= [tempDictionary objectForKey:@"legs"];

            for(int i=0;i<[lagArray count];i++)
            {
                NSDictionary *thirdTempDictionary = [lagArray objectAtIndex:i];
                if([thirdTempDictionary objectForKey:@"steps"]!=nil)
                {
                    NSArray *stepsArray = [[NSArray alloc]init];
                    stepsArray= [thirdTempDictionary objectForKey:@"steps"];

                    for(int i=0;i<[stepsArray count];i++)
                    {
                        NSDictionary *forthTempDictionary = [stepsArray objectAtIndex:i];

                        if([forthTempDictionary objectForKey:@"html_instructions"]!=nil)
                        {
                            NSString * directionStr =[forthTempDictionary objectForKey:@"html_instructions"];

                            NSRange range;
                            while ((range = [directionStr rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound){
                                directionStr=[directionStr stringByReplacingCharactersInRange:range withString:@""];
                            }
                            [directionStrAry addObject:directionStr];
                        }

                        NSDictionary *fifthTempDictionary = [forthTempDictionary objectForKey:@"polyline"];
                        if([fifthTempDictionary objectForKey:@"points"]!=nil)
                        {
                            NSString * routePoint =[fifthTempDictionary objectForKey:@"points"];

                            [polylineSetAry addObject:routePoint];

                           // encodedPoints = [fifthTempDictionary objectForKey:@"points"];
                        }
                        NSDictionary *sixthTempDictionary =[forthTempDictionary objectForKey:@"distance"];
                        if([sixthTempDictionary objectForKey:@"text"]!=nil)
                        {
                            NSString * distanceStr =[sixthTempDictionary objectForKey:@"text"];

                            [distanceStrAry addObject:distanceStr];

                            // encodedPoints = [fifthTempDictionary objectForKey:@"points"];
                        } 
                    }
                }
            }
        }  
    }

    NSLog(@"routeSetAry is :%@",routeSetAry);
 NSLog(@"polylineSetAry is : %i",polylineSetAry.count);

这将为您提供方向字符串数组，您可以使用此字符串显示项目中的任何位置。

在我的项目中，我创建了一个显示在 map 顶部的小 View ，在该 View 中我正在一个一个地显示方向。

关于ios - 谷歌地图方向作为 iPhone 上的 map ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14684512/