ios - 如何在 iphone 中解析来自谷歌地图的谷歌方向 api 数据？

Question

我使用代码从 google direction api 解析坐标和折线:

-(void)routeParser:(NSString *)sourceAddress andDestination:(NSString *)destinationAddress{
    NSLog(@"des sour %@",sourceAddress);
    NSError *error = nil;

    NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false", sourceAddress, destinationAddress];
    //&alternatives=true
    NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];
    NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSASCIIStringEncoding error:&error];
    NSLog(@"apiResponse %@",apiResponse);
    SBJsonParser *jsonParser = [SBJsonParser new];
    NSDictionary *jsonData = (NSDictionary *) [jsonParser objectWithString:apiResponse];
    NSLog(@"apiResponse is : %@",[jsonData objectForKey:@"routes"]);
    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);

}

但问题是它记录 null 并在开始时返回 null apiResponse。我不明白我的错在哪里，有人帮忙吗？

Answer 1

- (void) getRoute
{
     polyline.map = nil;
     [googleMapView clear];
     NSString *strUrl = [NSString   stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?&alternatives=true&origin=%@&destination=%@&key=%@&sensor=false",self.sourceText.text,self.destnText.text,googleAPI_Key];

     [self routeDataUrl1:strUrl];
     [self.view addSubview:self.getInfo];
     [self.view addSubview:customIndicatorView]; 
}

-(void) connectionDidFinishLoading:(NSURLConnection *)connection
{
     if (webData) //webData is object of NSData
     {
         [self gettingData:webData ]; //calling the method gettingData
     }

     [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
     webData=nil;
}

//after that gettingData method

- (void) gettingData:(NSData *)data
{

    NSDictionary *allDataDictionary = [NSJSONSerialization 
                                  JSONObjectWithData:data options:0 
                                  error:nil];

    if ([[NSString stringWithFormat:@"%@",[allDataDictionary objectForKey 
    : @"status"]] isEqualToString: @"OK"]) 

    {

        collectionArray =[[NSMutableArray alloc]init];
        NSMutableArray *legsArray = [[NSMutableArray alloc] initWithArray:allDataDictionary[@"routes"]];


        for (int i=0; i< [legsArray count]; i++)
        {

            [collectionArray addObject:[NSDictionary dictionaryWithObjectsAndKeys:legsArray[i][@"legs"][0][@"distance"][@"text"],@"Distance", legsArray[i][@"legs"][0][@"duration"][@"text"],@"Duration",legsArray [i][@"summary"],@"Address",legsArray[i][@"legs"][0][@"summary"][@"html_instructions"][@"text"],@"HtmlInstructions",legsArray[i][@"overview_polyline"][@"points"],@"OverviewPolyline", nil]];
            [polyLineArray addObject:legsArray[i][@"legs"][0][@"steps"]];
            NSLog(@"11 == %@",legsArray[i][@"legs"][0][@"steps"]);         
        }    
        [self.getInfo reloadData];  //where getInfo is the TableView
    }
    else
    {
        NSString *msg=[allDataDictionary objectForKey:@"error_message"];
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Error !" message:msg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];

        [alert show];
    }
}

希望这对你有帮助...